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Satellite observations of variations in tropical cyclone convection caused by upper-tropospheric troughsSatellite observations and numerical model results have been used to study the relationship between upper-tropospheric forcing and the oscillation of convection of tropical cyclones Florence (1988) and Irene (1981) during their mature stage over open warm oceans (SST greater than or equal to 26 C). It is suggested that the initiation and maintenance of intense convective outbreaks in tropical cyclones are related to the channeling and strengthening of their outflow by upper-tropospheric troughs. It is possible to enhance the convection in response to the outflow jet-induced import of eddy relative angular momentum and ascending motion associated with the thermally direct circulation. Both Florence and Irene are found to intensify after the onset of these convective episodes. It is also suggested that the cessation in the convection of the two tropical cyclones occurs when the upper-tropospheric troughs move near or over the tropical cyclones, resulting in the weakening of their outflow and the entrainment of dry upper-tropospheric air into their inner core.
Document ID
19910065538
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Rodgers, Edward B.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Chang, Simon W.
(U.S. Navy, Naval Research Laboratory, Washington DC, United States)
Stout, John
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Steranka, Joseph
(General Science Corp. Laurel, MD, United States)
Shi, Jainn-Jong
(North Carolina State University Raleigh, United States)
Date Acquired
August 14, 2013
Publication Date
August 1, 1991
Publication Information
Publication: Journal of Applied Meteorology
Volume: 30
ISSN: 0894-8763
Subject Category
Meteorology And Climatology
Accession Number
91A50161
Distribution Limits
Public
Copyright
Other

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