Physics
Scientific paper
Nov 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3821808k&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 21, CiteID L21808
Physics
Atmospheric Processes: Boundary Layer Processes, Atmospheric Processes: Clouds And Cloud Feedbacks, Atmospheric Processes: Mesoscale Meteorology, Atmospheric Processes: Global Climate Models (1626, 4928), Atmospheric Processes: Tropical Meteorology
Scientific paper
New ground- and space-based observations show that summertime southern West Africa is frequently affected by an extended cover of shallow, non-precipitating clouds only few hundred meters above the ground. These clouds are associated with nocturnal low-level wind speed maxima and frequently persist into the day, considerably reducing surface solar radiation. While the involved phenomena are well represented in re-analysis data, climate models show large errors in low-level wind, cloudiness, and solar radiation of up to 90 W m-2. Errors of such a magnitude could strongly affect the regional energy and moisture budgets, which might help to explain the notorious difficulties of many models to simulate the West African climate. More effort is needed in the future to improve the monitoring, modeling, and physical understanding of these ultra-low clouds and their importance for the West African monsoon system.
Fink Andreas H.
Knippertz Peter
Schrage Jon M.
Schuster Robert
Trentmann Jörg
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