文献类型：期刊文献

英文题名：Tropical forcing of East Siberian Sea ice reduction during developing La Nina events

作者：Liu, Junhao[1];Chen, Jiepeng[2,3];Wang, Lei[1];Chen, Sheng[2,3];Weng, Jinwen[1];Wang, Xin[2,3,4];He, Zhuoqi[2,3]

机构：[1]Guangdong Ocean Univ, Coll Ocean & Meteorol, Key Lab Climate Resources & Environm Continental S, Zhanjiang, Peoples R China;[2]Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Peoples R China;[3]Chinese Acad Sci, South China Sea Inst Oceanol, Guangdong Key Lab Ocean Remote Sensing, Guangzhou, Peoples R China;[4]Chinese Acad Sci, South China Sea Inst Oceanol, Global Ocean & Climate Res Ctr, Guangzhou, Peoples R China

年份：2026

卷号：201

外文期刊名：OCEAN MODELLING

收录：SCI-EXPANDED(收录号：WOS:001695980000001)、、WOS

基金：This research was jointly supported by the National Key Research and Development Program of China (2022YFF0801701) , the National Natural Science Foundation of China (42276031) , Science and Technology Projects in Guangzhou (2024A04J9141) , and the Youth Innovation Promotion Association CAS. Author L. W. is supported by the National Natural Science Foundation of China (42575021) and the Innovative Team Plan for Department of Education of Guangdong Province (2023KCXTD015) . Author Z. H. is supported by the National Natural Science Foundation of China (42275035) .

语种：英文

外文关键词：Tropical SST forcing; La Nin a; East Siberian Sea; Sea ice reduction

外文摘要：Arctic summer-autumn sea ice has declined markedly in recent decades, especially in the East Siberian Sea (ESS), a key sector of the Arctic's Northeastern Sea Route. This study demonstrates that developing La Nina events trigger substantial ESS sea-ice loss through a tropical-Arctic teleconnection. Sea surface temperature (SST) anomalies across the tropical oceans excite a Rossby wave train that propagates northward and then eastward, establishing a meridional sea-level pressure dipole-negative over northeastern Russia and positive over the central North Pacific-and driving pronounced southeasterly winds over the ESS. These winds enhance warm-air advection and moisture convergence, increasing downward sensible heat flux and net longwave radiation, which accelerate thermodynamic ice melt. Dynamic ice processes further modulate the response: in the central and northern ESS, ice divergence allows thermodynamics to dominate widespread loss, whereas in the southeastern ESS, ice convergence and positive advection counteract melting, leading to local ice maintenance or gain. CESM2 pacemaker experiments confirm that tropical Pacific SST anomalies dominate the teleconnection, with secondary contributions from the tropical Atlantic and a weaker influence from the Indian Ocean. The results highlight the phase-asymmetric nature of ENSO impacts on Arctic sea ice and provide a mechanistic basis for improving tropical-Arctic linkages in climate models and seasonal prediction.