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An evaluation of the structure of tropical intraseasonal oscillations in three general circulation modelsThe attributes for the simulation of tropical intraseasonal oscillations in the 30 to 60 day range by three GCMs are compared with analyses of the European Center for Medium-Range Weather Forecasts. Models under consideration include the Goddard Laboratory of Atmospheric sciences (GLAS), Goddard Laboratory for Atmospheres (GLA), and UCLA GCMs. They are characterized by the same resolutions of four degrees latitude by five degrees longitude with 9 levels. Observations reveal that the eastward traveling planetary scale structure becomes more stationary over the Indonesian region and accelerates over the Central Pacific. In the tropics a Kelvin wave-type structure is found to be dominant near the center of the oscillation. The simulated winds are realistic although the meridional component is too strong, especially in the GLA GCM. The differences in the structure of the oscillation in the GLAS GCM and GLA GCM are considered to be a consequence of the different numerical schemes used. The GCMs are characterized by preferred zones for diabatic heating, with a turn-on heating occurring when the rising branch of the intraseasonal oscillation passes over these convective regions.
Document ID
19920052096
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Park, Chung-Kyu
(NASA Goddard Space Flight Center; Centel Federal Services Corp. Greenbelt, MD, United States)
Straus, David M.
(Maryland, University College Park, United States)
Lau, Ka-Ming
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 15, 2013
Publication Date
August 1, 1990
Publication Information
Publication: Meteorological Society of Japan, Journal
Volume: 68
ISSN: 0026-1165
Subject Category
Meteorology And Climatology
Accession Number
92A34720
Funding Number(s)
CONTRACT_GRANT: NAG5-1094
Distribution Limits
Public
Copyright
Other

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