Abstract
We investigate the spatio-temporal characteristics of the austral spring Ross Ice Shelf Polynya (RISP) and its relationship with atmospheric circulation anomalies based on the sea ice concentration data from the National Snow and Ice Data Center (NSIDC) and the ERA5 reanalysis data. The RISP area series is derived by choosing 25% sea ice concentration as the threshold. Then the principal spatial patterns of the RISP are acquired by using the empirical orthogonal function (EOF) analysis. The leading EOF (EOF1) has a spatial distribution of a strong negative core in the northeastern RISP with a weak positive core near the Cape Adare, explaining 48.1% of the variance. This mode matches the wind pattern of the northwesterly on the western Ross Sea while southwesterly on the eastern Ross Sea, which reflects the zonal variation of the RISP. There is also a strong positive correlation between the RISP area and the PC1. The EOF2 explains 27.4% of the variance, and is mainly characterized by a large region of low values in the northwestern Ross Sea with a small region of high value near Cape Colbeck. Matching the strong southerly over the western Ross Sea, the EOF2 partly depicts the meridional variation of the RISP. We further explored the connections between the RISP and sea level pressure, and found that a deeper and more eastward Amundsen Sea Low (ASL) in November often coincides with a larger and more eastward RISP in December. This lagged response is partly generated through the influence of the ASL on the RISP in November.
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Acknowledgements
This study was supported by the National Natural Science Foundation of China (Grant No. 41941008). Data used in this study can be downloaded online (NSIDC: https://nsidc.org/data/G02202/versions/3; ERA5: https://cds.climate.copernicus.eu/cdsapp#!/dataset/reanalysis-era5-single-levels-monthly-means?tab=form). We are grateful to J. Scott Hosking for making the ASL indices data available (ASL indices: https://scotthosking.com/asl_index).
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Wang, T., Wei, H. & Xiao, J. Dynamic linkage between the interannual variability of the spring Ross Ice Shelf Polynya and the atmospheric circulation anomalies. Clim Dyn 58, 831–840 (2022). https://doi.org/10.1007/s00382-021-05936-0
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DOI: https://doi.org/10.1007/s00382-021-05936-0