Effects of vertical wind shear on tropical cyclone rainfall asymmetries over Northern West Pacific

Yanting Ye, Ying Li, Weihua Fang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Vertical wind shear is one of the most important factors contributing to the spatial distribution of Tropical cyclone (TC) rainfall. This study adopts wavenumber-1 Fourier Coefficients to compute the TC rainfall asymmetry caused by environmental shear based on TRMM TMPA rainfall estimates of 439 TCs from 1998 to 2012 over Northern West Pacific basin (NWPAC). The environmental vertical wind shear is defined as the difference of wind vectors between 200- and 850-hPa levels over a region of 200-800km from TC center. It is calculated based on the NCEP reanalysis wind dataset. TCs are divided into groups according to the TC intensity (CMA CAT2, CAT34, CAT56) and environmental shear strength (7.5-10, 10-15 and >15m/s), respectively. The shear-relative asymmetric TC rainfall shows a general left-to-right asymmetry. The positive wavenumber-1 asymmetry rainfall is down-shear left or down-shear for three TC intensity groups, and the maximum asymmetry is down-shear left in the inner 150-km. The magnitude of asymmetry rainfall decreases slightly with the increase of TC intensity. In terms of shear, the positive wavenumber-1 asymmetry is down-shear left especially when shear value >7.5m/s. The amplitude asymmetry increases with the increasing strength of environmental shear.

Original languageEnglish (US)
Title of host publicationAdvances in Energy Science and Environment Engineering II
Subtitle of host publicationProceedings of 2nd International Workshop on Advances in Energy Science and Environment Engineering, AESEE 2018
EditorsFeng Wu, Peijiang Zhou
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735416390
DOIs
StatePublished - Mar 30 2018
Event2018 2nd International Workshop on Advances in Energy Science and Environment Engineering, AESEE 2018 - Zhuhai, China
Duration: Feb 2 2018Feb 4 2018

Publication series

NameAIP Conference Proceedings
Volume1944
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other2018 2nd International Workshop on Advances in Energy Science and Environment Engineering, AESEE 2018
Country/TerritoryChina
CityZhuhai
Period2/2/182/4/18

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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