Antarctic Summer Sea Ice Trend in the Context of High-Latitude Atmospheric Circulation Changes

被引:13
作者
Yu, Lejiang [1 ,2 ]
Zhong, Shiyuan [2 ]
Zhou, Mingyu [1 ,3 ]
Sun, Bo [1 ]
Lenschow, Donald H. [4 ]
机构
[1] Polar Res Inst China, State Ocean Adm Key Lab Polar Sci, Shanghai, Peoples R China
[2] Michigan State Univ, Dept Geog Environm & Spatial Sci, E Lansing, MI 48824 USA
[3] Natl Marine Environm Predict Ctr, Beijing, Peoples R China
[4] Natl Ctr Atmospher Res, POB 3000, Boulder, CO 80307 USA
关键词
Atmosphere-ocean interaction; Sea state; Climate change; Climate variability; Ice loss; growth; SELF-ORGANIZING MAPS; SOUTHERN-OCEAN; LONG-TERM; CLIMATE; IMPACTS; TELECONNECTION; VARIABILITY; PERFORMANCE; EXTRACTION; EXPANSION;
D O I
10.1175/JCLI-D-17-0739.1
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
The potential mechanisms underlying the observed increasing trend in Antarctic summertime sea ice cover for the 1979-2017 period have been investigated using a relatively novel method called the self-organizing map (SOM). Among the nine nodes generated to explain the variability of Antarctic sea ice cover, two (nodes 3 and 7) exhibit a statistically significant linear trend in the time series of the frequency of the SOM pattern occurrence that together explain 40% of the total trend in the sea ice cover. These two nodes have completely opposite spatial patterns and directions of trend and are associated with different atmospheric circulation patterns. Node 3, which represents an increase in sea ice over the Weddell Sea and the eastern Ross Sea and a decrease over the other coastal seas of West Antarctica, appears to be related to the positive phase of the southern annular mode (SAM) linked with the La Nina pattern of sea surface temperature (SST) over the tropical Pacific Ocean. The opposite spatial pattern and trend represented by node 7 is associated with a wave train originating over northern Australia. The anomalous wind field, surface downward longwave radiation, and surface air temperature generated by these circulation patterns are consistent with the spatial pattern and overall trends in the Antarctic sea ice cover.
引用
收藏
页码:3909 / 3920
页数:12
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