Journal metrics

Journal metrics

  • IF value: 3.248 IF 3.248
  • IF 5-year value: 3.650 IF 5-year 3.650
  • CiteScore value: 3.37 CiteScore 3.37
  • SNIP value: 1.253 SNIP 1.253
  • SJR value: 1.869 SJR 1.869
  • IPP value: 3.29 IPP 3.29
  • h5-index value: 47 h5-index 47
  • Scimago H index value: 60 Scimago H index 60

Scheduled special issues

The following special issues are scheduled for publication in AMT:

New observations and related modelling studies of the aerosol–cloud–climate system in the Southeast Atlantic and southern Africa regions (ACP/AMT inter-journal SI)
21 Jun 2018–31 May 2022 | Guest editors: J. M. Haywood, P. Zuidema, J. Schwarz, J. Riedi, M. Wendisch, P. Knippertz, and F. Eckardt | Information

The purpose of this special issue is the compilation of modelling and observational studies in connection with five international field deployments (AEROCLO-sA, CLARIFY, LASIC, ORACLES, and NaFoLiCA) that focus on the interactions of natural and anthropogenic aerosols with radiation, clouds, and regional climate in the South Atlantic Ocean and the southern African region. These deployments, based in Namibia, Ascension Island, and São Tomé, took place between 2016 and 2018 and support a significant number of investigations extending beyond just the individual science teams. The airborne and ground-based observations, as well as the related satellite measurements and climate modelling studies, address all aspects of aerosol–cloud–climate interactions, including the link of aerosol properties to meteorological fields and dynamical processes that influence aerosol emission and transport. The projects also target the advancement of remote sensing of aerosols for complex scenes over land, sea, and clouds. The special issue will be open to all submissions, with complementary goals to the five mentioned deployments, so as to encourage the exchange of ideas from inside and outside the science teams of all projects.

Fifth International Workshop on Ice Nucleation (FIN) (ACP/AMT inter-journal SI)
13 Jun 2018–31 Aug 2019 | Guest editors: A. K. Bertram, M. Krämer, B. Ervens, and D. Knopf | Information

We conducted the Fifth International Workshop on Ice Nucleation (FIN) to (1) understand the microphysics of how particles nucleate ice, (2) determine the number of ice forming particles as a function of atmospheric properties such as temperature and relative humidity, (3) measure the atmospheric distribution of ice forming particles and (4) ascertain the role of anthropogenic activities in producing or changing the behaviour of ice forming particles. To accomplish these goals we held three distinct workshops on the topic of atmospheric ice nucleation. The first was an intercomparison of instruments to determine the composition of ice forming particles in a controlled laboratory setting. This took place in autumn 2014 at the location of the last ice nucleation instrument intercomparison: the Aerosol Interaction and Dynamics in the Atmosphere (AIDA) chamber located at the Karlsruhe Institute of Technology. The second was an intercomparison of instruments used to determine cloud formation conditions. This activity also took place at AIDA and was conducted in spring 2015. Because ice nucleation predominantly takes place at the low temperatures found at high altitude, a critical requirement for the third workshop was a facility that offers access to free-tropospheric air masses with minimal local particle sources. We used the Desert Research Institute’s recently renovated Storm Peak Laboratory for this workshop in autumn 2015.

Advances in cavity-based techniques for measurements of atmospheric aerosol and trace gases
25 May 2018–01 Nov 2018 | Guest editors: K. Manfred, P. Xie, W. Chen, D. S. Venables, and T. Hanisco | Information

This special issue aims to highlight advances in spectroscopic techniques for applications in atmospheric science. It will highlight cutting-edge measurements of atmospherically relevant species, including aerosol, isotopologues, and trace gases, using optical cavity-based techniques. Such techniques can include cavity-enhanced methods for sensitive absorption and extinction measurements as well as advances in frequency comb techniques. Techniques based on both broadband and laser sources from the ultraviolet to infrared will be considered. Papers based on both laboratory and field measurements are welcome.

Arctic mixed-phase clouds as studied during the ACLOUD/PASCAL campaigns in the framework of (AC)3
09 May 2018–31 Dec 2019 | Guest editors: J. Curtius, J. Kay, M. Shupe, J. Heintzenberg, A. Solomon, T. Vihma, V. Walden, and K. Law | Information

In this special issue papers resulting from two major combined field campaigns shall be aggregated: (i) the Arctic CLoud Observations Using airborne measurements during polar Day (ACLOUD), and (ii) the Physical feedbacks of Arctic boundary layer, Sea ice, Cloud and AerosoL (PASCAL). These two concurrent campaigns took place in the vicinity of Svalbard in May and June 2017. They were designed to study processes important for explaining Arctic amplification, and, in particular, for investigating the role of microphysical and dynamical properties of Arctic low- and mid-level, mixed-phase clouds, and their interactions with atmospheric radiation and aerosol particles. Ground-based, ship-borne, tethered balloon, aircraft, and satellite observations have been combined. The research vessel (RV) Polarstern, an ice floe camp (erected close to the icebreaker) including an instrumented tethered balloon, and the two research aircraft, Polar 5 and Polar 6, were jointly operated. Polar 5 served as a mobile remote sensing observatory looking at the clouds from above, whereas Polar 6 operated as a flying in situ measurement laboratory mostly sampling inside the clouds. The permanent ground station of Ny-Ålesund observed the clouds from below, applying similar but upward-looking remote sensing equipment as Polar 5. Some of the flights were performed underneath respective satellite tracks. In this special issue we compile a number of papers reporting about the results of the observations conducted during ACLOUD/PASCAL within the framework of the (AC)3 project (

