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An intercomparison of intraseasonal variability in general circulation models and observationsLow frequency oscillations appearing in three GCM seasonal cycle integrations are compared with the analyses of the European Center for Medium Range Weather Forecasting (ECMWF). All three models have the same resolution: 4 deg latitude by 5 deg longitude, with 9 levels. The dominant phase speeds and the differential vertical structure of the heating profiles in the GCMs are in general agreement with current theory involving the positive feedback between latent heating and moist static stability. All three GCMs fail to capture the detailed evolution in the different stages of the development and decay of the oscillation. The results suggest that an improvement in the boundary layer moisture processes may be crucial for a better simulation of the oscillation.
Document ID
19900017912
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Park, Chung-Kyu (Centel Federal Services Corp. Reston, VA., United States)
Straus, David M. (Maryland Univ. College Park., United States)
Lau, Ka-Ming (NASA Goddard Space Flight Center Greenbelt, MD., United States)
Schubert, Siegfried D. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1990
Subject Category
Meteorology And Climatology
Report/Patent Number
NASA-TM-100764
REPT-90E02836
NAS 1.15:100764
Report Number: NASA-TM-100764
Report Number: REPT-90E02836
Report Number: NAS 1.15:100764
Accession Number
90N27228
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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