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Weakened relationship between ENSO and Antarctic sea ice in recent decades

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Abstract

The dominant mode of interannual variability in the Antarctic sea ice is presented by a significant seesaw structure with an out-of-phase relationship between the sea ice anomaly in the Ross-Amundsen Sea and the Weddell Sea around the Antarctic continent, which is commonly called the “Antarctic dipole” (ADP). The present work shows that the relationship of El Niño-Southern Oscillation (ENSO) during its mature phase and the ADP in the subsequent austral cold season (June to November) underwent a significant decadal shift around the early 2000s with the correlation coefficients between them being reduced from 0.72 in 1979–2001 to 0.21 in 2002–2020. Further study suggests that this decadal shift is mainly due to the different responses of sea surface temperature (SST) in the Tasman Sea to ENSO. Before the early 2000s, the SST around the Tasman Sea was highly responsive to ENSO variability. Such SST anomalies persisted to the subsequent austral cold season and stimulated a downstream wave train similar to the Pacific South American pattern (PSA). Subsequently, a dipole pattern was induced with water vapor convergence (divergence) over the Ross-Amundsen Sea (the Weddell Sea), causing more (less) downward longwave radiation over there. Consequently, decreased (increased) SIC anomaly occurred in the Ross-Amundsen Sea (the Weddell Sea), favoring the formation of the ADP. After the early 2000s, the SST anomalies in the Tasman Sea in response to ENSO reduced notably, and therefore there was no significant ENSO signal transmitting to the ADP region to influence the sea ice change over there, resulting in the weakening of the ENSO-ADP relationship.

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Data availability statement

The data that support the findings of this study is public and freely available. Monthly sea ice concentration (SIC) data is available at https://nsidc.org/data/NSIDC-0051/versions/1. The atmospheric circulation data is available at https://cds.climate.copernicus.eu/cdsapp#!/dataset/reanalysis-era5-pressure-levels-monthlymeans?%20tab=form%26tab=overview. Monthly sea surface temperature is available at https://www.esrl.noaa.gov/psd/data/gridded/data.noaa.ersst.v5.html. Monthly mean sea surface height data is available at https://www.psl.noaa.gov/data/gridded/data.godas.html.

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Acknowledgements

The authors thank the constructive comments from three anonymous reviewers, which help greatly to improve the manuscript. This research was jointly supported by the National Key Research and Development Program of China (2019YFC1509105) and the National Natural Science Foundation of China (41790472).

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  1. Department of Atmospheric and Oceanic Sciences Institute of Atmospheric Sciences, Fudan University, Shanghai, 200438, China

    Juan Dou & Renhe Zhang

  2. State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China

    Juan Dou

  3. CMA-FDU Joint Laboratory of Marine Meteorology, Shanghai, 200438, China

    Renhe Zhang

  4. Innovation Center of Ocean and Atmosphere System, Zhuhai Fudan Innovation Research Institute, Zhuhai, China

    Renhe Zhang

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Dou, J., Zhang, R. Weakened relationship between ENSO and Antarctic sea ice in recent decades. Clim Dyn 60, 1313–1327 (2023). https://doi.org/10.1007/s00382-022-06364-4

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