AN INVESTIGATION INTO THE RELATIONSHIP OF MONTHLY CIRCULATION INDICES AND ANOMALIES TO TYPHOON DEVELOPMENT (IN THE WESTERN PACIFIC)
Abstract
Evidence is presented which indicates that a strong contributing factor for the frequency maximum in the Western Pacific area is its favorable position with respect to an active cyclogenetic region near the Bering Sea-Aleutian Island area. Monthly typhoon incidence was found to be significantly correlated with pressureheight anomalies in this region. The position and intensity of the western section of the subtropical ridge were also related to typhoon frequency but to a lesser extent. A modified Hovmoller diagram was prepared and analyzed for the 1956 typhoon season in order to examine on a daily synoptic basis the relationships derived from monthly mean data. The results suggests that there is an interaction between intensifying distal troughs in the circumpolar westerlies and troughs in the easterlies such that perturbational energy released into the easterlies is propagated through amplification of downstream troughs and ridges. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1960
- Accession Number
- AD0253496
Entities
People
- M.m. Orgill