West North Pacific typhoon track patterns and their potential connection to Tibetan Plateau snow cover |
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| Authors: | Lian Xie Tingzhuang Yan |
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| Institution: | (1) Department of Marine, Earth and Atmospheric Sciences, North Carolina State University, Raleigh, NC 27695-8208, USA |
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| Abstract: | The spatial characteristics and temporal variability of the West North Pacific (WNP) typhoon tracks are studied by analyzing
the spatial pattern and temporal variability of the empirical orthogonal functions (EOFs) of the WNP typhoon track density
function (TTDF) from 1945 to 2004. The results show that WNP typhoon tracks exhibit three principal EOF Modes. The first EOF
Mode represents the contrasting “active” versus “inactive” typhoons defined by the overall frequency and life span of the
typhoons that develop in the WNP basin. The second EOF shows a north–south dipole Mode in the TTDF depicting a seesaw pattern
in typhoon frequency between Northeast Asia and Southeast Asia. The third EOF describes an east–west dipole Mode in TTDF depicting
a zonal seesaw pattern between typhoons that tend to make landfalls in East Asia and typhoons that tend to stay away from
the East Asia landmasses. Further analysis of the EOF time series of the WNP TTDF indicates that an important climatic factor
associated with the WNP typhoon activity is the snow cover over the Tibetan Plateau (TP), which is also correlated with the
East Asia summer monsoon (EASM). Thus, a mechanism linking the TP snow cover and the WNP typhoon activity is the response
of the EASM in the WNP region to the TP snow cover, and the subsequent effect of EASM on the development and steering of the
WNP typhoons. |
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| Keywords: | Climate variability TP snow cover Typhoon Western North Pacific/East Asian summer monsoon |
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