Journal cover Journal topic
Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

Scheduled special issues

The following special issues are scheduled for publication in AMT:

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 2017–30 Sep 2018 | 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 http://www.imk-asf.kit.edu/english/304_2689.php.

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 (www.polstracc.kit.edu) 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 2017–31 Dec 2017 | 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.

Sources, propagation, dissipation and impact of gravity waves (ACP/AMT inter-journal SI)
15 Mar 2017–31 Dec 2017 | Guest editors: M. Rapp, J. Gumbel, M. Taylor, and G. Zängl | Information


Gravity waves (GWs) are a ubiquitous phenomenon in a stably stratified atmosphere. GWs are excited by flow over orography and by convection or jet streams and fronts, and may propagate both horizontally and vertically over large distances. Thus, they lead to a significant vertical and horizontal transport of energy and momentum which so far is hardly appropriately accounted for in numerical weather prediction and climate models, which mainly rely on simplified parametrization schemes. In order to investigate sources, propagation, dissipation and impact of GWs, a number of large internationally coordinated research campaigns have been conducted over the past few years. These campaigns involve observations with research aircraft, satellites, research balloons, and ground-based instruments, as well as related modelling efforts. Specifically, these are the series of GW-LCYCLE (Gravity Wave Life CYCLE) campaigns conducted in northern Scandinavia in winter 2013 and 2015/16 as well as the NSF-DEEPWAVE (The DEEP PROPAGATING GRAVITY WAVE EXPERIMENT) campaign conducted in June/July 2014 from New Zealand. The German contributions to these activities were funded in the scope of the ROMIC (Role of the Middle atmosphere in Climate) research focus of the German Ministry for Education and Research as well as the MS-GWAVES (Multi Scale dynamics of Gravity WAVES) research unit funded by the German Science Foundation. For this special issue, we invite contributions describing observations and related modelling studies focusing on results achieved during these field campaigns. However, beyond studies specifically addressing results obtained in the framework of GW-LCYCLE and DEEPWAVE, we also invite any related studies dealing with GW processes and their impact on the atmosphere. Within this framework, contributions focusing on both scientific and methodological aspects will be considered.

Quadrennial Ozone Symposium 2016 – Status and trends of atmospheric ozone (ACP/AMT inter-journal SI)
01 Feb 2017–15 Dec 2017 | Guest editors: S. Reis, A. F. Bais, R. S. Eckman, S. Godin-Beekmann, I. Petropavlovskikh, W. Steinbrecht, P. Young, M. Weber, H. G. J. Smit, and G. J. Phillips | Information


The study of ozone is important because of the large role it plays in protecting the Earth from harmful levels of ultraviolet solar radiation and because of its role as a greenhouse gas in the Earth's climate system, as well as the harmful effects of tropospheric ozone on human health, ecosystems, and agricultural production. In 2016, the International Ozone Commission (IO3C) organised its Quadrennial Ozone Symposium (QOS 2016) with more than 300 participants presenting the latest findings and emerging research on the full range of ozone-related topics. This special issue invites submissions of papers presented at the QOS 2016 related to the following broad subject areas:

  • stratospheric ozone
  • tropospheric ozone
  • ozone chemistry–climate interactions
  • global ozone observations and measurement techniques.

Please contact the corresponding guest editor (srei@ceh.ac.uk) prior to submitting a manuscript to this special issue.

Airborne ROmanian Measurements of Aerosols and Trace gases (AROMAT)
01 Sep 2016–01 Sep 2018 | Guest editors: D. Nicolae, M. Van Roozendael, D. Schüttemeyer, U. Friess, and J. Stutz | Information


The Airborne ROmanian Measurements of Aerosols and Trace gases (AROMAT) activity consists of a series of 4 airborne campaigns held in Romania (September 2014, August 2015, May–June 2016) and Germany (April 2016). These campaigns were supported by ESA in the framework of the preparation of future spaceborne missions and focused on studying air quality in urban areas (Bucharest, Berlin) and polluted rural areas (the Jiu Valley in Romania, where several large power plants are located). Different airborne platforms (balloons,Unmanned Aerial Vehicle (UAV), ultralight and more traditional aircraft) carried remote sensing and in-situ instruments and were operated in synergy with ground-based instruments. The campaign dataset is thus interesting not only from a geophysical perspective but also in its information contents regarding the instrument characterization aspect. The AROMAT Special Issue is dedicated to the findings related to the AROMAT activity and open to all submissions within this scope.

