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Reversal of monthly East Asian winter air temperature in 2020/21 and its predictability

Atmospheric and Oceanic Science Letters 2022年第1期15卷 42-48页

作者： Hongqing Yang Ke Fan School of Atmospheric Sciences Sun Yat-sen Universityand Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)ZhuhaiChina

In this study,the reversal of monthly East Asian winter air temperature(EAWT) in 2020/21 and its predictability were *** reversal of monthly EAWT in 2020/21 was characterized by colder temperatures in early winter(December 2020 to mid-January 2021) and warmer temperatures in late winter(mid-January to February 2021).Results show that the reversal in the intensity of the Siberian high(SH) also occurred between early and late winter in 2020/*** early winter,as the Barents-Laptev sea ice in the previous September(i.e., in2020) reached a minimum for the period 1981-2020,the SH was strengthaned via a reduction of the meridional gradient between the Arctic and East *** late winter,as a sudden stratospheric warming occurred on 5 January 2021,the stratospheric polar vortex weakened,with the weakest center shifting to North America in ***,the negative Arctic Oscillation-like structure shifted towards North America in the middle and lower troposphere,which weakened the SH in late ***,the predictability of the reversal in EAWT in 2020/21 was validated based on monthly and daily predictions from NCEP-CFSv2(National Centers for Environment Prediction-Climate Forecast System,version 2).The results showed that the model was unable to reproduce the monthly reversal of ***,it was able to forecast the reversal date(18 January 2021)of EAWT at lead times of 1-20 days on the daily scale.

关键词： Monthly reversal East Asia winter air temperature Barents-Laptev sea ice Stratospheric polar vortex Siberian high Predictability

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Influence of October Eurasian Snow on winter temperature over Northeast China

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Advances in Atmospheric Sciences 2017年第1期34卷 116-126页

作者： Huanlian LI Huijun WANG Dabang JIANG China Meteorological Administration Training Centre Beijing 100081China Nansen-Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Climate Change Research Center Chinese Academy of SciencesBeijing 100029China

This paper addresses the interannual variation of winter air temperature over Northeast China and its connection to preceding Eurasian snow cover. The results show that there is a significant negative correlation between October Eurasian snow cover and following-winter air temperature over Northeast China. The snow cover located in eastern Siberia and to the northeast of Lake Baikal plays an important role in the winter air temperature anomaly. More （less） eastern Siberia snow in October can cause an atmospheric circulation anomaly pattern in which the atmospheric pressure is higher （lower） than normal in the polar region and lower （higher） in the northern mid-high latitudes. Due to the persistence of the eastern Siberia snow from October to the following winter, the winter atmospheric anomaly is favorable （unfavorable） to the widespread movement of cold air masses from the polar region toward the northern mid-high latitudes and, hence, lower （higher） temperature over Northeast China. Simultaneously, when the October snow cover is more （less）, the SST in the northwestern Pacific is continuously lower （higher） as a whole; then, the Aleutian low and the East Asia trough are reinforced （weakened）, favoring the lower （higher） temperature over Northeast China.

关键词： winter air temperature Northeast China Eurasian snow cover physical mechanism atmospheric circulationanomaly

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Influence of October Eurasian Snow on winter temperature over Northeast China

Influence of October Eurasian Snow on Winter Temperature ove...

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第34届中国气象学会年会

作者： Huanlian LI Huijun WANG Dabang JIANG China Meteorological Administration Training Centre Nansen-Zhu International Research Centre Institute of Atmospheric Physics Chinese Academy of Sciences Climate Change Research Center Chinese Academy of Sciences

This paper addresses the interannual variation of winter air temperature over Northeast China and its connection to preceding Eurasian snow *** results show that there is a significant negative correlation between October Eurasian snow cover and following-winter air temperature over Northeast *** snow cover located in eastern Siberia and to the northeast of Lake Baikal plays an important role in the winter air temperature ***（less）eastern Siberia snow in October can cause an atmospheric circulation anomaly pattern in which the atmospheric pressure is higher（lower）than normal in the polar region and lower（higher）in the northern mid-high *** to the persistence of the eastern Siberia snow from October to the following winter,the winter atmospheric anomaly is favorable（unfavorable）to the widespread movement of cold air masses from the polar region toward the northern mid-high latitudes and,hence,lower（higher）temperature over Northeast ***,when the October snow cover is more（less）,the SST in the northwestern Pacific is continuously lower（higher）as a whole;then,the Aleutian low and the East Asia trough are reinforced（weakened）,favoring the lower（higher）temperature over Northeast China.

关键词： winter air temperature Northeast China Eurasian snow cover physical mechanism atmospheric circulation anomaly

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