Walker circulation response to extratropical radiative forcing

被引：0

作者：

Kang, Sarah M. ^{[1
]}

Xie, Shang-Ping ^{[2
]}

Shin, Yechul ^{[1
]}

Kim, Hanjun ^{[1
]}

Hwang, Yen-Ting ^{[3
]}

Stuecker, Malte F. ^{[4
]}

Xiang, Baoqiang ^{[5
,6
]}

Hawcroft, Matt ^{[7
,8
]}

机构：

[1] Ulsan National Institute of Science and Technology, School of Urban and Environmental Engineering, Ulsan, Korea, Republic of

[2] Scripps Institution of Oceanography, University of California San Diego, San diego,CA,92093, United States

[3] Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan

[4] Department of Oceanography and International Pacific Research Center, School of Ocean and Earth Science and Technology, University of Hawai'i at Manoa, Honolulu,HI,96822, United States

[5] NOAA/Geophysical Fluid Dynamics Laboratory, Princeton,NJ,08540, United States

[6] University Corporation for Atmospheric Research, Boulder,CO,80301, United States

[7] University of Southern Queensland, Toowoomba, Australia

[8] Met Office, Exeter, United Kingdom

来源：

Science Advances | 2020年 / 6卷 / 47期

关键词：

Climate models;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Walker circulation variability and associated zonal shifts in the heating of the tropical atmosphere have far-reaching global impacts well into high latitudes. Yet the reversed high latitude-to-Walker circulation teleconnection is not fully understood. Here, we reveal the dynamical pathways of this teleconnection across different components of the climate system using a hierarchy of climate model simulations. In the fully coupled system with ocean circulation adjustments, the Walker circulation strengthens in response to extratropical radiative cooling of either hemisphere, associated with the upwelling of colder subsurface water in the eastern equatorial Pacific. By contrast, in the absence of ocean circulation adjustments, the Walker circulation response is sensitive to the forcing hemisphere, due to the blocking effect of the northward-displaced climatological intertropical convergence zone and shortwave cloud radiative effects. Our study implies that energy biases in the extratropics can cause pronounced changes of tropical climate patterns. Copyright © 2020 The Authors, some rights reserve School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology, Ulsan, South Korea.

引用