DOI: 10.1007/s00382-014-2077-9
Scopus记录号: 2-s2.0-84893194592
论文题名: Role of synoptic-scale forcing in cyclogenesis over the Bay of Bengal
作者: Akter N. ; Tsuboki K.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 43, 期: 2017-09-10 起始页码: 2651
结束页码: 2662
语种: 英语
英文关键词: Bay of Bengal
; Bimodal cyclone seasons
; Convective inhibition
; Cyclogenesis
; Dry air forcing
; Monsoon trough
英文摘要: The cyclone frequency distribution over the Bay of Bengal during 1990–2009 was distinctly bimodal, with a primary post-monsoon peak and a secondary pre-monsoon peak, despite the very high convective available potential energy (CAPE) during the pre-monsoon. The location of the monsoon trough over the bay is a primary factor in tropical cyclogenesis. Because the trough was in the northernmost bay during the pre-monsoon season, cyclogenesis was inactive in the southern bay, where a strong southwesterly wind shear was found. In this season, moreover, a hot, dry air mass extending vertically from 950 to 600 hPa was advected from northwestern India toward the bay. Moist, warm southwesterly winds penetrating below the deep, dry air mass caused a prominent dryline to form aloft on the northwestern side of the bay. The synoptic-scale hot, dry air forcing to the bay suppressed the active convection necessary for cyclogenesis. The strength of the stable environmental layer, represented by convective inhibition (CIN), was extremely large, and acted as a cap over the northern and northwestern bay. Conversely, during the post-monsoon, there were no horizontal temperature or moisture gradients, and CAPE and CIN were fairly modest. The entire bay was covered by a very deep, moist layer from the surface to 700 hPa transported from the east. The monsoon trough position and the environmental CIN in combination can explain the lower frequency of cyclogenesis during the pre-monsoon compared with the post-monsoon season. © 2014, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54354
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Physics, Bangladesh University of Engineering and Technology, Dhaka, Bangladesh; Hydrospheric Atmospheric Research Center, Nagoya University, Nagoya, Japan; Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Research Institute for Global Change (RIGC), Yokohama, Japan
Recommended Citation:
Akter N.,Tsuboki K.. Role of synoptic-scale forcing in cyclogenesis over the Bay of Bengal[J]. Climate Dynamics,2014-01-01,43(2017-09-10)