Seasonality and El Nino Diversity in the Relationship between ENSO and Western North Pacific Tropical Cyclone Activity SCIE SCOPUS

Cited 7 time in WEB OF SCIENCE Cited 6 time in Scopus
Title
Seasonality and El Nino Diversity in the Relationship between ENSO and Western North Pacific Tropical Cyclone Activity
Author(s)
Choi, Yumi; Ha, Kyung-Ja; Jin, Fei-Fei
KIOST Author(s)
Choi, Yu Mi(최유미)
Publication Year
2019-12
Abstract
Both the impacts of two types of El Nino on the western North Pacific (WNP) tropical cyclone (TC) activity and the seasonality in the relationship between genesis potential index (GPI) and El Nino-Southern Oscillation (ENSO) are investigated. The ENSO-induced GPI change over the northwestern (southeastern) part of the WNP is mostly attributed to the relative humidity (absolute vorticity) term, revealing a distinct meridional and zonal asymmetry in summer and fall, respectively. The seasonal change in ENSO (background states) from summer to fall is responsible for the seasonal change in GPI anomalies south of 20 degrees N (over the northeastern part of the WNP). The downdraft induced by the strong upper-level convergence in the eastern Pacific (EP)-type El Nino and both the northwestward-shifted relative vorticity and northward-extended convection over the southeastern part of the WNP in the central Pacific (CP)-type El Nino lead to distinct TC impacts over East Asia (EA). The southward movement of genesis location of TCs and increased westward-moving TCs account for the enhanced strong typhoon activity for the EP-type El Nino in summer. In fall the downdraft and anomalous anticyclonic steering flows over the western part of the WNP remarkably decrease TC impacts over EA. The enhanced moist static energy and midlevel upward motion over the eastern part of the WNP under the northern off-equatorial sea surface temperature warming as well as longer passage of TCs toward EA are responsible for the enhanced typhoon activity for the CP-type El Nino. It is thus important to consider the seasonality and El Nino pattern diversity to explore the El Nino-induced TC impacts over EA.
ISSN
0894-8755
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/442
DOI
10.1175/JCLI-D-18-0736.1
Bibliographic Citation
JOURNAL OF CLIMATE, v.32, no.23, pp.8021 - 8045, 2019
Publisher
AMER METEOROLOGICAL SOC
Type
Article
Language
English
Document Type
Article
Publisher
AMER METEOROLOGICAL SOC
Related Researcher
Research Interests

Tropical cyclone activity,ENSO diversity,Tropical-extratropical interactions,태풍 장단기 변동성,엘니뇨-남방진동 다양성,적도-중위도 상호작용

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