North Indian Ocean tropical cyclone activity in CMIP5 experiments: Future projections using a model-independent detection and tracking scheme

被引：31

作者：

Bell, Samuel S. ^{[1
]}

Chand, Savin S. ^{[1
]}

Tory, Kevin J. ^{[2
]}

Ye, Hua ^{[2
]}

Turville, Chris ^{[1
]}

机构：

[1] Federat Univ Australia, Ctr Informat & Appl Optimizat, Ballarat, Vic, Australia

[2] Bur Meteorol, Res & Dev Branch, Melbourne, Vic, Australia

来源：

INTERNATIONAL JOURNAL OF CLIMATOLOGY | 2020年 / 40卷 / 15期

关键词：

Arabian Sea; Asian monsoon; Bay of Bengal; climate change; model projection; North Indian Ocean; track; tropical cyclone; CLIMATE MODEL; FREQUENCY; STORMS; VARIABILITY; BENGAL; BAY;

D O I：

10.1002/joc.6594

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

The sensitivity of tropical cyclone (TC) projection results to different models and the detection and tracking scheme used is well established. In this study, future climate projections of TC activity in the North Indian Ocean (NIO) are assessed with a model- and basin-independent detection and tracking scheme. The scheme is applied to selected models from the coupled model intercomparison project phase 5 (CMIP5) experiments forced under the historical and representative concentration pathway 8.5 (RCP8.5) conditions. Most models underestimated the frequency of early season (April-June) TCs and contained genesis biases equatorward of similar to 7.5 degrees N in comparison to the historical records. TC tracks detected in reanalysis and model data were input to a clustering algorithm simultaneously, with two clusters in the Arabian Sea and two in the Bay of Bengal (k = 4). Projection results indicated a slight decrease of overall TC genesis frequency in the NIO, with an increase of TC genesis frequency in the Arabian Sea (30-64%) and a decrease in the Bay of Bengal (22-43%), consistent between clusters in each of these sub-regions. These changes were largely due to changes in the pre-monsoon season (April-June) where Bay of Bengal TCs significantly decreased, consistent with changes in vertical ascent. Northern Arabian Sea TCs significantly increased during the pre-monsoon season, consistent with changes in vertical wind shear and relative humidity. There was a projected increase of TC frequency in the postmonsoon season (October-December), consistent with changes in relative humidity and vertical ascent, although not all clusters followed this trend; noting a different response in the southern Bay of Bengal. In turn, these projections caused changes to the climate averaged TC track density, including a decrease (up to 2 TCs per decade) affecting the eastern coast of India and a small increase (up to 0.5 TCs per decade) affecting eastern Africa, Oman and Yemen.

引用

页码：6492 / 6505

页数：14

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