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| Titel |
The PreVOCA experiment: modeling the lower troposphere in the Southeast Pacific |
| VerfasserIn |
M. C. Wyant, R. Wood, C. S. Bretherton, C. R. Mechoso, J. Bacmeister, M. A. Balmaseda, B. Barrett, F. Codron, P. Earnshaw, J. Fast, C. Hannay, J. W. Kaiser, H. Kitagawa, S. A. Klein, M. Köhler, J. Manganello, H.-L. Pan, F. Sun, S. Wang, Y. Wang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 10 ; Nr. 10, no. 10 (2010-05-26), S.4757-4774 |
| Datensatznummer |
250008475
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| Publikation (Nr.) |
 copernicus.org/acp-10-4757-2010.pdf |
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| Zusammenfassung |
| The Preliminary VOCALS Model Assessment (PreVOCA) aims to
assess contemporary atmospheric modeling of the subtropical
South East Pacific, with a particular focus on the clouds and
the marine boundary layer (MBL). Models results from fourteen
modeling centers were collected including operational forecast
models, regional models, and global climate models for the
month of October 2006. Forecast models and global climate
models produced daily forecasts, while most regional models
were run continuously during the study period, initialized and
forced at the boundaries with global model analyses. Results
are compared in the region from 40° S to the equator
and from 110° W to 70° W, corresponding to the
Pacific coast of South America. Mean-monthly model surface
winds agree well with QuikSCAT observed winds and models agree
fairly well on mean weak large-scale subsidence in the region
next to the coast. However they have greatly differing geographic
patterns of mean cloud fraction with only a few models
agreeing well with MODIS observations. Most models also
underestimate the MBL depth by several hundred meters in the
eastern part of the study region. The diurnal cycle of liquid
water path is underestimated by most models at the
85° W 20° S stratus buoy site compared with
satellite, consistent with previous modeling studies. The low
cloud fraction is also underestimated during all parts of the
diurnal cycle compared to surface-based climatologies. Most
models qualitatively capture the MBL deepening around 15 October 2006 at the stratus buoy, associated with colder air at
700 hPa. |
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