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Tropical impacts of SST forcing: A case study for 1987 versus 1988The response of the NASA/Goddard Institute for Space Studies general circulation model (GCM) to large tropical sea surface temperature (SST) anomalies is investigated by evaluating model simulations of the particularly contrasting summer monsoon seasons 1987 and 1988. These years are representative of the warm and cold phases, respectively, of a recent El Nino-Southern Oscillation (ENSO) event. An ensemble averaging the results of three simulations was considered for each season, using monthly mean observed SST anomalies for June-August 1987 and 1988 as lower boundary forcing. Consistent with the European Center for Medium Weather Forecast (ECMWF)-analyzed winds, the simulations based on 1988 as compared to 1987 SST exhibit stronger upper-tropospheric irrotational circulation between the monsoon regions and the Southern Hemispheric sub-tropical anticyclones, a stronger Pacific Walker cell and a weaker subtropical westerly jet over the South Pacific. In the same vein, the modeled precipitation, indicating a more northerly position of the Pacific Inter-Tropical Convergence Zone (ITCZ) in 1988 compared with 1987, is supported by satellite observations of outgoing longwave radiation and highly reflective clouds.
Document ID
19950033013
Document Type
Reprint (Version printed in journal)
Authors
Druyan, Leonard M. (NASA Goddard Institute for Space Studies, New York, NY United States)
Hastenrath, Stefan (University of Wisconsin-Madison, Madison, WI United States)
Date Acquired
August 16, 2013
Publication Date
August 1, 1994
Publication Information
Publication: Journal of Climate
Volume: 7
Issue: 9
ISSN: 0894-8755
Subject Category
METEOROLOGY AND CLIMATOLOGY
Funding Number(s)
CONTRACT_GRANT: NOAA-NA-26GP008801
CONTRACT_GRANT: NSF ATM-91-01097
CONTRACT_GRANT: DE-FG02-92ER61477
Distribution Limits
Public
Copyright
Other