Impact of extensive irrigation on the formation of cumulus clouds

Details Impact of extensive irrigation on the formation of cumulus clouds Impact of extensive irrigation on the formation of cumulus clouds

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3501806k&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 1, CiteID L01806

Physics

3

Atmospheric Processes: Land/Atmosphere Interactions (1218, 1631, 1843), Atmospheric Processes: Boundary Layer Processes, Atmospheric Processes: Regional Modeling, Atmospheric Processes: Mesoscale Meteorology

Scientific paper

Irrigated farmland in an arid region creates a prominent heat contrast along its boundary. A statistical analysis of satellite images indicated that the frequency distribution of clouds has a clear contrast between the Hetao Irrigation District in China and the surrounding dry area in the summer. In this paper, we use a mesoscale model to clarify the impact of the extensive irrigation on the cloud formation. The numerical experiment assuming simplified irrigation indicates that the colder surface of the irrigated area induces a surface wind toward the dry area, where the surface temperature is higher. This wind is a part of a land-use-induced circulation. The circulation matures in the early afternoon and generates clouds near the border of the dry area and irrigated area.

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