Hydrological cycle in the Mediterranean (ACP/AMT/GMD/HESS/NHESS/OS inter-journal SI)
01 Apr 2018–31 Dec 2021 | Guest editors: D. Cimini, G. T. Aronica, C. Barthlott, V. Kotroni, E. Martin, M. Meier, R. Moussa, K. Schroeder, H. Wernli, and V. Ducrocq | Information

The Hydrological cycle in the Mediterranean Experiment (HyMeX, programme is a 10-year concerted effort at the international level started in 2010 with aims to advance the understanding of the water cycle, and with emphases on the predictability and evolution of high-impact weather events, as well as on evaluating social vulnerability to these extreme events. The special issue is jointly organized between the Atmospheric Chemistry and Physics, Hydrology and Earth System Sciences, Ocean Science, Natural Hazards and Earth System Sciences, Atmospheric Measurement Techniques, and Geoscientific Model Development journals. It aims at gathering contributions to the areas of understanding, modelling, and predicting at various timescales and spatial scales of the Mediterranean water cycle and its related extreme events, including cyclones, heavy precipitation, flash floods and impacts, drought and water resources, strong winds, and dense water formation. The special issue is not limited to studies conducted within HyMeX: any multiscale or multidisciplinary approaches related to the Mediterranean water cycle are encouraged.

The CERN CLOUD experiment (ACP/AMT inter-journal SI)
20 Jun 2011–31 Aug 2019 | Guest editors: V.-M. Kerminen, J. H. Seinfeld, N. M. Donahue, K. S. Carslaw, and J. Abbatt | Information

The SI will include papers on the experimental, theoretical and modelling results related to the CERN CLOUD experiment. The scientific focus of the experiment is to make fundamental measurements of aerosol nucleation under highly controlled laboratory conditions, including the effects of natural and synthetic cosmic rays. There were two campaigns of a month long: the first (2010) focused on inorganic aerosols and cosmic ray influences (NH3/H2SO4). The second campaign (June 2011) focuses on organic impacts on nucleation. There are also detailed modelling studies, plus papers on parameterisation development and global model applications.

Holistic Analysis of Aerosol in Littoral Environments – A Multidisciplinary University Research Initiative (ACP/AMT inter-journal SI)
12 Feb 2018–01 Sep 2018 | Guest editors: A. Bucholtz | Information

The Holistic Analysis of Aerosols in Littoral Environments Multidisciplinary University Research Initiative (HAALE-MURI) ACP/AMT special issue aims to advance our understanding and ability to observe and predict the complex distribution and properties of aerosol in the coastal zones. Specific foci of this ongoing 5-year (2015–2020) project are (1) the relative roles and interactions of key environmental factors influencing aerosol distributions impacting electro-optical propagation, (2) methods of characterizing the littoral zone aerosol distribution and properties via next-generation satellite observations and algorithms, and (3) how state-of-the-art data assimilation and visualization methods can exploit this information to provide representative high-resolution quantitative and qualitative analyses. This special issue will highlight progress made on these fronts at the mid-term of this project, showing examples of how traditionally disparate disciplines can provide deeper insight when considered in synergy.

Greenhouse gAs Uk and Global Emissions (GAUGE) project (ACP/AMT inter-journal SI) 17 Jan 2018–30 Sep 2018 | Guest editor: D. Brunner | Information

The special issue collects together publications arising from the NERC-funded (grant no. NE/K002449/1) Greenhouse gAs Uk and Global Emissions (GAUGE) project. GAUGE was designed to quantify nationwide greenhouse gas emissions of the UK (CO2, CH4, and N2O), bringing together a range of measurements and atmospheric transport models. GAUGE will inform the blueprint for countries that are building a measurement infrastructure in preparation for global stocktakes that are a key part of the Paris Agreement.

Layered phenomena in the mesopause region (ACP/AMT inter-journal SI) 01 Jan 2018–30 Sep 2018 | Guest editors: W. Ward, B. Funke, and R. E. Hibbins | Information

This is also the title of a well-established science meeting which we hosted at IAP on 18–22 September 2017. Special issues from former LPMR meetings were mainly published in JASTP, but for various reasons we prefer ACP this time. The special issue arises from the LPMR meeting, but it should be open for all submissions within its scope. The main science topics covered during the LPMR meeting are as follows: 1. Mesospheric phenomena and related sciences, including noctilucent clouds (NLCs), polar mesospheric clouds (PMCs), and polar mesospheric summer echoes (PMSEs). Measurements of these ice layers and related parameters by modern technologies such as lidars, radars, imagers, interferometers, spectrometers, rocket-borne sensors, and satellite-borne instruments, e.g. on AIM. 2. Long-term trends and solar-cycle-induced variations of layered phenomena and the role of these ice layers in the study of climate change in the middle atmosphere. 3. Neutral and ionized metal layers of meteoric origin and related parameters such as cosmic dust, meteors, meteoroids, meteorites, and ablation physics. 4. The physics and application of airglow to study the thermal and dynamical structure in the mesopause region. 5. Using layered phenomena in the mesopause region as tracers to study gravity waves and turbulence. 6. Related atmospheric phenomena such as ionospheric layers and dynamic coupling between atmospheric layers.

Flow in complex terrain: the Perdigão campaigns (WES/ACP/AMT inter-journal special issue) 17 Aug 2017–31 Dec 2018 | Guest editors: L. Bianco, J. Laginha Palma, and S. Oncley | Information

The Perdigão field campaigns probed atmospheric flow in and around a double-ridge valley in Portugal equipped with one turbine, collecting data critical for improving fundamental insights into flow in complex terrain as well as methods for quantifying wind resources. While the Perdigão 2015 campaign pioneered coordinated scans from three scanning lidars, Perdigão 2017 included an unprecedented array of instrumentation, including 30 scanning and profiling lidars to map the valley's atmosphere. An array of approximately 50 towers, equipped with sonic anemometers and ranging in height from 10 to 100 m, provided in situ measurements to measure air flow and turbulence. Radiosondes, thermistor arrays, microwave radiometers, and an Atmospheric Emitted Radiance Interferometer (AERI) measure temperature structure. Acoustic measurements, seismographic measurements, and tethered systems measuring high-rate turbulence data also provide unique insights into the numerous flow phenomena observed in the valley.

