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DOI | 10.1007/s00382-016-3386-y |
Roles of energy conservation and climate feedback in Bjerknes compensation: a coupled modeling study | |
Dai, Haijin1,2; Yang, Haijun1; Yin, Jie1 | |
2017-09-01 | |
发表期刊 | CLIMATE DYNAMICS
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ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2017 |
卷号 | 49 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
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. |
英文关键词 | Energy conservation Climate feedback Bjerknes compensation Atmosphere heattransport Ocean heat transport Coupled model |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000408718200002 |
WOS关键词 | RADIATIVE KERNEL TECHNIQUE ; OCEAN HEAT-TRANSPORT ; ATMOSPHERE ; ITCZ ; FLUX ; ICE ; VARIABILITY ; CIRCULATION ; SENSITIVITY ; AQUAPLANET |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/35582 |
专题 | 气候变化 |
作者单位 | 1.Peking Univ, Sch Phys, Dept Atmospher & Ocean Sci, Lab Climate & Ocean Atmosphere Studies LaCOAS, 209 Chengfu Rd, Beijing 100871, Peoples R China; 2.Natl Univ Def Technol, Acad Ocean Sci & Engn, Changsha, Hunan, Peoples R China |
推荐引用方式 GB/T 7714 | Dai, Haijin,Yang, Haijun,Yin, Jie. Roles of energy conservation and climate feedback in Bjerknes compensation: a coupled modeling study[J]. CLIMATE DYNAMICS,2017,49. |
APA | Dai, Haijin,Yang, Haijun,&Yin, Jie.(2017).Roles of energy conservation and climate feedback in Bjerknes compensation: a coupled modeling study.CLIMATE DYNAMICS,49. |
MLA | Dai, Haijin,et al."Roles of energy conservation and climate feedback in Bjerknes compensation: a coupled modeling study".CLIMATE DYNAMICS 49(2017). |
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