期刊
INTERNATIONAL JOURNAL OF CLIMATOLOGY
卷 41, 期 -, 页码 E2700-E2717出版社
WILEY
DOI: 10.1002/joc.6875
关键词
Arctic sea ice concentration; high-pressure ridge over Ural mountain; interdecadal change; North Atlantic Sea surface temperature; Siberian High
资金
- National Natural Science Foundation of China [41530425, 41775080, 41721004, 41605050]
It was found in the study that the connection between autumn Arctic sea ice concentration and winter Siberian High weakened significantly after the late-1990s, primarily due to the decrease in Arctic warming and atmospheric anomalies over Eurasia. Additionally, changes in the North Atlantic sea surface temperature anomaly pattern from autumn to winter also played a role in strengthening the Siberian High via modulation of the Ural high-pressure ridge.
Previous studies suggested that autumn Arctic sea ice concentration (SIC) change around the Kara-Laptev seas has a marked impact on the following winter Siberian High (SH). This analysis reveals that the autumn Arctic SIC-winter SH connection experienced a marked interdecadal weakening around the late-1990s according to observational and reanalysis data. Before the late-1990s, autumn Arctic SIC loss induces pronounced Arctic warming via modulating surface heat fluxes and reduces poleward meridional temperature gradient, which leads to weakening of westerly winds over mid-latitude Eurasia and contributes to formation of a high-pressure ridge around Ural mountain. The Ural high-pressure ridge provides a favourable dynamical condition for the amplification of SH. Consequently, the autumn Arctic SIC-winter SH connection is strong. In addition, the North Atlantic is dominated by a marked triple sea surface temperature anomaly pattern from autumn to winter, which also partly contributes to a strengthened SH via modulating the Ural high-pressure ridge. After the late-1990s, Arctic warming and atmospheric anomalies over Eurasia related to the autumn Arctic SIC loss are much weaker. Accordingly, the autumn Arctic SIC-winter SH connection is very weak. Changes in the autumn Arctic SIC-related Arctic warming and atmospheric anomalies are suggested to be related to differences in the autumn Arctic SIC anomalies, with a much weaker amplitude and northward retreat after than before the late-1990s. Further analysis indicates that the weaker autumn Arctic SIC anomalies over Kara-Laptev seas after the late-1990s is related to the northward retreat of the mean Arctic SIC.
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