Walker circulation response to extratropical radiative forcing

Article


Kang, Sarah M., Xie, Shang-Ping, Shin, Yechul, Kim, Hanjun, Hwang, Yen-Ting, Stuecker, Malte F., Xiang, Baoqiang and Hawcroft, Matt. 2020. "Walker circulation response to extratropical radiative forcing." Science Advances. 6 (47). https://doi.org/10.1126/sciadv.abd3021
Article Title

Walker circulation response to extratropical radiative forcing

ERA Journal ID211335
Article CategoryArticle
AuthorsKang, Sarah M. (Author), Xie, Shang-Ping (Author), Shin, Yechul (Author), Kim, Hanjun (Author), Hwang, Yen-Ting (Author), Stuecker, Malte F. (Author), Xiang, Baoqiang (Author) and Hawcroft, Matt (Author)
Journal TitleScience Advances
Journal Citation6 (47)
Article Number3021
Number of Pages8
Year2020
Place of PublicationNew York, United States
ISSN2375-2548
Digital Object Identifier (DOI)https://doi.org/10.1126/sciadv.abd3021
Web Address (URL)https://advances.sciencemag.org/content/advances/6/47/eabd3021.full.pdf
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.

Keywordsclimate models
ANZSRC Field of Research 2020370202. Climatology
370106. Atmospheric radiation
370105. Atmospheric dynamics
Public Notes

Distributed under a Creative Commons Attribution Non Commercial License 4.0 (CC BY-NC).

Byline AffiliationsUlsan National Institute of Science and Technology, Korea
University of California, United States
National Taiwan University, Taiwan
University of Hawaii, United States
National Oceanic and Atmospheric Administration, United States
Centre for Applied Climate Sciences
Institution of OriginUniversity of Southern Queensland
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