Summer season land cover-convective cloud associations for the Midwest U.S. ``Corn Belt''

Details Summer season land cover-convective cloud associations for the Midwest U.S. ``Corn Belt'' Summer season land cover-convective cloud associations for the Midwest U.S. ``Corn Belt''

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.1679c&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 9, p. 1679-1682

Physics

9

Global Change: Climate Dynamics, Hydrology: Anthropogenic Effects, Meteorology And Atmospheric Dynamics: Land/Atmosphere Interactions, Meteorology And Atmospheric Dynamics: Mesoscale Meteorology

Scientific paper

Human-induced land cover modifications impact the planetary boundary layer's (PBL) thermal and moisture regimes on mesoscales. We investigate the association of croplands, forest, and the crop-forest ``boundary'' (CFB) with convective-cloud development (timing, amount) for three target areas (TAs) in the U.S. Midwest ``Corn Belt,'' during the summer seasons (JJA) 1991-98. For each land cover, hourly satellite-retrieved albedo and cloud-top temperature values are composited for three classes of mid-tropospheric synoptic circulation. On days with the strongest anticyclonicity, there are no consistent differences in convection related to land cover type: cloud development is regionalized and tied primarily to synoptic conditions. However, on days having weaker anticyclonicity the CFB is the dominant site of free convection, suggesting that Non-Classical Mesoscale Circulations (NCMCs) between cropped and adjacent forest areas may operate when reduced subsidence in the mid-troposphere does not effectively cap the PBL. Index terms: Land/atmosphere interactions (3322), Mesoscale meteorology (3329), Climate dynamics (1620), Anthropogenic effects (1803).

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