DOI: 10.1175/JCLI-D-12-00288.1
Scopus记录号: 2-s2.0-84874803357
论文题名: A radiative-convective equilibrium perspective of weakening of the tropical walker circulation in response to global warming
作者: Huang X. ; Chuang H.-W. ; Dessler A. ; Chen X. ; Minschwaner K. ; Ming Y. ; Ramaswamy V.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 5 起始页码: 1643
结束页码: 1653
语种: 英语
Scopus关键词: Cooling rates
; Lapse rate
; Long-wave radiation
; Model simulation
; Observational analysis
; Planetary boundary layers
; Radiative cooling
; Radiative-convective equilibrium
; Vertical structures
; Vertical velocity
; Walker circulation
; Climate change
; Climate models
; Global warming
; Troposphere
; Computer simulation
; boundary layer
; climate change
; climate modeling
; convective system
; cooling
; general circulation model
; global warming
; longwave radiation
; troposphere
; Walker circulation
英文摘要: Both observational analysis andGCMsimulations indicate that the tropical Walker circulation is becoming weaker and may continue to weaken as a consequence of climate change. Here, the authors use a conceptual radiative-convective equilibrium (RCE) framework to interpret the weakening of the Walker circulation as simulated by the GFDL coupled GCM. Based on the modeled lapse rate and clear-sky cooling rate profiles, the RCE framework can directly compute the change of vertical velocity in the descending branch of the Walker circulation, which agrees with the counterpart simulated by the GFDL model. The results show that the vertical structure of clear-sky radiative cooling rate QR will change in response to the increased water vapor as the globe warms. The authors explain why the change of QR is positive in the uppermost part of the troposphere (<300 hPa) and is negative for the rest of the troposphere. As a result, both the change of clearsky cooling rate and the change of tropospheric lapse rate contribute to the weakening of circulation. The vertical velocity changes due to the two factors are comparable to each other from the top of the planetary boundary layer to 600 hPa. From 600 to 300 hPa lapse rate changes are the dominant cause of the weakening circulation. Above 300 hPa, the change due to QR is opposite to the change due to lapse rate, which forces a slight increase in vertical velocity that is seen in the model simulation. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51989
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Atmospheric, Oceanic, and Space Sciences, University of Michigan, 2455 Hayward St., Ann Arbor, MI 48109-2143, United States; Department of Atmospheric Sciences, Texas A and M University, College Station, TX, United States; Department of Physics, New Mexico Institute of Mining and Technology, Socorro, NM, United States; NOAA, Geophysical Fluid Dynamics Laboratory, Princeton, NJ, United States
Recommended Citation:
Huang X.,Chuang H.-W.,Dessler A.,et al. A radiative-convective equilibrium perspective of weakening of the tropical walker circulation in response to global warming[J]. Journal of Climate,2013-01-01,26(5)