Memory effects of Eurasian land processes cause enhanced cooling in response to sea ice loss

被引:32
|
作者
Nakamura, Tetsu [1 ]
Yamazaki, Koji [1 ]
Sato, Tomonori [1 ]
Ukita, Jinro [2 ]
机构
[1] Hokkaido Univ, Fac Environm Earth Sci, Sapporo, Hokkaido 0600810, Japan
[2] Niigata Univ, Fac Sci, Niigata 9502181, Japan
关键词
ATMOSPHERIC CIRCULATION; ARCTIC AMPLIFICATION; COLD WINTERS; IMPACTS; CLIMATE; MATTER; MODEL; SST;
D O I
10.1038/s41467-019-13124-2
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Amplified Arctic warming and its relevance to mid-latitude cooling in winter have been intensively studied. Observational evidence has shown strong connections between decreasing sea ice and cooling over the Siberian/East Asian regions. However, the robustness of such connections remains a matter of discussion because modeling studies have shown divergent and controversial results. Here, we report a set of general circulation model experiments specifically designed to extract memory effects of land processes that can amplify sea ice-climate impacts. The results show that sea ice-induced cooling anomalies over the Eurasian continent are memorized in the snow amount and soil temperature fields, and they reemerge in the following winters to enhance negative Arctic Oscillation-like anomalies. The contribution from this memory effect is similar in magnitude to the direct effect of sea ice loss. The results emphasize the essential role of land processes in understanding and evaluating the Arctic-mid-latitude climate linkage.
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页数:8
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