DOI: 10.1175/JCLI-D-11-00627.1
Scopus记录号: 2-s2.0-84874797636
论文题名: Bimodal character of cyclone climatology in the bay of bengal modulated by monsoon seasonal cycle
作者: Li Z. ; Yu W. ; Li T. ; Murty V.S.N. ; Tangang F.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 3 起始页码: 1033
结束页码: 1046
语种: 英语
Scopus关键词: Annual cycle
; Atmosphere-ocean interactions
; Bay of Bengal
; Bimodal characters
; Boreal Spring
; Combined effect
; Cyclogenesis/cyclolysis
; Cyclone climatology
; Cyclone intensifications
; Environmental conditions
; Environmental parameter
; Intraseasonal oscillations
; Monsoon onset
; NCEP reanalysis
; Ocean heat content
; Relative contribution
; Relative humidity effects
; Seasonal changes
; Seasonal cycle
; Single peak
; Tropical cyclone
; Vertical shear
; Atmospheric thermodynamics
; Climate change
; Storms
; Shear flow
; air-sea interaction
; climatology
; cyclogenesis
; data set
; monsoon
; relative humidity
; sea surface temperature
; tropical cyclone
; vorticity
; Bay of Bengal
; Indian Ocean
英文摘要: The annual cycle of tropical cyclone (TC) frequency over the Bay of Bengal (BoB) exhibits a notable bimodal character, different from a single peak in other basins. The causes of this peculiar feature were investigated through the diagnosis of a genesis potential index (GPI) with the use of the NCEP Reanalysis I dataset during the period 1981-2009. A methodology was developed to quantitatively assess the relative contributions of four environmental parameters. Different from a conventional view that the seasonal change of vertical shear causes the bimodal feature, it was found that the strengthened vertical shear alone from boreal spring to summer cannot overcome the relative humidity effect. It is the combined effect of vertical shear, vorticity, and SST that leads to the GPI minimum in boreal summer. It is noted that TC frequency in October-November is higher than that in April-May, which is primarily attributed to the difference of mean relative humidity between the two periods. In contrast, more supercyclones (category 4 or above) occur in April-May than in October-November. It is argued that greater ocean heat content, the first branch of northward-propagating intraseasonal oscillations (ISOs) associated with the monsoon onset over the BoB, and stronger ISO intensity in April-May are favorable environmental conditions for cyclone intensification. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52022
Appears in Collections: 气候变化事实与影响
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作者单位: Center for Ocean and Climate Research, First Institute of Oceanography, SOA, Qingdao, China; IPRC, and Department of Meteorology, University of Hawaii at Manoa, Honolulu, HI, United States; Regional Centre, National Institute of Oceanography, Visakhapatnam, India; Research Centre for Tropical Climate Change System, Universiti Kebangsaan Malaysia, Bangi Selangor, Malaysia
Recommended Citation:
Li Z.,Yu W.,Li T.,et al. Bimodal character of cyclone climatology in the bay of bengal modulated by monsoon seasonal cycle[J]. Journal of Climate,2013-01-01,26(3)