Working Group: Atmosphere, Ice and Ocean
Coordinator
Jennifer Brauch
Wikis AIO and NEMO-Europe
Overall Objective
The main general aim is to improve the representation of the regional ocean and its interaction with the atmosphere in the COSMO-CLM.
State of the art, scientific developments
Regional climate models (RCMs) are tools for dynamical downscaling coarse results from global climate circulation models (CGCMs), which are nowadays mainly coupled atmosphere-ocean models (AOGCMs). Ideally RCMs should be able to determine the regional climate without influence of the CGCMs, except at the lateral boundaries. However, presently this is not the case for COSMO-CLM, since the lower boundary values over sea are taken from the AOGCMs. This has a major impact on the quality of the regional model simulations as shown already for the Baltic Sea. To overcome this problem regional coupled atmosphere-ocean models may be used for climate simulations. Several groups in the CLM-Community are working on the coupling of a regional ocean to COSMO-CLM.
Objectives of participating groups
- Improve the representation of the ocean and the interaction with the atmosphere in the COSMO-CLM (Goethe University Frankfurt, BiK-F)
- Better regional representation of North Sea and Baltic Sea in climate simulations (Hereon)
- Simulating polynya processes in the Laptev Sea and the Weddell Sea with a fully coupled A-I-O model (University Trier)
- Assess the added value of high resolution climatic hindcasts and scenarios for the Mediterranean when using coupled atmosphere-ocean models (IMK-TRO (KIT))
- To get a better accuracy, since in the CIRA simulations the lower boundary values over sea are taken from the global coupled model CMCC-MED. A better regional representation of the Mediterranean Sea is also important in order to increase the accuracy also for climate simulations of the Alpine space (CIRA)
- Carry out simulations over the Southern Ocean to investigate seasonal simulations covering the confluence region of the Brazil and Malvinas currents, where many oceanic eddies occur (C2SM-ETHZ). Thereby two major questions are addressed:
- What is the impact of the highly resolved SST on fluxes between the atmosphere and the ocean and on the lower troposphere? Are highly resolved SSTs required to realistically represent fluxes of heat and freshwater in that region?
- How are these processes affected by the coupling between the atmosphere and the ocean?
Overview
The red boxes give a rough idea of the domains, however, they do not represent the exact boundaries.
| Models: Ocean / Ice / Runoff | Region | Scientists | Institution | Status |
|---|---|---|---|---|
| NEMO / (LIM) / TRIP | Mediterranean Sea, North Sea, Baltic Sea | Jennifer Brauch, Bodo Ahrens, Trang van Pham, Naveed Akhtar | GUF, BiK-F, DWD | running |
| NEMO / (LIM) / HD | North Sea, Baltic Sea | Ha Hagemann, Burkhardt Rockel | Hereon | running |
| TRIM / CICE / | North Sea, Baltic Sea | Ha Hagemann, Burkhardt Rockel | Hereon | development stopped |
| FESOM / FESOM | CCLM / | Arctic, Laptev Sea, Svalbard | Oliver Gutjahr | MPI-M | planned |
| NEMO?/ (LIM) / | (Western) Mediterranean, Northeast Atlantic | Hendrik Feldmann, Gerd Schädler, Hans-Jürgen Panitz | IMK-TRO (KIT) | no update available |
| NEMO / (LIM) / | Mediterranean Sea | Andreas Will | BTU Cottbus | planned |
| NEMO / (LIM) / | Mediterranean Sea | Leone Cavicchia, Antonella Sanna, Silvio Gualdi and Paolo Oddo | CMCC | no update available |
| ROMS / / | Southern Atlantic | David Byrne, Lukas Papritz | ETHZ | no update available |
| MOM / SIS /ERGOM | Baltic Sea | Markus Meier, Claudia Frauen | IOW | planned |
| Ocean model / | CORDEX East Asia | Donghyun Lee | Pohang University of Science and Technology, South Korea | planned |
Meetings
| Date | Meeting and Location | Documents |
|---|---|---|
| 2017/09/19 | CLM-Assembly in Graz | |
| 2017/03/09 | ICCARUS in Offenbach | |
| 2016/09/19 | CLM-Assembly in Lüneburg | |
| 2013/08/29 | CLM-Community Assembly in Zürich |
|
| 2013/03/07 | COSMO/CLM Seminar in Offenbach |
|
| 2012/09/17 | CLM-Community Assembly in Leuven | |
| 2012/03/08 | COSMO/CLM Seminar in Offenbach |
|
| 2011/08/30 | CLM-Community Assembly in Cava de' Tirreni |
|
| 2011/03/03 | COSMO/CLM Seminar in Langen |
|
| 2010/08/31 | Startup Meeting in Berlin |
|
Documents
2011/08/26 
Annual report 2011 [79 Kb]
2012/09/13 Annual report 2012 [88 kb]
2013/09/17 Annual report 2013 [110kb]
Publications
Akhtar, N., J. Brauch, B. Ahrens (2017): Climate Modeling over the Mediterranean Sea: Impact of Resolution and Ocean Coupling. Clim. Dyn. DOI 10.1007/s00382-017-3570-8
Akhtar, N.J., J. Brauch, A. Dobler, K. Béranger, B. Ahrens (2014): Medicanes in an ocean-athmosphere coupled regional climate model. Nat. Hazards Earth Syst. Sci., 14, 2189-2201, doi:10.5194/nhess-14-2189-2014
Byrne, D., M. Münnich, I. Frenger, N. Gruber (2016): Mesoscale atmosphere ocean coupling enhances the transfer of wind energy into the ocean, Nature Communications 7, doi:10.1038/ncomms11867
Ho-Hagemann, H.T.M., Hagemann, S., Grayek, S., Petrik, R., Rockel, B., Staneva, J., Feser, F., & Schrum, C. (2020): Internal Model Variability of the Regional Coupled System Model GCOAST-AHOI. Atmosphere 2020, 11, 227, doi:10.3390/atmos11030227
Ho-Hagemann, H.T.M., & Rockel, B. (2018): Einfluss von Atmosphäre-Ozean Wechselwirkungen auf Starkniederschläge über Europa. In: Lozán, J.L., Breckle, S.-W., Graßl, H., Kasang, D., & Weisse, R. (Hsg.): Warnsignal Klima: Extremereignisse, www.klima-warnsignale.uni-hamburg.de/wetterextreme/
Ho-Hagemann, H., Gröger, M., Rockel, B., Zahn, M., Geyer, B., Meier, M., 2017: Effects of air-sea coupling over the North Sea and the Baltic Sea on simulated summer precipitation over Central Europe, Climate Dynamics,pp 1–26, doi:10.1007/s00382-017-3546-8.
