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Important role of stratosphere-troposphere coupling in the Arctic mid-to-upper tropospheric warming in response to sea-ice loss

Earth Sciences

Important role of stratosphere-troposphere coupling in the Arctic mid-to-upper tropospheric warming in response to sea-ice loss

M. Xu, W. Tian, et al.

This study reveals a profound connection between Arctic sea-ice loss and mid-to-upper tropospheric warming. Through innovative reanalysis and model simulations, the research conducted by Mian Xu, Wenshou Tian, Jiankai Zhang, James A. Screen, Chongyang Zhang, and Zhe Wang uncovers how changes in sea-ice impact atmospheric dynamics, leading to significant warming events in the Arctic region.

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Playback language: English
Abstract
This study investigates the dynamical mechanism responsible for Arctic mid-to-upper tropospheric warming linked to Arctic sea-ice loss. Using reanalysis and model simulations, the authors demonstrate that Barents-Kara sea-ice loss enhances upward propagating waves, leading to wave convergence anomalies in the sub-polar lower stratosphere and upper troposphere. This results in a clockwise residual overturning anomaly, causing anomalous descent and adiabatic warming in the Arctic mid-to-upper troposphere. Model simulations with suppressed stratospheric variability confirm the crucial role of stratosphere-troposphere coupling in this deep Arctic warming.
Publisher
npj Climate and Atmospheric Science
Published On
Feb 20, 2023
Authors
Mian Xu, Wenshou Tian, Jiankai Zhang, James A. Screen, Chongyang Zhang, Zhe Wang
Tags
Arctic warming
sea-ice loss
atmospheric dynamics
stratosphere-troposphere coupling
wave convergence
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