Quasi-Periodic Intensification of Convective Asymmetries in the Outer Eyewall of Typhoon Lekima (2019)

被引：21

作者：

Dai, Huaning ^{[1
,2
,3
]}

Zhao, Kun ^{[1
,2
,3
]}

Li, Qingqing ^{[4
,5
]}

Lee, Wen-Chau ^{[6
]}

Ming, Jie ^{[1
,2
,3
]}

Zhou, Ang ^{[1
,2
,3
]}

Fan, Xueqi ^{[1
,2
,3
]}

Yang, Zhengwei ^{[1
,2
,3
]}

Zheng, Feng ^{[7
]}

Duan, Yihong ^{[5
]}

机构：

[1] Nanjing Univ, Key Lab Mesoscale Severe Weather MOE, Nanjing, Peoples R China

[2] Nanjing Univ, Sch Atmospher Sci, Nanjing, Peoples R China

[3] Nanjing Univ, Joint Ctr Atmospher Radar Res CMA NJU, Nanjing, Peoples R China

[4] Nanjing Univ Informat Sci & Thchnol, Minist Educ, Key Lab Meteorol Disaster, Nanjing, Peoples R China

[5] Chinese Acad Meteorol Sci, State Key Lab Severe Weather, Beijing, Peoples R China

[6] Natl Ctr Atmospher Res, Earth Observing Lab, POB 3000, Boulder, CO 80307 USA

[7] China Meteorol Adm, Wenzhou Meteorol Bur, Wenzhou, Peoples R China

来源：

GEOPHYSICAL RESEARCH LETTERS | 2021年 / 48卷 / 05期

基金：

中国国家自然科学基金;

关键词：

asymmetric convection; concentric eyewall; vortex Rossby wave; VORTEX ROSSBY-WAVES; SIMULATED TROPICAL CYCLONE; HURRICANE-LIKE VORTICES; CONCENTRIC EYE-WALLS; VERTICAL WIND SHEAR; PART I; POTENTIAL VORTICITY; SPIRAL RAINBANDS; INTENSITY; EVOLUTION;

D O I：

10.1029/2020GL091633

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Typhoon Lekima (2019) possessed a double-eyewall structure before making landfall in eastern China, with its outer eyewall showing quasi-periodic convective intensification. Several physical mechanisms that may cause eyewall convection asymmetries were examined. The upshear occurrence of the strongest convection could not be explained by either the typhoon's motion or the effect of descending inflow from outer rainbands. Radar reflectivity analysis showed that phase locking occurred between the wavenumber-2 vortex Rossby waves (VRWs) propagating radially outward from the inner eyewall and the azimuthally propagating wavenumber-1 VRWs on the inner edge of the outer eyewall. Additional phase locking further arose between the aforementioned wavenumber-1 VRWs and the azimuthally propagating wavenumber-2 VRWs on the outer edge of the outer eyewall. These two phase-locking processes led to the pronounced quasi-periodic intensification of the convective asymmetry in the western semicircle of Lekima's outer eyewall.

引用

页数：9

共 59 条

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