In addition to studying complex terrain effects on the wind resource and wind turbine wakes, the Perdigão data enable insights into interactions between flows of different scales, effects of topographic and diurnal thermal forcing, valley/slope boundary layers, and recirculations within the valley.

This special issue is open for all submissions within its scope, addressing measurements, simulations, and case studies from both Perdigão field campaigns.

The 10th International Carbon Dioxide Conference (ICDC10) and the 19th WMO/IAEA Meeting on Carbon Dioxide, other Greenhouse Gases and Related Measurement Techniques (GGMT-2017) (AMT/ACP/BG/CP/ESD inter-journal SI) 01 Oct 2017–31 Mar 2019 | Guest editors: B. Buchmann, M. Leuenberger, M. Steinbacher, C. Zellweger, and H. Fischer | Information

The International Carbon Dioxide Conference (ICDC) is the single largest conference organized by the global research community every four years to present the latest scientific findings on the science of the carbon cycle and its perturbation by human activities. The ICDC10 in 2017 is the 10th anniversary conference. It covers fundamental science advancement and discovery, the generation of policy relevant information, and observational and modeling approaches. ICDC10 brings together scientists from different disciplines to work towards an integrated view on the global cycle of carbon in the Earth system.

The main themes of the conference are as follows:

  1. The contemporary carbon cycle
    • Trends, variability, and time of emergence of human impacts
    • Emerging approaches and novel techniques in observations
  2. The paleo-perspective: patterns, processes, and planetary bounds
  3. Biogeochemical processes
    • Process understanding and human impacts
    • Coping with complexity: from process understanding to robust models
  4. Scenarios of the future Earth and steps toward long-term Earth system stability

GGMT-2017 is a key conference on measurement techniques for accurate observation of long- lived greenhouse and related gases, their isotopic composition in the atmosphere relevant for climate change, and global warming research findings. The biannual meeting, known as the WMO/IAEA Meeting of Experts on Carbon Dioxide, Other Greenhouse Gases and Related Tracer Measurement Techniques, is to be held for the 19th time in 2017.

Main topics:

  • Developments of the GHG networks
  • CO2 observations (measurement techniques and calibration)
  • Non-CO2 observations (measurement techniques and calibration)
  • Isotope measurement and calibration
  • Emerging techniques
  • GHG standards and comparison activities
  • Integration of observations, data products and policy

The special issue is open for papers that emerged from ICDC10 and GGMT-2017 conference contributions.

In-depth study of air pollution sources and processes within Beijing and its surrounding region (APHH-Beijing) (ACP/AMT inter-journal SI) 01 Oct 2017–30 Sep 2020 | Guest editors: P. Q. Fu, M. Zheng, J. Allan, L. K. Whalley, Li Yongjie, D. K. Farmer, J. Stutz, T. Butler, and F. N. Keutsch | Information

The air pollution problems affecting Beijing and north-eastern China are well documented, but the formulation of cost-effective solutions requires further research. In a study funded by the UK Natural Environment Research Council and Medical Research Council and the Chinese Natural Science Funding Council, researchers from the UK and China have collaborated in studies with the following aims:

  • to determine the emission fluxes of key pollutants and to measure the contributions of different sources, economic sectors and regional transport to air pollution in Beijing;
  • to assess the processes by which pollutants are transformed or removed through transport, chemical reactions and photolysis and the rates of formation and conversion of particulate matter via atmospheric reactions;
  • quantify how the detailed properties of particulate matter evolve and can influence its physical properties and behaviour in the atmosphere and elucidate the mechanisms whereby these properties may interact and feed back on urban-scale and regional meteorology;
  • to develop numerical models capable of reliably simulating air quality within Beijing and its local region and prediction of the impacts of mitigation measures;
  • to determine exposure of Beijing inhabitants to key health-related pollutants using personal air pollution monitors and assess the associated links between air pollution exposure and health impacts;
  • to determine the contribution of specific activities, environments and pollution sources to the personal exposure of the Beijing population to air pollutants derived from outdoor sources.

Implementation of the research was through two major field campaigns based in Beijing and rural sites outside of the city which took place in November–December 2016 and May–June 2017. The work involved measurements of air pollutants as well as key precursors, reactive species and meteorological variables in three spatial dimensions, with a view to creating an enhanced understanding of the processes determining pollutant concentrations, especially in relation to particulate matter and photo-oxidants.

Towards Unified Error Reporting (TUNER) 01 Sep 2017–31 Aug 2020 | Guest editors: T. von Clarmann, D. Degenstein, N. Livesey, and H. Worden | Information

Towards UNified Error Reporting (TUNER) is an emerging SPARC activity and an ISSI International Team. This project aims to provide consistent and inter-comparable error estimates for atmospheric temperature and composition measurements from space. Along with this, a consistent and inter-comparable characterization of spatial resolution and content of a priori information of the remotely sensed data shall be provided. This is important, because quantitative work with remotely sensed data – data assimilation, data merging, time series analysis, testing of hypotheses, etc. – depends largely on the adequate characterization of the data. Currently, multiple retrieval methods are used by the different instrument groups, and along with this various approaches to error estimation are applied. Resulting errors are not always inter-comparable. Some kinds of uncertainties are sometimes not reported at all. The different altitude resolutions and the different content of prior information in the data products are a particular problem. Within TUNER, data characterization methods currently in use are identified, their completeness and inter-comparability are assessed, recommendations for how unified data characterization should be performed and how data uncertainties should be reported are developed, and unified error estimates for some selected data products are provided. Beyond this, data users are instructed how to best utilize these metadata.

