Walker circulation response to extratropical radiative forcing

Kang, Sarah M. and Xie, Shang-Ping and Shin, Yechul and Kim, Hanjun and Hwang, Yen-Ting and Stuecker, Malte F. and Xiang, Baoqiang and Hawcroft, Matt (2020) Walker circulation response to extratropical radiative forcing. Science Advances, 6 (47):3021.

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Abstract

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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Distributed under a Creative Commons Attribution Non Commercial License 4.0 (CC BY-NC).
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Applied Climate Sciences (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Applied Climate Sciences (1 Aug 2018 -)
Date Deposited: 26 May 2021 02:56
Last Modified: 31 May 2021 03:01
Uncontrolled Keywords: climate models
Fields of Research (2008): 04 Earth Sciences > 0401 Atmospheric Sciences > 040102 Atmospheric Dynamics
04 Earth Sciences > 0401 Atmospheric Sciences > 040105 Climatology (excl.Climate Change Processes)
04 Earth Sciences > 0401 Atmospheric Sciences > 040103 Atmospheric Radiation
Fields of Research (2020): 37 EARTH SCIENCES > 3702 Climate change science > 370202 Climatology
37 EARTH SCIENCES > 3701 Atmospheric sciences > 370106 Atmospheric radiation
37 EARTH SCIENCES > 3701 Atmospheric sciences > 370105 Atmospheric dynamics
Identification Number or DOI: https://doi.org/10.1126/sciadv.abd3021
URI: http://eprints.usq.edu.au/id/eprint/42026

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