Research on the effects of the ENSO on Tropical Cyclone Activity of different grades over the western North Pacific

CAO Zhilu; HU Banghui; YANG Xiuqun; WANG Xuezhong; HE Xuesong; TAN Yanke

doi:10.3969/j.issn.0253 4193.2013.02.004

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CAO Zhilu, HU Banghui, YANG Xiuqun, WANG Xuezhong, HE Xuesong, TAN Yanke. Research on the effects of the ENSO on Tropical Cyclone Activity of different grades over the western North Pacific[J]. Haiyang Xuebao, 2013, 35(2): 21-34. doi: 10.3969/j.issn.0253 4193.2013.02.004

Citation:

CAO Zhilu, HU Banghui, YANG Xiuqun, WANG Xuezhong, HE Xuesong, TAN Yanke. Research on the effects of the ENSO on Tropical Cyclone Activity of different grades over the western North Pacific[J]. Haiyang Xuebao, 2013, 35(2): 21-34. doi: 10.3969/j.issn.0253 4193.2013.02.004

Citation:

CAO Zhilu, HU Banghui, YANG Xiuqun, WANG Xuezhong, HE Xuesong, TAN Yanke. Research on the effects of the ENSO on Tropical Cyclone Activity of different grades over the western North Pacific[J]. Haiyang Xuebao, 2013, 35(2): 21-34. doi: 10.3969/j.issn.0253 4193.2013.02.004

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Research on the effects of the ENSO on Tropical Cyclone Activity of different grades over the western North Pacific

doi: 10.3969/j.issn.0253 4193.2013.02.004

1.
64 Subunit 96365 Unit, PLA, Kuerle 841000, China
2.
Institute of Severe Weather and Climate, Nanjing University, Nanjing 210093, China;Institute of Meteorology, PLA Univ. of Sci. &Tech., Nanjing 211101, China
3.
Institute of Severe Weather and Climate, Nanjing University, Nanjing 210093, China
4.
Institute of Meteorology, PLA Univ. of Sci. &Tech., Nanjing 211101, China

Received Date: 2011-01-05
Rev Recd Date: 2012-02-05

Abstract

Abstract

Based on the 1951-2006 best tropical cyclone (TC) track dataset of the Joint Typhoon Warning Center (JJWC) and ENSO-related variables from the Climate Prediction Center (CPC). The relationship between northwestern Pacific accumulated cyclone energy (ACE) of different grades and ENSO are investigated. Results show that: ACE is positively correlated with ENSO indices. Among TC grades, Super-typhoon (SuperTY) contribute most to the relation between ENSO and ACE, the SuperTY amount is more and their lifetime are longer during El Niño episodes than those of La Niña ones. During the peak season of TC, the five-month lag correlation coefficient is almost as large as simultaneous correlation coefficient between the SuperTY ACE and ENSO indices. In addition, the contributions among annual mean TC lifetime, intensity, and amount of different TC grades related to the ENSO signal in ACE are compared, which suggest that the amount of SuperTY is the most important. Following, on the basis of the NCEP reanalysis data on different ENSO phases, the physical mechanism of the effect of ENSO on tropical cyclones of different degrees(especially the high intensity tropical cyclones), were also analyzed.It was concluded that there are some key zones in the Northwestern Pacific Ocean, where the number of the SuperTY in ENSO years is different from that in ordinary years. And ENSO events affect the genesis location and number of SuperTY mainly by changing the low-level relative vorticity and the sea surface temperature in some key zones.
- Accumulated Cyclone Energy(ACE),
- Western North Pacific(WNP),
- TC Intensity,
- ENSO indices,
- key zones

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References(19)

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