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Extreme cold wave in early November 2021 in China and the influences from the meridional pressure gradient over East Asia

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Advances in Climate Change Research 2022年第6期13卷 797-802页

作者： Xiang LI Ying-Juan ZHANG Hui GAO Ting DING National Climate Center China Meteorological AdministrationBeijing 100081China Beijing Meteorological Service Beijing 100089China

In early November 2021,China experienced its second strongest cold wave event during *** the Siberian high is considered the main factor influencing cold wave events in East Asia,it was not extremely strong from 4 to November 9,*** spatial distribution of the correlation coefficients between the sea level pressure and the daily temperature anomalies shows a monopole pattern,with a notable negative centre in the southern part of the Siberian high monitoring ***,the correlation between the sea level pressure and temperature drop presents a typical dipole pattern,with a distinct negative centre in the northern monitoring domain and a positive centre in southern East *** the November 2021 super cold wave process,the sea level pressure anomalies display a dipole pattern with a higher centre in the north and a lower centre in the south owing to the northward shift of the Intertropical Convergence *** meridional pressure gradient index clearly reveals the non-negligible effect of subtropical low-pressure on this super cold wave process,indicating its possibly essential supplementary role in enhancing this *** above findings provide a new understanding of its mechanism and long-range forecasts.

关键词： Cold wave Siberian high Meridional pressure gradient dipole pattern

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Impacts of Polar Vortex,NPO,and SST Configurations on Unusually Cool Summers in Northeast *** I:Analysis and Diagnosis

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Advances in Atmospheric Sciences 2013年第1期30卷 193-209页

作者：廉毅沈柏竹李尚锋赵滨高枞亭刘刚刘平曹玲 Laboratory of Research for Middle-High Latitude Circulation Systems and East Asian Monsoon Institute of Meteorological Sciences of Jilin Province National Meteorological Center Jilin Meteorological Science and Technology Service Center Center of Weather Film in Jilin Province

This study unveils the evolution of two major early signals in the North Pacific atmosphere-ocean system that heralded abnormal high-pressure blockings and cold-vortex activities across Northeast China, based on an analysis of the configurations of major modes including the polar vortex, the North Pacific Oscillation （NPO）, and SST in the preceding winter and spring and atmospheric low-frequency disturbances in Northeast China. We analyzed these aspects to understand the atmosphere ocean physical coupling processes characterized by the two early signals, and here we explain the possible mechanisms through which dipole circulation anomalies affect the summer low-temperature processes in Northeast China. We further analyzed the interdecadal variation background and associated physical processes of the two early signals.

关键词： polar vortex NPO North Pacific SST atmosphere-ocean coupling summer low temperatures in Northeast China dipole pattern

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The dipole Mode of the Summer Rainfall over East China during 1958–2001

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Advances in Atmospheric Sciences 2009年第4期26卷 727-735页

作者：韩晋平张人禾 State Key Laboratory of Severe Weather(LaSW) Chinese Academy of Meteorological Sciences Nansen-Zhu International Research Centre Institute of Atmospheric Physics Chinese Academy of Sciences

By examining the second leading mode （EOF2） of the summer rainfall in China during 1958 2001 and associated circulations, the authors found that this prominent mode was a dipole pattern with rainfall decreasing to the north of the Yangtze River and increasing to the south. This reverse relationship of the rainfalls to the north and to the south of the Yangtze River was related with the meridional circulations within East Asia and the neighboring region, excited by SST in the South China Sea-northwestern Pacific. When the SST was warmer, the geopotential heights at 500 hPa were positive in the low and high latitudes and negative in the middle latitudes. The anticyclone in the low latitudes favored the subtropical high over the northwestern Pacific （SHNP） shifting southwestward, leading to additional moisture transport over southern China. The anomalous atmospheric circulations along the East Asian coast tends to enhance upward movement over the region. Subsequently, rainfall in southern China is enhanced.

关键词： second leading mode rainfall dipole pattern sea surface temperature

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