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Record 2 of 460
The influence of land surface properties on Sahel climate. Part 1: Desertification
External Online Source: doi:10.1175/1520-0442(1993)006<2232:TIOLSP>2.0.CO;2
Author and Affiliation:
Xue, Yongkang(Center for Ocean-Land-Atmosphere Studies, Calverton, MD, United States)
Shukla, Jagadish(Center for Ocean-Land-Atmosphere Studies, Calverton, MD, United States)
Abstract: This is a general circulation model sensitivity study of the physical mechanisms of the effects of desertification on the Sahel drought. The model vegetation types were changed in the prescribed desertification area, which led to changes in the surface characteristics. The model was integrated for three months (June, July, August) with climatological surface conditions (control) and desertification conditions (anomaly) to examine the summer season response to the changed surface conditions. The control and anomaly experiments consisted of five pairs of integrations with different initial conditions and/or sea surface temperature boundary conditions. In the desertification experiment, the moisture flux convergence and rainfall were reduced in the test area and increased to the immediate south of this area. The simulated anomaly dipole pattern was similar to the observed African drought patterns in which the axis of the maximum rainfall shifts to the south. The circulation changes in the desertification experiment were consistent with those observed during sub-Saharan dry years. The tropical easterly jet was weaker and the African easterly jet was stronger than normal. Further, in agreement with the observations, the easterly wave disturbances were reduced in intensity but not in number. Descending motion dominated the desertification area. The surface energy budget and hydrological cycle were also changed substantially in the anomaly experiment.
Publication Date: Dec 01, 1993
Document ID:
19950051156
(Acquired Dec 28, 1995)
Accession Number: 95A82755
Subject Category: METEOROLOGY AND CLIMATOLOGY
Document Type: Journal Article
Publication Information: Journal of Climate (ISSN 0894-8755); 6; 12; p. 2232-2245
Publisher Information: United States
Contract/Grant/Task Num: NSF ATM-90-19296; NAGW-1269; NAGW-557
Financial Sponsor: NASA; United States
Organization Source: NASA; Washington, DC, United States
Description: 13p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: AFRICA; ATMOSPHERIC GENERAL CIRCULATION MODELS; CLIMATE; DESERTIFICATION; DROUGHT; RAIN; SAHARA DESERT (AFRICA); SEA SURFACE TEMPERATURE; ALBEDO; CLOUD COVER; HYDROLOGICAL CYCLE; LATENT HEAT; LONG WAVE RADIATION; SHORT WAVE RADIATION; SOIL MOISTURE; VEGETATION
Imprint And Other Notes: Journal of Climate vol. 6, no. 12 p. 2232-2245 December 1993
Availability Source: Other Sources
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