Atmos. Chem. Phys. Discuss., 13, 12541-12724, 2013
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Online coupled regional meteorology-chemistry models in Europe: current status and prospects
A. Baklanov1, K. H. Schluenzen2, P. Suppan3, J. Baldasano4, D. Brunner5, S. Aksoyoglu6, G. Carmichael7, J. Douros8, J. Flemming9, R. Forkel3, S. Galmarini10, M. Gauss11, G. Grell12, M. Hirtl13, S. Joffre14, O. Jorba4, E. Kaas15, M. Kaasik16, G. Kallos17, X. Kong18, U. Korsholm1, A. Kurganskiy19, J. Kushta8, U. Lohmann20, A. Mahura1, A. Manders-Groot21, A. Maurizi22, N. Moussiopoulos8, S. T. Rao23, N. Savage24, C. Seigneur25, R. Sokhi18, E. Solazzo10, S. Solomos8, B. Sørensen15, G. Tsegas8, E. Vignati10, B. Vogel26, and Y. Zhang27
1Danish Meteorological Institute, Copenhagen, Denmark
2University of Hamburg, Hamburg, Germany
3Karlsruhe Institute of Technology, Garmisch-Partenkirchen, Germany
4Barcelona Supercomputing Center, Barcelona, Spain
5Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland
6Paul Scherrer Institute, Villigen, Switzerland
7Center for Global and Regional Environmental Research, University of Iowa, USA
8Aristotle University, Thessaloniki, Greece
9European Centre for Medium-Range Weather Forecasts, Reading, UK
10European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra, Italy
11Norwegian Meteorological Institute, Bergen, Norway
12NOAA/ESRL, Boulder, Colorado, USA
13Central Institute for Meteorology and Geodynamic, Vienna, Austria
14Finnish Meteorological Institute, Helsinki, Finland
15Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
16University of Tartu, Tartu, Estonia
17University of Athens, Athens, Greece
18University of Hertfordshire, Hatfield, UK
19Russian State Hydrometeorological University, St.-Petersburg, Russian Federation
20Institute for Atmospheric and Climate Science, ETH, Zurich, Switzerland
21TNO, Utrecht, the Netherlands
22Institute of Atmospheric Sciences and Climate, Italian National Research Council, Bologna, Italy
23US Environmental Protection Agency, Research Triangle Park, NC, USA
24Met Office, Exeter, UK
25CEREA, Joint laboratory École des Ponts ParisTech/EDF R & D, Université Paris-Est, Marne-la-Vallée, France
26Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
27North Carolina State University, Raleigh, USA

Abstract. The simulation of the coupled evolution of atmospheric dynamics, pollutant transport, chemical reactions and atmospheric composition is one of the most challenging tasks in environmental modelling, climate change studies, and weather forecasting for the next decades as they all involve strongly integrated processes. Weather strongly influences air quality (AQ) and atmospheric transport of hazardous materials, while atmospheric composition can influence both weather and climate by directly modifying the atmospheric radiation budget or indirectly affecting cloud formation. Until recently, however, due to the scientific complexities and lack of computational power, atmospheric chemistry and weather forecasting have developed as separate disciplines, leading to the development of separate modelling systems that are only loosely coupled.

The continuous increase in computer power has now reached a stage that enables us to perform online coupling of regional meteorological models with atmospheric chemical transport models. The focus on integrated systems is timely, since recent research has shown that meteorology and chemistry feedbacks are important in the context of many research areas and applications, including numerical weather prediction (NWP), AQ forecasting as well as climate and Earth system modelling. However, the relative importance of online integration and its priorities, requirements and levels of detail necessary for representing different processes and feedbacks can greatly vary for these related communities: (i) NWP, (ii) AQ forecasting and assessments, (iii) climate and earth system modelling. Additional applications are likely to benefit from online modelling, e.g.: simulation of volcanic ash or forest fire plumes, pollen warnings, dust storms, oil/gas fires, geo-engineering tests involving changes in the radiation balance.

The COST Action ES1004 – European framework for online integrated air quality and meteorology modelling (EuMetChem) – aims at paving the way towards a new generation of online integrated atmospheric chemical transport and meteorology modelling with two-way interactions between different atmospheric processes including dynamics, chemistry, clouds, radiation, boundary layer and emissions. As its first task, we summarise the current status of European modelling practices and experience with online coupled modelling of meteorology with atmospheric chemistry including feedback mechanisms and attempt reviewing the various issues connected to the different modules of such online coupled models but also providing recommendations for coping with them for the benefit of the modelling community at large.

Citation: Baklanov, A., Schluenzen, K. H., Suppan, P., Baldasano, J., Brunner, D., Aksoyoglu, S., Carmichael, G., Douros, J., Flemming, J., Forkel, R., Galmarini, S., Gauss, M., Grell, G., Hirtl, M., Joffre, S., Jorba, O., Kaas, E., Kaasik, M., Kallos, G., Kong, X., Korsholm, U., Kurganskiy, A., Kushta, J., Lohmann, U., Mahura, A., Manders-Groot, A., Maurizi, A., Moussiopoulos, N., Rao, S. T., Savage, N., Seigneur, C., Sokhi, R., Solazzo, E., Solomos, S., Sørensen, B., Tsegas, G., Vignati, E., Vogel, B., and Zhang, Y.: Online coupled regional meteorology-chemistry models in Europe: current status and prospects, Atmos. Chem. Phys. Discuss., 13, 12541-12724, doi:10.5194/acpd-13-12541-2013, 2013.
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