DOI: 10.1175/JCLI-D-15-0563.1
Scopus记录号: 2-s2.0-84974799207
论文题名: Impacts of vertical structure of convection in global warming: The role of shallow convection
作者: Chen C.-A. ; Yu J.-Y. ; Chou C.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 12 起始页码: 4665
结束页码: 4684
语种: 英语
Scopus关键词: Atmospheric structure
; Climate change
; Climatology
; Convergence of numerical methods
; Dynamics
; Global warming
; Heat convection
; Meteorology
; Tropics
; Associated mechanism
; Atmospheric circulation
; Atmospheric stability
; Circulation changes
; Coupled global climate model
; Precipitation anomalies
; Tropical convection
; Tropical precipitation
; Climate models
; atmospheric circulation
; atmospheric convection
; atmospheric dynamics
; climate change
; climate modeling
; climatology
; global climate
; global warming
; meteorology
英文摘要: Global-warming-induced changes in regional tropical precipitation are usually associated with changes in the tropical circulation, which is a dynamic contribution. This study focuses on the mechanisms of the dynamic contribution that is related to the partition of shallow convection in tropical convection. To understand changes in tropical circulation and its associated mechanisms, 32 coupled global climate models from CMIP3 and CMIP5 were investigated. The study regions are convection zones with positive precipitation anomalies, where both enhanced and reduced ascending motions are found. Under global warming, an upward-shift structure of ascending motion is observed in the entire domain, implying a deepening of convection and a more stable atmosphere, which leads to a weakening of the tropical circulation. In a more detailed examination, areas with enhanced (weakened) ascending motion are associated with more (less) import of moist static energy by a climatologically bottom-heavy (top heavy) structure of vertical velocity, which is similar to a "rich get richer" mechanism. In a warmer climate, different climatological vertical profiles tend to induce different changes in atmospheric stability: The bottom-heavy (top heavy) structure brings a more (less) unstable condition and is favorable (unfavorable) to the strengthening of the convective circulation. The bottom-heavy structure is associated with shallow convection, while the top-heavy structure is usually related to deep convection. This study suggests a hypothesis and a possible linkage for projecting and understanding future circulation change from the current climate: Shallow convection will tend to strengthen tropical circulation and enhance upward motion in a future warmer climate. © 2016 American Meteorological Society. 资助项目: MOST, Ministry of Science and Technology of the People's Republic of China
; MOST, Ministry of Science and Technology of the People's Republic of China
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49915
Appears in Collections: 气候变化事实与影响
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作者单位: Research Center for Environmental Changes, Academia Sinica, Taipei, Taiwan; Department of Atmospheric Sciences, National Central University, Taoyuan City, Taiwan; Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan
Recommended Citation:
Chen C.-A.,Yu J.-Y.,Chou C.. Impacts of vertical structure of convection in global warming: The role of shallow convection[J]. Journal of Climate,2016-01-01,29(12)