Authors: KyungJa Ha SoonJo Yoon KyungSook Yun JongSeong Kug YeonSoo Jang Johnny C L Chan
Publish Date: 2012/01/27
Volume: 109, Issue: 3-4, Pages: 383-395
Abstract
The effects of the El NiñoSouthern Oscillation ENSO phase and the shifting of the ENSO sea surface temperature SST on the intensity of tropical cyclones TC have been extensively investigated in terms of TC genesis locations in the western North Pacific WNP To advance the hypothesis for a relation of genesis location–intensity that the TC formation location hints its intensity two cases have been compared which include the phase of the decaying El Niño turning over to La Niña type I and the phase that recovers to a neutral condition type II In addition the shift of ENSO SST to the central Pacific warming CPW from the East Pacific warming EPW has been examined The genesis potential index GPI and the accumulated cyclone energy have been applied to compare the differences between the ENSO phase and the TC formation location It was apparent that ENSO influences the WNP typhoon formation location depending on the cycle of the ENSO phase In addition the typhoon activity was affected by the zonal shift of the El Niño SST The CPW which has maximum SST over the central Pacific tends to have a persistently high GPI over the WNP in September–November and June–August demonstrating that the formation locations of strong TCs significantly shift southeastward compared with the EPW having SST maximum over the eastern Pacific CPW years revealed a distinguishable relationship between the TC formation location and the TC between the tropical depression TD + tropical storm TS and the intense typhoon of category 4 + 5
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