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KMID : 1024520150240111371
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Journal of the Environmental Sciences
2015 Volume.24 No. 11 p.1371 ~ p.1384
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Change in Western Pacific Tropical Cyclone Activity by Western North Pacific Teleconnection Pattern
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Choi Jae-Won
Kim Jeoung-Yun
Lee Seung-Wook
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Abstract
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This study analyzes the characteristics of Western North Pacific (WNP) tropical cyclone (TC) activity and large-scale environments according to the Western Pacific (WP) teleconnection pattern in summer. In the positive WP phase, an anomalous cyclone and an anomalous anticyclone develop in the low and middle latitudes of the East Asia, respectively. As a result, southeasterlies are reinforced in the northeast area of the East Asia including Korea and Japan which facilitates the movement of TC to this area, whereas northwesterlies are reinforced in the southwest area of the East Asia including South China and Indochina Peninsula which blocks the movement of TC to this area. Due to the spatial distribution of this reinforced pressure system, TCs develop, move, and turn more to the northeast of WNP than those in the negative WP phase. Consequently, the characteristics of this TC activity in the positive WP phase are associated with the location of upper tropospheric jet further to the northeast. Meanwhile, TCs in the negative WP phase mainly move to the west from Philippines toward south China and Indochina Peninsula. Furthermore, due to the terrain effect caused by the high passage frequency of TCs in the mainland China, the intensity of TCs are weaker than those in the positive WP phase.
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KEYWORD
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Western Pacific teleconnection pattern, Tropical cyclone, Large-scale environments, East Asia, Upper tropospheric jet
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