This special issue is meant to include papers covering one of the following topics:

  • methodical work related to the uncertainty assessment of satellite data on atmospheric temperature and composition;
  • the error budget of satellite-borne atmospheric sounders;
  • the use of results of validation studies to judge the adequacy of uncertainty estimates;
  • recommendations for unified error estimates;
  • tutorial articles on the correct use of error estimates and other diagnostic data and related topics.

This special issue is open to contributions from outside the related SPARC and ISSI TUNER teams, provided that the content fits within the scope of TUNER. Further details are available at

Results of the project "Dynamics-aerosol-chemistry-cloud interactions in West Africa" (DACCIWA) (ACP/AMT inter-journal SI) 26 Jun 2017–31 Aug 2018 | Guest editors: M. J. Evans, S. Janicot, A. Mekonnen, S. van den Heever, and E. C. Apel | Information

DACCIWA was a large multi-national (Germany: KIT, DLR; France: CNRS, Université Blaise Pascal Clemont-Ferrand II, Université Paris Didertot, Université Paul Sabatier Toulouse III, Université Pierre et Marie Curie; UK: Met Office, University of Manchester, University of Leeds, University of York, University of Reading; Switzerland: ETH Zürich; European: ECMWF; Ghana: KNUST; Nigeria: Obafemi Awolowo University) project funded by the European Union 7th Framework Programme to investigate atmospheric processes over West Africa, ranging from the impact of air pollution on atmospheric health to the future climate of the region. Arranged around seven interlinking work packages (WP1: boundary layer dynamics; WP2: air pollution and health; WP3: atmospheric chemistry; WP4: cloud-aerosol interactions; WP5: radiative processes; WP6: radiative processes; WP7: precipitative processes; WP7: monsoon processes), the project aims to improve our scientific understanding of this region and its resilience through increased scientific understanding of key atmospheric processes.

The summer of 2016 was the focal point for the experimental activities. Highly instrumented supersites at Savé in Benin and Kumai in Ghana provided multi-week analysis of a range of meteorological parameters and targeted cloud formation, low-level jet activation, and precipitation formation. Meteorological sondes were released at regular intervals and as special observing periods from a range of cities in the region. Air quality measurements in the cities of Cotonou, Abidjan, and Akouedou provided information on pollution loads in regional cities and emission factors for emission estimates. Three research aircraft (DLR Falcon, BAS Twin Otter, SAPHIRE ATR43) were based in Lomé, Togo, for a month to make a range of observations over the coastal cities of Ivory Coast, Ghana, Togo, and Benin and inland over the rainforest, agricultural, and residential areas. The aircraft were equipped to measure a range of gas, aerosol, and meteorological parameters. A more complete list of payloads, observations collected, flight paths flown, etc. is attached as a PDF, which forms part of a paper currently being reviewed by BAMS that describes the summer campaign.

The intention of the scale issue is to bring together all of this activity into a single area to allow synergies between the papers to be more evident and to help advertise the data and science generated by the DACCIWA project in this data-poor area to the wider community.

The Polar Stratosphere in a Changing Climate (POLSTRACC) (ACP/AMT inter-journal SI) 21 Jun 2017–30 Jun 2018 | Guest editors: B.-M. Sinnhuber, H. Oelhaf, and R. Schofield | Information

The special issue invites contributions based on the aircraft campaign "The Polar Stratosphere in a Changing Climate (POLSTRACC)" that took place in the Arctic in winter 2015/16 ( but is intended to be open for submissions related to the topic of the polar stratosphere in a changing climate in a broader sense.

BACCHUS – Impact of Biogenic versus Anthropogenic emissions on Clouds and Climate: towards a Holistic UnderStanding (ACP/AMT/GMD inter-journal SI) 14 Jun 2017–31 Dec 2018 | Guest editors: J. Abbatt and J. Schneider | Information

BACCHUS is a European FP7 Collaborative Project aiming at quantifying key processes and feedbacks that control aerosol–cloud interactions by combining advanced measurement techniques of cloud and aerosol properties with emphasis on ice nucleating particles and the ice phase in clouds with state-of-the-art numerical modelling. It investigates the importance of biogenic versus anthropogenic emissions for aerosol–cloud interactions in regions that are key regulators of Earth's climate (Amazonian rainforest) or are regarded as tipping elements in the climate system (Arctic). BACCHUS advances the understanding of biosphere aerosol–cloud–climate feedbacks that occur via emission and transformation of biogenic volatile organic compounds, primary biological aerosols, secondary organic aerosols, and dust. New fundamental understanding gained during BACCHUS will be incorporated into Earth system models through new or improved parameterizations of emissions, aerosol and cloud processes, and properties, which will lead to a reduction in the uncertainty of future climate projections. A unique database linking long-term observations and field campaign data of ice nucleating particles and observed cloud microphysical properties has been generated.

The BACCHUS special issue will be simultaneously presented in the ACP, AMT, and GMD journals and is open for all submissions acknowledging the BACCHUS project. BACCHUS is a collaborative project of 21 partner institutions: ETH Zurich, University of Helsinki, Paul Scherrer Institute, Max Planck Society (MPI-M, MPI-C), University of Oxford, University of Oslo, Finnish Meteorological Institute, University of Leeds, University of Manchester, Leibniz Institute for Tropospheric Research, Goethe University Frankfurt, the University of Crete, National Research Council of Italy – Institute of Atmospheric Sciences and Climate, National University of Ireland Galway, Institute for Nuclear Research and Nuclear Energy, Hebrew University of Jerusalem, National Center for Scientific Research (France), Karlsruhe Institute of Technology, Cyprus Institute, Cyprus University of Technology, and University of Gothenburg. The project is funded by the European Union's Seventh Framework Programme (FP7/2007-2013) under grant agreement no. 603445.

