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Absolute barotropic instability and monsoon depressionsMonsoon depressions over the Bay of Bengal develop almost entirely in July and August. After studies conducted by Lindzen et al. (1980) and Stevens and Lindzen (1978), only barotropic instability remains as a mechanism for the development of the wave disturbances associated with monsoon depressions. The present investigation has the objective to show that barotropic instability is able to explain the wave aspects of monsoon depressions, but that normal mode analysis is inadequate. It is found that the local barotropically unstable response to regional perturbations in the Bay of Bengal during July and August will be dominated by the lower troposphere. The analysis clearly identifies the features of the mean flow which lead to monsoon depressions in July. The features include the development of an easterly jet as opposed to semijet structure in the mean flow, and the development of a modest easterly flow at the jet center as opposed to westerly flow.
Document ID
19830058816
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Lindzen, R. S.
(Harvard Univ. Cambridge, MA, United States)
Farrell, B.
(Harvard University Cambridge, MA, United States)
Rosenthal, A. J.
(MIT Cambridge, MA, United States)
Date Acquired
August 11, 2013
Publication Date
May 1, 1983
Publication Information
Publication: Journal of the Atmospheric Sciences
Volume: 40
ISSN: 0022-4928
Subject Category
Meteorology And Climatology
Accession Number
83A40034
Funding Number(s)
CONTRACT_GRANT: NGL-22-007-228
CONTRACT_GRANT: NSF ATM-78-23330
CONTRACT_GRANT: NSF ATM-80-23523
Distribution Limits
Public
Copyright
Other

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