DOI: 10.1175/JCLI-D-17-0587.1
Scopus记录号: 2-s2.0-85048180560
论文题名: Understanding Bjerknes compensation in meridional heat transports and the role of freshwater in a warming climate
作者: Yang Q. ; Zhao Y. ; Wen Q. ; Yao J. ; Yang H.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 12 起始页码: 4791
结束页码: 4806
语种: 英语
英文关键词: Climate change
; Climate models
Scopus关键词: Atmospheric temperature
; Climate change
; Climate models
; Global warming
; Heat transfer
; Sea ice
; Surface properties
; Surface waters
; Water
; Atlantic meridional overturning circulations
; Global climate changes
; Global surface temperature
; Meridional heat transports
; North Atlantic Ocean
; Northern Hemispheres
; Ocean heat transport
; Sea surface temperature (SST)
; Oceanography
; air-sea interaction
; climate modeling
; freshwater
; global climate
; global warming
; heat transfer
; meridional circulation
; Northern Hemisphere
; overturn
; sea surface temperature
; water flux
; Atlantic Ocean
; Atlantic Ocean (North)
英文摘要: The Bjerknes compensation (BJC) under global warming is studied using a simple box model and a coupled Earth systemmodel. The BJC states the out-of-phase changes in the meridional atmosphere and ocean heat transports. Results suggest that the BJC can occur during the transient period of global warming.During the transient period, the sea ice melting in the high latitudes can cause a significant weakening of the Atlantic meridional overturning circulation (AMOC), resulting in a cooling in the North Atlantic. The meridional contrast of sea surface temperature would be enhanced, and this can eventually enhance theHadley cell and storm-track activities in the Northern Hemisphere.Accompanied by changes in both ocean and atmosphere circulations, the northward ocean heat transport in the Atlantic is decreased while the northward atmosphere heat transport is increased, and the BJC occurs in the Northern Hemisphere. Once the freshwater influx into the North Atlantic Ocean stops, or the ocean even loses freshwater because of strong heating in the high latitudes, the AMOC would recover. Both the atmosphere and ocean heat transports would be enhanced, and they can eventually recover to the state of the control run, leading to the BJC to become invalid. The above processes are clearly demonstrated in the coupled model CO2 experiment. Since it is difficult to separate the freshwater effect fromthe heating effect in the coupledmodel, a simple boxmodel is used to understand the BJC mechanism and freshwater's role under global warming. In a warming climate, the freshwater flux into the ocean can cool the global surface temperature, mitigating the temperature rise. Box model experiments indicate clearly that it is the freshwater flux into the North Atlantic that causes outof- phase changes in the atmosphere and ocean heat transports, which eventually plays a stabilizing role in global climate change. © 2018 American Meteorological Society.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111541
Appears in Collections: 气候减缓与适应
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作者单位: Laboratory for Climate and Ocean-Atmosphere Studies, Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing, China
Recommended Citation:
Yang Q.,Zhao Y.,Wen Q.,et al. Understanding Bjerknes compensation in meridional heat transports and the role of freshwater in a warming climate[J]. Journal of Climate,2018-01-01,31(12)