Observational-numerical study of maritime extratropical cyclones using FGGE data
By: Russell L. Elsberry, Carlyle H. Wash, Chi-Sann Liou, James E. Peak
Contributors: Wash, Carlyle H.; Liou, Chi-Sann; Peak, James E.; Naval Postgraduate School (U.S.). Dept. of Meteorology
Publisher: Naval Postgraduate School; Available from National Technical Information Service
Published: 1985
Place of publication: Monterey, Calif; Springfield, Va
Language: eng
Number of pages: 40
Subjects: Extratropical cyclones; Cyclones
Other titles: NPS-63-85-001.
Description: Analyses of First GARP Global Experiment (FGGE) data have been used to study three      cases of maritime extratropical cyclone development. It has been demonstrated that these      FGGE analyses are consistent with the observations through synoptic comparisons and      satellite interpretations. Quasi-Lagrangian diagnostic budgets of mass, vorticity, angular      momentum and heat have been computed in pressure coordinates for observed and      model-generated cyclones. The roles of jet streaks and small static stability in the lower      troposphere during rapid development of maritime cyclones have been documented. Vertical      circulation trends in the mass budget are consistent with the sea-level pressure evolution in      each case. Inward transport of vorticity due to the jet streak coincides with the rapid      development phase. Vorticity budgets of these maritime cyclones appear to be consistent      with earlier studies of continental cyclones. To complement the observational studies, similar      diagnostic studies hace been done for numerical simulations of maritime cyclogenesis under      straight upper- level flow. These studies demonstrate that similar physical mechanisms are      involved in the simulated storms as were found in the FGGE-based studies. Two sets of      numerical model predictions from the FGGE analyses were examined for an explosively      deepening cyclone over the western North Pacific Ocean. Both models predicted the most      rapid deepening phase too early and resulted in too low sea- level pressures.
Notes: Title from cover.

"NPS-63-85-001."

"May 1985."

"Final report for period June 1982 - May 1985."

AD A157 390.

Includes bibliographical references (p. 37-39).

aq/aq cc:9116 01/19/99.