SKYNET – the international network for aerosol, clouds, and solar radiation studies and their applications
01 Sep 2016–31 Dec 2017 | 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.

The ACRIDICON-CHUVA campaign to study deep convective clouds and precipitation over Amazonia using the new German HALO research aircraft (ACP/AMT inter-journal SI)
11 May 2016–31 Dec 2017 | Guest editors: S. A. Penkett, S. A. Buehler, U. Schumann, and A. Heymsfield | Information


Between 1 September and 4 October 2014 a combined airborne and ground-based measurement campaign was conducted to study tropical deep convective clouds over the Brazilian rainforest. The German HALO (High Altitude and LOng range) research aircraft and extensive ground-based instrumentation were deployed in and near Manaus (state of Amazonas). The campaign was part of the German-Brazilian ACRIDICON-CHUVA venture to quantify aerosol-cloud-precipitation interactions and their thermodynamic, dynamic, and radiative effects by in situ and remote sensing measurements over Amazonia. ACRIDICON is the abbreviation for "Aerosol, Cloud, precipitation, and Radiation Interactions and DynamIcs of CONvective cloud systems", and CHUVA stands for "Cloud processes of tHe main precipitation systems in Brazil: a contribUtion to cloud resolVing modeling and to the GPM (globAl precipitation measurement)". The ACRIDICON-CHUVA field observations were carried out in cooperation with the second intensive operating period of GoAmazon 2014/15. Five scientific topics were pursued: (a) cloud vertical evolution and life cycle (cloud profiling), (b) cloud processing of aerosol particles and trace gases (inflow and outflow), (c) satellite and radar validation (cloud products), (d) vertical transport and mixing (tracer experiment), and (e) cloud formation over forested/deforested areas. Data were collected in near-pristine atmospheric conditions and in environments polluted by biomass burning and urban emissions.

Atmospheric emissions from oil sands development and their transport, transformation and deposition (ACP/AMT inter-journal SI)
22 Apr 2016–31 Oct 2017 | 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 www.netcare-project.ca. 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 2017 | Guest editors: R. Sander, H. Su, T. Wagner, T. Wang, Y. Cheng, and X. Xu | 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 2017 | 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 (www.met.reading.ac.uk/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 2015–31 May 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/BG/AMT/GMD/GI inter-journal SI)
01 Jun 2015–31 May 2018 | 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.

TROPOMI on Sentinel-5 Precursor: data products and algorithms
01 Jan 2015–31 Oct 2017 | Guest editors: B. Veihelmann, J. Joiner, R. Engelen, J. Kim, A. Saiz-Lopez, D. Loyola, and I. Aben | Information


The Sentinel-5 Precursor mission is a single-payload satellite in a low Earth orbit to be launched in summer 2017. The mission will provide daily global information on trace gases and aerosols important for air quality, climate forcing and the ozone layer. The only payload of the mission is the TROPOMI instrument which is a nadir push-broom spectrometer measuring in the ultraviolet, visible, near-infrared and the shortwave infrared. The selected wavelength range allows for the observation of key atmospheric constituents including O3, NO2, CO, SO2, CH4, CH2O, aerosols and clouds. In this special issue, scientific and operational algorithms are described and verified, which have been developed to derive the various data products from the mission.

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 Jul 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.

EARLINET, the European Aerosol Research Lidar Network
01 Mar 2013–31 Oct 2017 | Guest editors: G. Pappalardo, A. Ansmann, R. Ferrare, and N. Sugimoto | Information


The EARLINET AMT special issue aims at collecting innovative and comprehensive technical solutions and scientific results related to the use of advanced lidar remote sensing techniques for the study of aerosol properties as developed within EARLINET, the European Aerosol Research Lidar Network. EARLINET was established in 2000 with the main goal to provide a comprehensive, quantitative, and statistically significant data base for the aerosol distribution on a continental scale. The five years EARLINET-ASOS (Advanced Sustainable Observation System) EC Project project (2006–2011) has strongly contributed to optimize the operation of the network. EARLINET is now a key component of the ACTRIS (Aerosols, Clouds and Trace gases Research InfraStructure Network) research infrastructure project aiming at integrating European ground-based stations equipped with advanced atmospheric probing instrumentation for aerosols, clouds, and short-lived gas-phase species.

Publications Copernicus