Upper-tropospheric forcing of the intensification rates of tropical cyclones Flo and Ed based on TCM-90 observations.
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Authors
Rucker, Jeff H.
Subjects
Environmental forcing of tropical cyclone intensity
Supertyphoon Flo
Typhoon Ed
TCM-90
Supertyphoon Flo
Typhoon Ed
TCM-90
Advisors
Elsberry, Russell L.
Date of Issue
1992-06
Date
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
A case study of the upper-tropospheric forcing of the intensification rates of typhoons Flo and Ed has been accomplished. High- resolution, handdrawn
streamline analyses of the 150, 200, 250, and 300 mb winds from the final observational data set of the Tropical Cyclone Motion (TCM-90)
field experiment were constructed for 00, 06, 12, and 18 UTC during the period 00 UTC 12 September through 00 UTC 19 September. Three basic
interaction mechanisms that appeared to have major roles in upper-level forcing on Flo and Ed were defined. Outflow layer changes were
quantified through calculation of the mass divergence and eddy flux convergence of relative angular momentum using a radial-band averaging
technique at 200 mb. A nearly 1:1 qualitative relationship was found to exist between the development of one or more of the these mass/heat
export mechanisms and corresponding changes in the intensification rates. These calculations from the best-ever typhoon region data set strongly
suggest that upper-level forcing leads the intensification process by 12-24 h.
Type
Thesis
Description
Series/Report No
Department
Meteorology and Physical Oceanography
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
Sponsors
Funder
Format
184 p.;28 cm.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.