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On wave-CISK and the evaporation-wind feedback for the Madden-Julian oscillationThe combined effects of Kelvin wave-CISK and the evaporation-wind (E-W) feedback are proposed as a possible mechanism for the Madden-Julian oscillation. A very simple single vertical mode model has been employed to examine the effects of both these processes on moist Kelvin waves. The effects of wave-induced moisture convergence is parameterized by reducing the moist static stability, and CISK occurs when the moist static stability becomes negative. The E-W feedback in the presence of mean easterlies leads to unstable Kelvin modes. The presence of mean westerlies leads to decaying Kelvin modes. When CISK and the E-W feedback work in concert, an unstable Kelvin mode develops that has phase speeds of propagation between 5 m/s and 10 m/s for a large range of parameter values. On the other hand, the E-W feedback mechanism alone, in the case when CISK is not operating, produces the phase speeds of the observed Madden-Julian oscillation for only a very limited range of parameter values.
Document ID
19940033564
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kirtman, B.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Vernekar, A.
(Maryland Univ. College Park, United States)
Date Acquired
August 16, 2013
Publication Date
August 15, 1993
Publication Information
Publication: Journal of the Atmospheric Sciences
Volume: 50
Issue: 16
ISSN: 0022-4928
Subject Category
Meteorology And Climatology
Accession Number
94A10219
Funding Number(s)
CONTRACT_GRANT: NAS5-31341
CONTRACT_GRANT: NSF ATM-91-14318
Distribution Limits
Public
Copyright
Other

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