DOI: 10.1175/JCLI-D-16-0324.1
Scopus记录号: 2-s2.0-85008178824
论文题名: Coupled high-latitude climate feedbacks and their impact on atmospheric heat transport
作者: Feldl N. ; Bordoni S. ; Merlis T.M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 1 起始页码: 189
结束页码: 201
语种: 英语
Scopus关键词: Atmospheric movements
; Feedback
; Heat transfer
; Solar radiation
; Tropics
; Uncertainty analysis
; Anthropogenic warming
; Circulation changes
; Climate sensitivity
; Energy transport
; Hadley circulation
; Hydrological cycles
; Ice-free conditions
; Systematic variation
; Climate change
英文摘要: The response of atmospheric heat transport to anthropogenic warming is determined by the anomalous meridional energy gradient. Feedback analysis offers a characterization of that gradient and hence reveals how uncertainty in physical processes may translate into uncertainty in the circulation response. However, individual feedbacks do not act in isolation. Anomalies associated with one feedback may be compensated by another, as is the case for the positive water vapor and negative lapse rate feedbacks in the tropics. Here a set of idealized experiments are performed in an aquaplanet model to evaluate the coupling between the surface albedo feedback and other feedbacks, including the impact on atmospheric heat transport. In the tropics, the dynamical response manifests as changes in the intensity and structure of the overturning Hadley circulation. Only half of the range of Hadley cell weakening exhibited in these experiments is found to be attributable to imposed, systematic variations in the surface albedo feedback. Changes in extratropical clouds that accompany the albedo changes explain the remaining spread. The feedback-driven circulation changes are compensated by eddy energy flux changes, which reduce the overall spread among experiments. These findings have implications for the efficiency with which the climate system, including tropical circulation and the hydrological cycle, adjusts to high-latitude feedbacks over climate states that range from perennial or seasonal ice to ice-free conditions in the Arctic. © 2017 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49742
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Earth and Planetary Sciences, University of California, Santa Cruz, Santa Cruz, CA, United States; Environmental Science and Engineering, California Institute of Technology, Pasadena, CA, United States; Department of Atmospheric and Oceanic Sciences, McGill University, Montreal, QC, Canada
Recommended Citation:
Feldl N.,Bordoni S.,Merlis T.M.. Coupled high-latitude climate feedbacks and their impact on atmospheric heat transport[J]. Journal of Climate,2017-01-01,30(1)