Frequent central Pacific La Ni?a events may accelerate Arctic warming since the 1980s |
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| Authors: | Jing Li Lin Mu Linhao Zhong |
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| Institution: | 1.College of Life Sciences and Oceanography, Shenzhen University, Shenzhen 518060, China2.College of Marine Science and Technology, China University of Geosciences, Wuhan 430074, China3.Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China4.CAS Key Laboratory of Regional Climate-Environment for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | Including significant warming trend, Arctic climate changes also exhibit strong interannual variations in various fields, which is suggested to be related to El Ni?o and Southern Oscillation (ENSO) events. Previous studies have demonstrated the different impacts on the Arctic of central Pacific (CP) and eastern Pacific (EP) ENSO events, and suggested these impacts are largely of opposite sign for ENSO warm and cold phases. Our results illustrate asymmetrical changes for the cold and warm ENSO events, especially for the La Ni?a events. Compared to the past frequent basin-wide cooling La Ni?a events, since the 1980s the cooling center for the La Ni?a event has strengthened and moved westward along with the increasing frequency for the canonical and CP La Ni?a events. Contrary to the basin-wide cooling and canonical La Ni?a events, the frequent CP La Ni?a events induce significant warming from the Beaufort Sea to Greenland via the convection center moving northward over the western Pacific. Observation analysis and numerical experiments both suggest that the changes in La Ni?a type may also accelerate Arctic warming. |
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| Keywords: | ENSO diversity La Ni?a type the Arctic warming |
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