DOI: 10.1007/s00382-016-3386-y
Scopus记录号: 2-s2.0-84991628096
论文题名: Roles of energy conservation and climate feedback in Bjerknes compensation: a coupled modeling study
作者: Dai H. ; Yang H. ; Yin J.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 49, 期: 2017-05-06 起始页码: 1513
结束页码: 1529
语种: 英语
英文关键词: Atmosphere heattransport
; Bjerknes compensation
; Climate feedback
; Coupled model
; Energy conservation
; Ocean heat transport
英文摘要: The roles of energy balance and climate feedback in Bjerknes compensation (BJC) are studied through wind-perturbation experiments in a coupled climate model. Shutting down surface winds over the ocean causes significant reductions in both wind-driven and thermohaline overturning circulations, leading to a remarkable decrease in poleward ocean heat transport (OHT). The sea surface temperature (SST) responds with an increasing meridional gradient, resulting in a stronger Hadley Cell, and thus an enhanced atmosphere heat transport (AHT), compensating the OHT decrease. This is the so-called BJC. Coupled model experiments confirm that the occurrence of BJC is an intrinsic requirement of local energy conservation, and local climate feedback determines the degree of BJC, consistent with our previous theoretical results. Negative (positive or zero) local feedback results in AHT change undercompensating (overcompensating or perfectly compensating) OHT change. Using the radiative kernel technique, the general local feedback between the radiative balance at the top of the atmosphere and surface temperature can be partitioned into individual feedbacks that are related to perturbations in temperature, water vapor, surface albedo, and clouds. We find that the overcompensation in the tropics (extratropics) is mainly caused by positive feedbacks related to water vapor and clouds (surface albedo). The longwave feedbacks related to SST and atmospheric temperature are always negative and strong outside the tropics, well offsetting positive feedbacks in most regions and resulting in undercompensation. Different dominant feedbacks give different BJC scenarios at different regions, acting together to maintain the local energy balance. © 2016, The Author(s). 资助项目: NSFC, National Natural Science Foundation of China
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53085
Appears in Collections: 过去全球变化的重建
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作者单位: Laboratory for Climate and Ocean-Atmosphere Studies (LaCOAS), Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, 209 Chengfu Road, Beijing, China; Academy of Ocean Science and Engineering, National University of Defense Technology, Changsha, Hunan, China
Recommended Citation:
Dai H.,Yang H.,Yin J.. Roles of energy conservation and climate feedback in Bjerknes compensation: a coupled modeling study[J]. Climate Dynamics,2017-01-01,49(2017-05-06)