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          Institute: MPI für Meteorologie     Collection: Climate Processes     Display Documents



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ID: 224123.0, MPI für Meteorologie / Climate Processes
Cloud representation in general-circulation models over the northern Pacific Ocean: A EUROCS intercomparison study
Authors:Siebesma, A. P.; Jakob, C.; Lenderink, G.; Neggers, R. A. J.; Teixeira, J.; Van Meijgaard, E.; Calvo, J.; Chlond, Andreas; Grenier, H.; Jones, C.; Kohler, M.; Kitagawa, H.; Marquet, P.; Lock, A. P.; Müller, Frank; Olmeda, D.; Severijns, C.
Language:English
Date of Publication (YYYY-MM-DD):2004-10
Title of Journal:Quarterly Journal of the Royal Meteorological Society
Journal Abbrev.:Q. J. R. Meteorol. Soc.
Volume:130
Issue / Number:604
Start Page:3245
End Page:3267
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:The EUROCS (EUROpean Cloud Systems study) project aims to improve the treatment of cloud systems in regional and global climate and weather prediction models. This paper reports an intercomparison study of cloud representation over the Pacific Ocean for nine climate and weather prediction models. The study consists of an analysis of a June/July/August 1998 period along an idealized trajectory over the Pacific Ocean that encompasses both the ascending and descending branch of the Hadley circulation. The three cloud types that are studied by EUROCS, stratocumulus, shallow cumulus and deep-convective cloud systems, do all occur in a persistent and geographically separated way, along this trajectory.

The main focus of this study is on processes related to the hydrological cycle within the Hadley circulation. These include the large-scale dynamics (i.e. the strength of the up- and downwelling branches of the Hadley cell), the cloud processes (i.e. cloud cover, cloud amounts and precipitation), and the impact of these processes on the radiation budget both at the top of the atmosphere and at the ocean's surface.

In order to make a quantitative assessment, special care has been taken to select reliable observational datasets. The main conclusions are that (1) almost all models strongly underpredicted both cloud cover and cloud amount in the stratocumulus regions while (2) the situation is opposite in the trade-wind region and the tropics where cloud cover and cloud amount are overpredicted by most models. These deficiencies result in an overprediction of the downwelling surface short-wave radiation of typically 60 W m(-2) in the stratocumulus regimes and a similar underprediction of 60 W m(-2) in the trade-wind regions and in the intertropical convergence zone (ITCZ). Similar biases for the short-wave radiation were found at the top of the atmosphere, while discrepancies in the outgoing long-wave radiation are most pronounced in the ITCZ
Free Keywords:clouds; convection; radiation; MEASURING MISSION TRMM; MARINE STRATOCUMULUS; CLIMATE-CHANGE; PARAMETERIZATIONS; VARIABILITY; RESOLUTION; RADIATION; WEATHER; SYSTEM; FLUXES
External Publication Status:published
Document Type:Article
Version Comment:Automatic journal name synchronization
Affiliations:MPI für Meteorologie/Climate Processes/Boundary Layer Processes
External Affiliations:Royal Netherlands Meteorol Inst KNMI, NL-3730 AE Bilt, Netherlands.; Bur Meterol, Melbourne, Vic, Australia.; Univ Calif Los Angeles, Los Angeles, CA USA.; USN, Res Lab, Monterey, CA USA.; Inst Nacl Meteorol, Madrid, Spain.; CNRM GAME, Toulouse, France.; Rossby Climate Ctr, Norrkoping, Sweden.; European Ctr Medium Range Weather Forecasts, Reading, Berks, England.; Japan Meteorol Agcy, Tokyo, Japan.; Met Off, Exeter, Devon, England.
Identifiers:ISI:000226878300011 [ID No:2]
ISSN:0035-9009 [ID No:3]
DOI:10.1256/qj.03.146 [ID No:1]
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