The key role of coupled chemistry-climate interactions in tropical stratospheric temperature variability

Yook, Simchan, Thompson, David W. J., Solomon, Susan and Kim, Seo-Yeon (2020) The key role of coupled chemistry-climate interactions in tropical stratospheric temperature variability. Journal of Climate, 33 (17). 7619–7629. ISSN 0894-8755

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Abstract

The purpose of this study is to quantify the effects of coupled chemistry–climate interactions on the amplitude and structure of stratospheric temperature variability. To do so, the authors examine two simulations run on version 4 of the Whole Atmosphere Coupled Climate Model (WACCM): a “free-running” simulation that includes fully coupled chemistry–climate interactions and a “specified chemistry” version of the model forced with prescribed climatological-mean chemical composition. The results indicate that the inclusion of coupled chemistry–climate interactions increases the internal variability of temperature by a factor of ~2 in the lower tropical stratosphere and—to a lesser extent—in the Southern Hemisphere polar stratosphere. The increased temperature variability in the lower tropical stratosphere is associated with dynamically driven ozone–temperature feedbacks that are only included in the coupled chemistry simulation. The results highlight the fundamental role of two-way feedbacks between the atmospheric circulation and chemistry in driving climate variability in the lower stratosphere.

Item Type: Article
Additional Information: Acknowledgments: The authors thank Stephan Fueglistaler and two anonymous reviewers for their helpful comments on the manuscript. D.W.J.T. and S.Y. are partly funded by NSF Climate and Large-Scale Dynamics (AGS-1848785). S.S. is partly supported by NSF Climate and Large-Scale Dynamics (AGS-1848863). The CESM project is supported by the NSF and the Office of Science (BER) of the U.S. Department of Energy (DOE). The authors acknowledge the Climate Simulation Laboratory at NCAR’s Computational and Information Systems Laboratory (CISL; sponsored by NSF and other agencies) and the NOAA Research and Development High Performance Computing Program for providing computing and storage resources that have contributed to the research results reported within this paper.
Uncontrolled Keywords: atmospheric circulation,stratosphere,ozone,radiation budgets,climate variability,interannual variability,sdg 13 - climate action ,/dk/atira/pure/sustainabledevelopmentgoals/climate_action
Faculty \ School: Faculty of Science > School of Environmental Sciences
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Depositing User: LivePure Connector
Date Deposited: 06 Jun 2022 15:30
Last Modified: 13 Jun 2022 12:30
URI: https://ueaeprints.uea.ac.uk/id/eprint/85368
DOI: 10.1175/JCLI-D-20-0071.1

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