Effects of Vertical Wind Shear on Tropical Cyclone Rainfall Asymmetries over Northern West Pacific

被引：2
作者：
Ye, Yanting [1 ,2 ,3 ,4 ]
Li, Ying [5 ]
Fang, Weihua [1 ,2 ,3 ,4 ]
机构：
[1] Beijing Normal Univ, State Key Lab Earth Surface Proc & Resources Ecol, Beijing 100875, Peoples R China
[2] Beijing Normal Univ, Fac Geog Sci, Beijing 10087, Peoples R China
[3] Beijing Normal Univ, Minist Civil Affairs, Acad Disaster Reduct & Emergency Management, Beijing 100875, Peoples R China
[4] Beijing Normal Univ, Minist Educ, Beijing 100875, Peoples R China
[5] Zhejiang Inst Meteorol Sci, Hangzhou 310008, Zhejiang, Peoples R China
来源：
ADVANCES IN ENERGY SCIENCE AND ENVIRONMENT ENGINEERING II | 2018年 / 1944卷
关键词：
INTENSITY;
D O I：
10.1063/1.5029737
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
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 200-800 km 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 >15 m/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 >7.5 m/s. The amplitude asymmetry increases with the increasing strength of environmental shear.
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页数：6
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