Characteristics of Extratropical Transitional Typhoons from 1949 to 2014 Affecting Shandong Province
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Abstract:
By using the 1949-2014 “Typhoon Annuals” compiled by the Shanghai Typhoon Institute, conventional precipitation, wind, and daily mean NCEP (25°×25°) reanalysis data, all extratropical transitional typhoons affecting Shandong are found and their spatialtemporal distributive climatic characteristics are analyzed.The results show that: from 1949 to 2014, there are 80 extratropical transitional typhoons affected Shandong. Typhoon transition occurs mainly in the middle latitudes. The number of extratropical transitional typhoons has obvious interdecadal variation and annual variation. The transitional typhoons mainly appear in summer and autumn, and relatively rare in spring and winter. The location of typhoon transition is related to the subtropical high and middle latitude westerly trough. There are obvious front areas when typhoons transit, and the intensity of the front zones is positively related to the number of the transitional typhoons. There are 33 typhoons transited and enhanced, in which the baroclinic frontal zone, cold air, cold air inclining from the middle and upper levels and sinking, upperlevel positive vorticity advection, and lowlevel warm advection are important factors beneficial to the strengthening of transitional typhoons.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.