How Has the Ferrel Cell Contributed to the Maintenance of Antarctic Sea Ice at Low Levels From 2016 to 2022?

Author:

Wang Shaoyin12ORCID,Liu Jiping23ORCID,Wei Zixin12ORCID,Yang Dongxia4,Li Hua5ORCID,Ding Suoyi6ORCID,Hui Fengming12ORCID,Cheng Xiao12

Affiliation:

1. School of Geospatial Engineering and Science Sun Yat‐sen University, and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) Zhuhai China

2. Key Laboratory of Comprehensive Observation of Polar Environment (Sun Yat‐sen University), Ministry of Education Zhuhai China

3. School of Atmospheric Sciences Sun Yat‐sen University Zhuhai China

4. Analycia Pty. Ltd Melbourne VIC Australia

5. Key Laboratory of Hydrometeorological Disaster Mechanism and Warning of Ministry of Water Resources/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science & Technology Nanjing China

6. Department of Atmospheric and Oceanic Sciences Fudan University Shanghai China

Abstract

AbstractThis study investigates the specific circulation anomalies that have sustained the low Antarctic sea ice state since 2016. Firstly, we find a significant strengthening and southward shift in the Ferrel Cell (FC) during 2016–2022, resulting in a marked increase in southward transport of heat and moisture. Secondly, this enhanced FC is closely associated with a stronger mid‐latitude wave pattern. This pattern is zonally asymmetric and greatly amplifies the poleward advections of heat and moisture, leading to the increased downward longwave radiation, more liquid precipitation and sea ice retreat in specific regions, including the western Pacific and Indian Ocean sectors, Ross and northern Weddell Seas. The mechanism deduced from the short‐term period is further supported by the results of 40 ensemble members of simulations. The southward expansion of the FC and sea ice decline are closely linked to La Niña‐like conditions but may also be driven by anthropogenic global warming.

Funder

Major Research Plan

National Key Research and Development Program of China

National Natural Science Foundation of China

Publisher

American Geophysical Union (AGU)

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