Ho-Hagemann, H.T.M., S. Hagemann, B. Rockel (2015): On the role of soil moisture in the generation of heavy rainfall during the Oder flood event in July 1997. Tellus A, 67, 28661. DOI:10.3402/tellusa.v67.28661.
Ho-Hagemann H, Rockel B, Kapitza H and Geyer B (2013): COSTRICE-an atmosphere-ocean-sea ice model coupled system using OASIS3, HZG Report (2013-5), 24pp
Pham, Trang Van; J. Brauch, B. Früh, B. Ahrens (2017): Simulation of snowbands in the Baltic Sea area with the coupled atmosphere-ocean-ice model COSMO-CLM/NEMO. Met. Z., doi: 10.1127/metz/2016/0775
Pham, T.V., J. Brauch, C. Dieterich, B. Früh, B. Ahrens (2014): New coupled atmosphere-ocean-ice system COSMO-CLM/NEMO: On the air temperature sensitivity on the North and Baltic Seas. Oceanologia, 56(2), 167-189, doi:10.5697/oc.56-2.167
Rockel, B., J. Brauch, O. Gutjahr, N. Akhtar, H.T.M. Ho-Hagemann (2017): Gekoppelte Modellsysteme: Atmosphäre und Ozean. Promet - Meteorologische Fortbildung, 99, 65-75
Ruti P.M., S. Somot, F. Giorgi, C. Dubois, E. Flaounas, A. Obermann, A. Dell'Aquila, G. Pisacane, A. Harzallah, E. Lombardi, B. Ahrens, N. Akhtar, A. Alias, T. Arsouze, R. Aznar, S. Bastin, J. Bartholy, K. Béranger, J. Beuvier, S. Bouffies-Cloché, J. Brauch, W. Cabos, S. Calmanti, J.-C. Calvet, A. Carillo D. Conte, E. Coppola, V. Djurdjevic, P. Drobinski, A. Elizalde-Arellano, M. Gaertner, P. Galàn, C. Gallardo, S. Gualdi, M. Goncalves, O. Jorba, G. Jordà, B. L'Heveder, C. Lebeaupin-Brossier, L. Li, G. Liguori, P. Lionello, D. Maciàs-Moy, P. Nabat, B. Onol, B. Rajkovic, K. Ramage, F. Sevault, G. Sannino, M.V. Struglia, A. Sanna, C. Torma, V. Vervatis (2016): MED-CORDEX initiative for Mediterranean Climate studies. Bull. of the American Meteorological Society, 97(7), 1187-1208, doi: 10.1175/BAMS-D-14-00176.1
Will,A., N. Akhtar, J. Brauch, M. Breil, E. Davin, H. T. M. Ho-Hagemann, E. Maisonnave, M. Thürkow, and S. Weiher (2017): The COSMO-CLM 4.8 regional climate model coupled to regional ocean, land surface and global earth system models using OASIS3-MCT: description and performance. Geoscientific Model Development, 10:1549–1586, doi:10.5194/gmd-10-1549-2017
Members
Bodo Ahrens, Naveed Akhtar, Jennifer Brauch, Sandra Brunnabend, David Byrne, Manuel Dröse, Hendrik Feldmann, Claudia Frauen, Barbara Früh, Oliver Gutjahr, Ha Hagemann, Günther Heinemann, Astrid Kerkweg, Svenja Kohnemann, Praveen Kumar, Donghyun Lee, Hans-Jürgen Panitz, Lukas Papritz, Cristina Primo, Burkhardt Rockel, Gerd Schädler, Christoph Stegert, Trang Van Pham, Andreas Will, Rolf Zentek
Mailing List
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Coordinator Alumni List
Bodo Ahrens (2014 - 2016)
Burkhardt Rockel (2010 - 2014)
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