PRELIMINARY ANALYSIS OVER OLR FIELDS EFFECTING YEAR-FREQUENCY OF TROPICAL CYCLONE ABNORMALITY IN FUJIAN
GAO Jian-yun
LI Yong-yao
SONG De-zhong
Abstract：Using OLR (outer long-wave radiation) fields observed by NOAA during the period between 1974 and 1997, locations and intensities of ITCZ and subtropical high over the west Pacific denoted by OLR feature quantity are obtained by feature analysis. The result shows that in years of negative anomalous frequency of tropical cyclones in Fujian, ITCZ and the subtropical high lie in more southern location and both are weaker, and vice versa, in terms of the relations between year-frequency of tropical cyclones and ITCZ and the subtropical high.And the early-time OLR features indicate that the field allocation in years of negative anomalous frequency of TC is always an opposite one in years of positive anomalous frequency of TC in the Pacific. That is, in years of negative anomalous frequency of TC negative anomalies cover the tropical west Pacific and the tropical middle Pacific while positive anomalies cover the tropical middle Pacific in years of positive anomalous frequency of TC.
Keywords：Tropic cycloneabnormalityOLR fieldsfeature analysis
Publication Date：2000-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 225-231 )