
Interdecadal variations in the interannual relationship between tropical Pacific SST and Arctic sea ice in summer
JiTai GU, Gang ZENG, ZhongXian LI
Prog Geophy ›› 2025, Vol. 40 ›› Issue (1) : 1-10.
Interdecadal variations in the interannual relationship between tropical Pacific SST and Arctic sea ice in summer
The present study investigates the interdecadal change in the interannual relationship between summer Sea Surface Temperature (SST) in the tropical Pacific and the Arctic Sea Ice Concentration (SIC) and its possible mechanism using 1979—2023 monthly SST and SIC data from Hadley Center and atmospheric reanalysis data from NCEP/NCAR. It is found that the relationship between tropical Pacific SST and SIC in Beaufort Sea experienced an obvious interdecadal change from an insignificant correlation to a significant positive correlation around the year 2001. The reason for the change is the strengthened SST anomaly in central tropical Pacific. During the period of 2001—2023, convective activity in central tropical Pacific intensified due to SST anomaly, enhancing Rossby wave propagating from tropic to high-latitude. Enhanced Rossby wave propagation which formed a zonal circulation pattern of "+-+-", creating favorable advection and radiation for SIC anomalies in Beaufort Sea. As a result, SIC in Beaufort Sea shows a significant positive correlation with SST in central tropical Pacific. Besides, we confirm that SST anomaly in central tropical Pacific can only unilaterally influence SIC in Beaufort Sea by using Liang-Kleeman information flow. Before the turning, due to weak SST anomaly in the central tropical Pacific, it is difficult to trigger a wave train reaching high latitudes, resulting in the correlation between SST in tropical Pacific and SIC in Beaufort Sea remain insignificant.
Tropical Pacific SST / Beaufort Sea / Relationship / Interdecadal change
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Kalnay E, Kanamitsu M, Kistler R, et al. 2018. The NCEP/NCAR 40-year reanalysis project. //Renewable Energy. London: Routledge, 146-194.
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