CALIPSO version 4 algorithms and data products 01 Jun 2017–30 Sep 2018 | Guest editors: V. Amiridis, J. Reagan, J. R. Campbell, and C. Trepte | Information

The Cloud Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) project released version 4.1 (V4.1) of the CALIPSO lidar data products in November 2016. The papers in this special issue of Atmospheric Measurement Techniques will describe all aspects of the new and updated algorithms used to generate the V4.1 data products and will compare the V4.1 retrievals of the spatial and optical properties of clouds and aerosols to results produced by earlier releases. Submissions to this special issue are limited to invited papers written by members of the CALIPSO lidar science working group.

SKYNET – the international network for aerosol, clouds, and solar radiation studies and their applications (AMT/ACP inter-journal SI) 01 Sep 2016–indefinite | Guest editors: O. Torres, T. Nakajima, S. Kazadzis, and M. Campanelli | Information

SKYNET is an international research network dedicated to aerosol—cloud—radiation interaction studies. It consists of about 60 sites located all over the world. The main instrument at each site is the sun—sky radiometer, but to strengthen the ability of SKYNET, simultaneous measurements with other instruments such as pyranometers, pirgeometers, microwave radiometers, absorption meters, cloud cameras, lidars, MAX-DOAS, and instrumentation for in situ characterisation are also conducted for some selected sites. This special issue will face issues related to the following topics: aerosol and cloud properties from radiometers; developments on instrumentation; aerosol radiative forcing and climate effects; intercomparison among radiometer networks; validation of aerosol and cloud properties from satellite and models; applications for air pollution studies; and applications for solar energy.

Atmospheric emissions from oil sands development and their transport, transformation and deposition (ACP/AMT inter-journal SI) 22 Apr 2016–15 Mar 2018 | Guest editors: R. Martin, J. Brook, and S.-M. Li | Information

The oil sands of Alberta, Canada, are of international interest due to the potential environmental impacts, from local to global scales, of their extraction and processing to provide non-conventional fossil fuels to consumers in North America and globally. The governments of Canada and the province of Alberta launched the Joint Oil Sands Monitoring (JOSM) program in 2012 to help address knowledge gaps regarding long-term cumulative effects of oil sands' development and production. JOSM is a regionally focused program; however, the knowledge gained is applicable to extra heavy oil production elsewhere, given the large known global reserves of heavy oil and bitumen.

The purpose of this special issue is to bring together the scientific results of atmospheric-related JOSM studies, which have been largely conducted since 2013, although some of the potential papers could involve data obtained in earlier years. Other submissions within this scope could also be considered. The results would be derived from measurements from the ground as well as aircraft and satellite overpasses. Applications and evaluations of high-resolution modeling will also be part of this research portfolio. While the studies are to be focused on emissions and ambient levels, as well as deposition, with regard to the oil sands region in Alberta, and therefore referring particularly to conditions in that area, results will have a broader relevance scientifically. This ranges from evaluation of new satellite retrievals, new trace gas and aerosol measurement methods and techniques for source apportionment and emission inventory evaluation, to process studies of deposition, secondary air pollutant formation (gas and particle) and black carbon coating and light absorption.

The 10th International Carbon Dioxide Conference (ICDC10) and the 19th WMO/IAEA Meeting on Carbon Dioxide, other Greenhouse Gases and Related Measurement Techniques (GGMT-2017) (ACP/AMT/CP/ESD inter-journal SI) 01 Oct 2017–30 Sep 2018 | Guest editors: B. Buchmann, N. Gruber, M. Leuenberger, C. LeQuere, J. Pongratz, C. Prentice, J. Randerson, M. Steinbacher, and C. Zellweger | Information

The International Carbon Dioxide Conference (ICDC) is the single largest conference organized by the global research community every four years to present the latest scientific findings on the science of the carbon cycle and its perturbation by human activities. The ICDC10 in 2017 is the 10th anniversary conference. It covers fundamental science advancement and discovery, the generation of policy relevant information, and observational and modeling approaches. ICDC10 brings together scientists from different disciplines to work towards an integrated view on the global cycle of carbon in the Earth system.

The main themes of the conference are as follows:

  1. The contemporary carbon cycle
    • Trends, variability, and time of emergence of human impacts
    • Emerging approaches and novel techniques in observations
  2. The paleo-perspective: patterns, processes, and planetary bounds
  3. Biogeochemical processes
    • Process understanding and human impacts
    • Coping with complexity: from process understanding to robust models
  4. Scenarios of the future Earth and steps toward long-term Earth system stability

GGMT-2017 is a key conference on measurement techniques for accurate observation of long- lived greenhouse and related gases, their isotopic composition in the atmosphere relevant for climate change, and global warming research findings. The biannual meeting, known as the WMO/IAEA Meeting of Experts on Carbon Dioxide, Other Greenhouse Gases and Related Tracer Measurement Techniques, is to be held for the 19th time in 2017.

Main topics:

  • Developments of the GHG networks
  • CO2 observations (measurement techniques and calibration)
  • Non-CO2 observations (measurement techniques and calibration)
  • Isotope measurement and calibration
  • Emerging techniques
  • GHG standards and comparison activities
  • Integration of observations, data products and policy

The special issue is open for papers that emerged from ICDC10 and GGMT -2017 conference contributions.

