DOI: 10.1002/jgrd.50396
论文题名: Intensification of premonsoon tropical cyclones in the Bay of Bengal and its impacts on Myanmar
作者: Wang S.-Y. ; Buckley B.M. ; Yoon J.-H. ; Fosu B.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 10 起始页码: 4373
结束页码: 4384
语种: 英语
英文关键词: aerosol
; climate change
; extreme
; Myanmar
; pre-monsoon
; tropical cyclone
Scopus关键词: Aerosols
; Atmospheric temperature
; Climate change
; Greenhouse gases
; Hurricanes
; Storms
; Thermal conductivity
; Troposphere
; Anticyclonic anomalies
; Circulation anomalies
; extreme
; Increasing sea-surface temperatures
; Monsoon circulations
; Myanmars
; Pre-monsoon
; Tropical cyclone
; Atmospheric thermodynamics
; aerosol composition
; atmospheric circulation
; climate change
; environmental impact
; monsoon
; regional climate
; tropical cyclone
; trough
; Bay of Bengal
; Indian Ocean
; Myanmar
英文摘要: We analyze multiple global reanalysis and precipitation datasets in order to explain the dynamic mechanisms that lead to an observed intensification of the monsoon trough and associated tropical cyclone (TC) activity over the Bay of Bengal (BOB) during the premonsoon month of May. We find that post-1979 increases in both premonsoon precipitation and TC intensity are a result of enhanced large-scale monsoon circulation, characterized by lower-level cyclonic and upper-level anticyclonic anomalies. Such circulation anomalies are manifest of the tropospheric expansion that is caused by regional warming. The deepened monsoon trough in the BOB not only affects TC frequency and timing, but also acts to direct more cyclones towards Myanmar. We propose that increasing sea surface temperature in the BOB has contributed to an increase in cyclone intensity. Our analyses of the Community Earth System Model single-forcing experiments suggest that tropospheric warming and a deepening of the monsoon trough can be explained by two discreet anthropogenic causes-an increase in absorption due to aerosol loading and an increase in the land-ocean thermal contrast that results from increased greenhouse gases. The ensuing circulation changes provide favorable conditions for TCs to grow and to track eastward towards Myanmar. Key Points Examine dynamic mechanism leading to intensification of monsoon troughIncrease of pre-monsoon precipitation and TCs over MyanmarAttribute to increasing aerosol loading and GHGs ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63753
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Utah Climate Center, Utah State University, 4820 Old Main Hill, Logan, UT 84341, United States; Department of Plants, Soils, and Climate, Utah State University, Logan UT, United States; Lamont-Doherty Earth Observatory, Columbia University, Palisades NY, United States; Pacific Northwest National Laboratory, Richland WA, United States
Recommended Citation:
Wang S.-Y.,Buckley B.M.,Yoon J.-H.,et al. Intensification of premonsoon tropical cyclones in the Bay of Bengal and its impacts on Myanmar[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(10)