典型文献
An Isentropic Mass Circulation View on the Extreme Cold Events in the 2020/21 Winter
文献摘要：
Three extreme cold events successively occurred across East Asia and North America in the 2020/21 winter. This study investigates the underlying mechanisms of these record-breaking persistent cold events from the isentropic mass circulation (IMC) perspective. Results show that the midlatitude cold surface temperature anomalies always co-occurred with the high-latitude warm anomalies, and this was closely related to the strengthening of the low-level equatorward cold air branch of the IMC, particularly along the climatological cold air routes over East Asia and North America. Specifically, the two cold surges over East Asia in early winter were results of intensification of cold air transport there, influenced by the Arctic sea ice loss in autumn. The weakened cold air transport over North America associated with warmer northeastern Pacific sea surface temperatures (SSTs) explained the concurrent anomalous warmth there. This enhanced a wavenumber-1 pattern and upward wave propagation, inducing a simultaneous and long-lasting stronger poleward warm air branch (WB) of the IMC in the stratosphere and hence a displacement-type Stratospheric Sudden Warming (SSW) event on 4 January. The WB-induced increase in the air mass transported into the polar stratosphere was followed by intensification of the equatorward cold branch, hence promoting the occurrence of two extreme cold events respectively over East Asia in the beginning of January and over North America in February. Results do not yield a robust direct linkage from La Ni?a to the SSW event, IMC changes, and cold events, though the extratropical warm SSTs are found to contribute to the February cold surge in North America.
文献关键词：
中图分类号：
作者姓名：
Yueyue YU;Yafei LI;Rongcai REN;Ming CAI;Zhaoyong GUAN;Wei HUANG
作者机构：
Key Laboratory of Meteorological Disaster,Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC–FEMD)/Institute for Climate and Application Research(ICAR),Nanjing University of Information Science and Technology,Nanjing 210044,China;State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG),Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China;Tianjin Meteorological Disaster Defense Technology Centre,Tianjin 300074,China;Department of Earth,Ocean& Atmospheric Sciences,Florida State University,Tallahassee,Florida 32304,USA;Key Laboratory of Mesoscale Severe Weather/Ministry of Education and School of Atmospheric Sciences,Nanjing University,Nanjing 210044,China
文献出处：
引用格式：
[1]Yueyue YU;Yafei LI;Rongcai REN;Ming CAI;Zhaoyong GUAN;Wei HUANG-.An Isentropic Mass Circulation View on the Extreme Cold Events in the 2020/21 Winter)[J].大气科学进展（英文版）,2022(04):643-657
A类：
Isentropic
B类：
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AB值：
0.554277
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