NETCARE (Network on Aerosols and Climate: Addressing Key Uncertainties in Remote Canadian Environments) (ACP/AMT/BG inter-journal SI) 23 Feb 2016–28 Feb 2019 | Guest editors: L. Bopp, K. Carslaw, D. J. Cziczo, and L. M. Russell | Information

NETCARE (Network on Aerosols and Climate: Addressing Key Uncertainties in Remote Canadian Environments) is a large research network focusing on aerosol–cloud–climate interactions. While Canadian-based, it operates with many international collaborations. It is comprised of scientists working in both atmospheric science and marine biogeochemistry, with particular attention given to a suite of intensive field measurements (with both atmospheric and oceanic components) and model evaluation and development. There are three major research directions within the network: 1. Carbonaceous Aerosol, 2. Arctic Clouds, and 3. Ocean–Atmosphere Interactions. A large amount of the research has an Arctic focus, it being a region especially susceptible to anthropogenic input and experiencing a large degree of biogeochemical change. The website for the network is On the website, there is more information on research activities, field campaign details, modeling activities, data products, and personnel.

Water vapour in the upper troposphere and middle atmosphere: a WCRP/SPARC satellite data quality assessment including biases, variability, and drifts (ACP/AMT/ESSD inter-journal SI) 10 Feb 2016–01 Apr 2018 | Guest editors: J. Russell, K. Rosenlof, S. Buehler, and G. Stiller | Information

The Water Vapour Phase II (WAVAS II), a SPARC activity, started in 2008 (SPARC Newsletter No. 30 (2008) p. 16: SPARC Water Vapour Initiative, by C. Schiller et al.). The activity includes satellite assessment and in situ comparison components. This international activity encompasses:

  1. Providing a quality assessment of upper tropospheric to lower mesospheric satellite records since the early 1990s
  2. Providing, as far as possible, absolute validation against ground-truth instruments
  3. Assessing inter-instrument biases, depending on altitude, location, and season
  4. Assessing the representation of temporal variations on various scales
  5. Including data records on isotopologues
  6. Providing recommendations for usage of available data records and for future observation systems

The main objective of WAVAS II is to assess and extend our knowledge and understanding of measurements of the vertical distribution of water vapor in the upper troposphere and middle atmosphere (UT/MA), where water has small concentrations, but significant radiative impact. This is a follow-up of the SPARC WAVAS activity, whose report was published in 2000 (SPARC Report No. 2 (2000) Upper Tropospheric and Stratospheric Water Vapour. D. Kley, J.M. Russell III, and C. Philips (eds.). WCRP-113, WMO/TD - No. 1043). Information gained from this activity will improve our ability to estimate long-term changes with associated uncertainties in UT/MA water as well as make recommendations as to what data would be most valuable for model validation and how such data should be used. Papers will be accepted for this special issue according to the following guidelines, independent if they originate from the WAVAS II activity or other activities. Guidelines for submissions:

  • papers covering existing UT/MA satellite water vapour measurements;
  • papers discussing comparisons of UT/MA satellite measurements, including discussion of quantities derived from these measurements, such as seasonal cycles, estimates of transport, or estimates of drifts, trends and variability;
  • papers discussing merging of water vapour measurements will be considered, although this topic is not specifically part of the WAVAS-II activity;
  • model papers that incorporate the datasets discussed and the uncertainty estimates resulting from the WAVAS-II activity will also be considered for inclusion.

Study of ozone, aerosols and radiation over the Tibetan Plateau (SOAR-TP) (ACP/AMT inter-journal SI) 31 Oct 2013–31 Dec 2019 | Guest editors: R. Sander, H. Su, T. Wagner, T. Wang, Y. Cheng, X. Xu, W. Tian, and Y. Yin | Information

The Tibetan Plateau, also known in China as the Qinghai-Tibet Plateau, has a large influence on atmospheric circulation, hydrological cycle and climate in East Asia as well as the Northern Hemisphere. The plateau, sometimes called "the Roof of the World" or "the Third Pole", covers a huge area located in 73-105 E longitude and 26-40 N latitude, with mean surface elevation of 4000-5000 m above sea level. It has long been considered as one of the remote regions in the Eurasian continent that are relatively less influenced by pollution from human activities. While natural processes that control the temporal and spatial variations of atmospheric composition over the Tibetan Plateau are still inadequately understood, the influence of long-range transport of pollutants from surrounding areas, e.g. South and Southeast Asia, and farther regions on the background atmosphere of the Tibetan Plateau and associated climate impacts have become a scientific issue to be intensively addressed. Long-term measurements of trace gases, aerosols and radiation have been performed at several remote sites in the Tibetan Plateau region, including e.g. the Waliguan Global Baseline Station and the Shangri-la Regional Background Station (both operated by China Meteorological Administration) and the Nam-Co Comprehensive Observation and Research Station (operated by Institute of Tibetan Plateau Research, Chinese Academy of Sciences). Intensive field campaigns were carried out based on these stations and some other sites of the region during different periods to investigate the levels and variation controlling factors of atmospheric ozone and aerosols over the plateau. Observations include in-situ measurements of ozone and related trace species, in-situ and sampling measurements of aerosol physical properties and chemical composition, sounding of ozone and water vapor, lidar measurements of aerosols, and ground-based remote sensing of selected trace gases, etc. Models are also used to compare with measurement results and interpret data. The purpose of this issue is to expand our understanding of physic-chemical and transport processes that largely influence atmospheric ozone and aerosols as well as radiation over the Tibetan Plateau.

