期刊
GEOPHYSICAL RESEARCH LETTERS
卷 49, 期 7, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2021GL097070
关键词
shallow cumulus; GOES; surface heat flux; land atmosphere interaction; land cover; secondary circulations; cloud
资金
- Department Of Energy (DOE) Office of Science Early Career Research Program
- DOE Atmospheric System Research program
- NOAA grant (Cooperative Institute for Satellite Earth System Studies) at the University of Maryland/Earth System Science Interdisciplinary Center [NA19NES4320002]
- U.S. DOE [DE-AC52-07NA27344]
This study investigates the effects of heterogeneous land covers on shallow cumulus clouds at the US Southern Great Plains. The results show that during late summer, these clouds occur most frequently over cities and least frequently over open waters, with a higher occurrence over forest compared to grassland. This preference also varies with the length scales of land patches, and is more pronounced under low wind conditions.
This study investigates the effects of heterogeneous land covers on shallow cumulus (ShCu) clouds at the US Southern Great Plains using high-resolution satellite and land cover data. During late summer, ShCu occurs over cities the most frequently and over open waters the least frequently, and more often over forest than over grassland. The preferential occurrence of ShCu over forest relative to grassland is consistent with surface measurements showing larger heat fluxes over forests. This preferential occurrence also varies with the length scales of land patches with the largest cloud occurrence difference shifting from smaller length scales (<9 km) during midday to larger scales (>9 km) in the early afternoon. Consistent with theory, these signals are more pronounced under low wind conditions. The preferential length scale shift with time suggests the existence of secondary circulations that strengthen and promote convergence over larger spatial scales as the differential land surface heating intensifies.
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