Premonsoon/Postmonsoon Bay of Bengal Tropical Cyclones Intensity: Role of Air-Sea Coupling and Large-Scale Background State

被引：27

作者：

Neetu, S. ^{[1
]}

Lengaigne, M. ^{[2
,3
]}

Vialard, J. ^{[2
]}

Samson, G. ^{[2
,4
]}

Masson, S. ^{[2
]}

Krishnamohan, K. S. ^{[2
]}

Suresh, I ^{[1
]}

机构：

[1] CSIR Natl Inst Oceanog, Panaji, India

[2] Univ Paris 06, Sorbonne Univ UPMC, LOCEAN IPSL, CNRS IRD MNHN, Paris, France

[3] NIO, IISc NIO IITM IRD Joint Int Lab, Indo French Cell Water Sci, Panaji, India

[4] Mercator Ocean, Ramonville St Agne, France

来源：

GEOPHYSICAL RESEARCH LETTERS | 2019年 / 46卷 / 04期

关键词：

tropical cyclones; Bay of Bengal; air-sea coupling; cold wake; coupled ocean-atmosphere model; STORM-SURGE; PREDICTION SCHEME; SUMMER MONSOON; CLIMATE; MODEL; SIMULATION; HURRICANES;

D O I：

10.1029/2018GL081132

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The densely populated Bay of Bengal (BoB) rim witnesses the deadliest tropical cyclones (TCs) globally, before and after the summer monsoon. Previous studies indicated that enhanced salinity and reduced thermal stratification reduce cooling under BoB TCs after the monsoon, suggesting that air-sea coupling may favor stronger TCs during that season. Using observations and simulations from a one fourth degree regional ocean-atmosphere model, we show that BoB TCs are stronger before the monsoon due to a more favorable large-scale background state (less vertical wind shear and higher sea surface temperature). Air-sea coupling however alleviates this background state influence, by reducing the number of premonsoon intense TCs, because of larger cooling and reduced upward enthalpy fluxes below TCs during that season. As the impact of air-sea interactions on BoB TCs is largest for intense TCs, it should be further investigated for Category 3 and above TCs, which are not reproduced at one fourth degree resolution.

引用

页码：2149 / 2157

页数：9