ML-CIRRUS – the airborne experiment on natural cirrus and contrail cirrus in mid-latitudes with the high-altitude long-range research aircraft HALO (ACP/AMT inter-journal SI)
15 Nov 2015–31 Dec 2019 | Guest editors: C. Voigt, E. Jensen, D. Baumgardner, U. Schumann, R.-S. Gao, and O. Möhler | Information

The ML-CIRRUS mission deployed the novel high-altitude long-range research aircraft HALO to get new insights into the nucleation, life cycle and climate impact of natural cirrus and anthropogenic contrail cirrus. The ML-CIRRUS mission with the G5 research aircraft HALO combined an in situ/remote sensing payload including a suite of direct state-of-the-art cloud instruments and a novel aerosol and ice residual, trace gas and radiation instrumentation as well as a high-spectral-resolution water vapor lidar. The aircraft observations were assisted by remote sensing observations from satellite and ground and by numerical simulations to predict cirrus and contrail cirrus occurrence. ML-CIRRUS will provide a comprehensive data set on natural cirrus and aircraft-induced cloudiness for cloud process studies and climatological considerations.

Chemistry–Climate Modelling Initiative (CCMI) (ACP/AMT/ESSD/GMD inter-journal SI) 23 Oct 2015–30 Sep 2018 | Guest editors: B. N. Duncan, A. Gettelman, P. Hess, G. Myhre, and P. Young | Information

IGAC/SPARC CCMI ( consists of a wide range of researchers, including chemistry-climate modelers, observationalists, and data analysts who are investigating the historical and projected evolution of stratospheric and tropospheric composition and chemistry, including the links between those domains, and the feedbacks with the physical climate. A current CCMI activity is a series of hindcast model simulations in support of upcoming ozone and climate assessments. The goal is to quantify how well the models can reproduce the past behavior (climatology, trends and interannual variability) of tropospheric and stratospheric ozone, other oxidants, and more generally chemistry-climate interactions, as well as to understand processes that govern these interactions. An emphasis is placed on observational based evaluation of model output, including model processes. A future CCMI activity will be to analyze projections of the future evolution of tropospheric and stratospheric ozone.

Advanced Global Navigation Satellite Systems tropospheric products for monitoring severe weather events and climate (GNSS4SWEC) (AMT/ACP/ANGEO inter-journal SI) 01 Nov 2015–30 Nov 2018 | Guest editors: D. Feist, J. Jones, S. de Haan, E. Pottiaux, O. Bock, R. Pacione, and R. Van Malderen | Information

Since 1990, signals from global positioning system (GPS) satellites have been recorded by networks worldwide. From these GPS observations the zenith total delay (ZTD) can be computed. Using surface measurements of pressure and temperature, these ZTD values can be turned into water vapour amount and used for atmospheric research. The main aim of the COST action ES1206 “Advanced Global Navigation Satellite Systems tropospheric products for monitoring severe weather events and climate” (GNSS4SWEC) is to coordinate the research and the development of new, advanced tropospheric products derived from GNSS signal delays, exploiting the full potential of multi-GNSS (GPS, GLONASS and Galileo) water vapour estimates on a wide range of temporal and spatial scales, from real-time monitoring and forecasting of severe weather to climate research. The potential impacts of this work are great: improved severe weather forecasting, leading to a decreased risk to life and national infrastructure; improvement of climate projections also has major global significance. In addition the action will promote the use of meteorological data in GNSS positioning, navigation, and timing services. The main topics envisioned in the special issue include the following:

  • The development of advanced and new GNSS tropospheric products related to
    • multi-GNSS constellation signals for water vapour remote sensing,
    • water vapour anisotropy (horizontal gradients, satellite slant delays, tomography, etc.),
    • real-time/ultra-fast water vapour remote sensing in support of nowcasting ,
    • improvement of the temporal and spatial resolution capability of GNSS water vapour remote sensing.
  • The exploitation of these products in numerical weather prediction (NWP) and nowcasting, such as
    • the development of new initialization/assimilation methods in NWP,
    • the development of forecasting tools (water vapour maps, convective indexes, alarm systems, etc.) for nowcasting and severe weather events.
  • The assessment of these GNSS tropospheric products (see first point) derived from a common benchmark reference data set.
  • The assessment of the standardized methods/tools for NWP/nowcasting (see second point) based on the GNSS products built on the benchmark data set.
  • Exploiting re-analysed/reprocessed GNSS tropospheric products for climate studies:
    • comparison/assimilation in the regional/ global climate models,
    • comparisons with other in-situ, ground-based and satellite water vapour retrievals,
    • development and assessment of homogenization methods for GNSS-based product time series,
    • analysing the variability and trends in GNSS-based water vapour retrievals.
  • Establishment of new GNSS analysis centres for monitoring the atmosphere.

Submissions of papers dealing with broader GNSS4SWEC objectives are also encouraged:

  • synergy between GNSS and GNSS radio occultation (RO),
  • monitoring the other components of the hydrological cycle (soil moisture, snow cover, terrestrial water storage) with GNSS.

Observations and Modeling of the Green Ocean Amazon (GoAmazon2014/5) (ACP/AMT/GI/GMD inter-journal SI) 01 Jun 2015–31 May 2020 | Guest editor: A. Wiedensohler | Information

Observations and modelling of the Green Ocean Amazon (GoAmazon2014/5): the GoAmazon2014/5 campaign sought to quantify and understand how aerosol and cloud life cycles in a particularly clean background in the tropics were influenced by pollutant outflow from a large tropical city. The project addressed the susceptibility of cloud–aerosol–precipitation interactions to present-day and future pollution in the tropics. The experiment took place in central Amazonia from 1 January 2014 to 31 December 2015, including intensive operating periods and aircraft in the wet and dry seasons of 2014.

