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Working Group: Atmosphere, Ice and Ocean

Coordinator

Ha Hagemann

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 the 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 the 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 better accuracy, since in the CIRA simulations the lower boundary values over the 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	Minutes
2017/03/09	ICCARUS in Offenbach	Minutes Presentations in the WG AIO meeting
2016/09/19	CLM-Assembly in Lüneburg	Minutes
2013/08/29	CLM-Community Assembly in Zürich	Minutes [52 kb]
2013/03/07	COSMO/CLM Seminar in Offenbach	Minutes [42 kb]
2012/09/17	CLM-Community Assembly in Leuven	Minutes [52 kb] Presentation in the WG AIO meeting [347 kb] Plenary presentation of WG AIO [155 kb]
2012/03/08	COSMO/CLM Seminar in Offenbach	Minutes [21 kb] BiK-F/FUB Brauch [6.2 Mb] HZG Rockel (für Ho) [697 Kb] Trier Gutjahr (für Heinemann) [2.6 Mb]
2011/08/30	CLM-Community Assembly in Cava de' Tirreni	Minutes [27 Kb] ETHZ Davin [211 Kb] BiK-F/FUB Brauch/Dobler [976 Kb] HZG Ho [1.3 Mb] Presentation of WG AIO [161 Kb]
2011/03/03	COSMO/CLM Seminar in Langen	Minutes [70 Kb] CIRA_Bucchignani [233 Kb] GUF-BiK-F_Dobler_Brauch [3.7 Mb] UniTrier_Heinemann [6.7 Mb] ZAMG_Anders [1.7 Mb]
2010/08/31	Startup Meeting in Berlin	Minutes [32 Kb] Presentation of WG AIO [560 Kb]

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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