The Saharan Aerosol Long-range Transport and Aerosol-Cloud-interaction Experiment (SALTRACE) (ACP/AMT inter-journal SI) 16 Feb 2015–28 Feb 2018 | Guest editors: B. Weinzierl, U. Wandinger, C. Flamant, C. Hoose, C. Ryder, and J. Schwarz | Information

Wind-borne mineral dust can affect climate through its interaction with radiation and its role in cloud microphysical processes. In spite of this importance, there has been little research on the long-range transport of mineral dust. In particular critical understanding of the transformations of mineral dust during long-range transport including changes in physical and chemical properties of the particles and the roles of various removal processes during transport is lacking. In addition, climate change threatens to change dust emission rates and hence future dust impacts. To investigate the long-range transport of mineral dust from the Sahara into the Caribbean, and to study the impact of aged mineral dust on both the radiation budget and cloud microphysical processes, the Saharan Aerosol Long-range Transport and Aerosol-Cloud-Interaction Experiment (SALTRACE) was conducted in June/July 2013. During SALTRACE, mineral dust from several dust outbreaks was studied under a variety of atmospheric conditions, and a comprehensive data set on chemical, microphysical and optical properties of aged mineral dust was gathered. SALTRACE was a German initiative involving scientists from Europe, Cabo Verde , the Caribbean and the US. It was designed as a closure experiment combining ground-based, airborne, satellite and modelling efforts. Ground-based lidar, in situ aerosol and sun photometer instruments were deployed on Barbados (main SALTRACE super-site), Cabo Verde and Puerto Rico. The DLR research aircraft Falcon carried an extensive suite of in situ and remote-sensing instruments and spent more than 110 flight hours studying the long-range transport of mineral dust between Senegal, Cabo Verde, the Caribbean and Florida. SALTRACE was highly successful and allowed the collection of a unique mineral dust data set which will be presented in this SI, including papers on the experimental, theoretical, and modelling results, as well as instrument and algorithm developments related to the SALTRACE field experiment.

Results from the ice nucleation research unit (INUIT) (ACP/AMT inter-journal SI) 18 Dec 2013–31 Dec 2018 | Guest editors: J. Abbatt, A. Bertram, D. J. Cziczo, B. Ervens | Information

INUIT - Ice Nuclei Research Unit:

Ice crystals play an important role for the radiative properties of clouds as well as for the formation of precipitation. Mixed-phase clouds are clouds that consist of both, super-cooled liquid droplets and ice particles. They account for a large fraction of the clouds in the atmosphere but our knowledge on the microphysical properties of these clouds is still limited. An important question is how ice forms in these clouds. While it is well established that an ice nucleus is needed as a seed for the initial formation of an ice crystal in mixed-phase clouds many questions remain to be answered on the concentration and variability of atmospheric ice nuclei and their physico-chemical properties.

The Research Unit "INUIT" (Ice Nuclei research UnIT) studies heterogeneous ice formation in the atmosphere. The studies include laboratory investigations on the nature of the nucleation process and on the chemical, microphysical and biological characterization of atmospherically relevant ice nuclei as a function of temperature and water saturation. Intensive field experiments are conducted as well as monitoring surveys to study the number concentration, variability, size, chemical composition, surface properties and sources of atmospheric ice nuclei in different freezing modes. Various state-of-the-art methods and facilities are used for the characterization of the ice nuclei. Ice nucleating properties of mineral dust particles, volcanic ash, and biological ice nuclei are a focus of attention of the INUIT research unit. The results of the experimental investigations are fed into a cloud process model and a cloud-resolving meso-scale model to improve the representation of clouds in the models, to simulate cloud processes and to quantify the contribution of ice nuclei types and freezing modes.

The INUIT research unit comprises 9 research projects from 8 partner institutes (Goethe-University of Frankfurt/Main, University of Bielefeld, University of Mainz, Technical University Darmstadt, Leibniz-Institute for Tropospheric Research, Max-Planck Institute for Chemistry and Karlsruhe Institute for Technology). It is funded by the Deutsche Forschungsgemeinschaft DFG (grant no. FOR 1525).

CHemistry and AeRosols Mediterranean EXperiments (ChArMEx) (ACP/AMT inter-journal SI) 14 Oct 2013–31 Dec 2018 | Guest editors: N. Mihalopoulos, W. Lahoz, X. Querol, C. Reeves, F. Dulac, O. Dubovik, J.-L. Attie, M. Beekmann, and E. Gerasopoulos | Information

The Chemistry and Aerosol Mediterranean Experiment (ChArMEx) special issue will be simultaneously presented in the ACP and AMT journals. It aims at gathering experimental and modelling contributions to the field of atmospheric chemistry in the Mediterranean region and its impacts on regional air quality and climate, both in the recent past, present and future decades. It addresses natural and anthropogenic emissions of tropospheric reactive species, source apportionment, chemical transformations, transport processes, atmospheric deposition, aerosol optical properties and interactions with radiation, water vapour and clouds, variability and trends, and future conditions following climate change and increasing anthropogenic pressure. This special issue will be open for submissions until end of July 2016. For more information, please contact Francois Dulac.

VERDI – Vertical Distribution of Ice in Arctic Clouds (ACP/AMT Inter-Journal SI) 01 Dec 2013–31 Dec 2018 | Guest editors: C. Hoose, M. Shupe, and P. Eriksson | Information

The scientific expedition VERDI (short for Vertical Distribution of Ice in Arctic Clouds) is a cooperation project of various German research institutes with the goal to measure the microphysical and optical properties of Arctic boundary-­layer clouds, and to investigate the effects that those clouds can have on the energy budget in the Arctic atmosphere. The VERDI participants have successfully performed airborne measurements of the microphysical and radiative properties of clouds in the Canadian Arctic (based in the town of Inuvik in the Northwest Territories) in April and May 2012, and are now working on the data processing and evaluation. At least seven publications on VERDI results (listed below) are planned, and it is desired to bundle these in the planned ACP/AMT inter-­journal special issue. The special issue is open for all submissions within its scope.

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