Cold wave(CW)events in East Asia have a significant impact on the social economy,ecosystems,and human health.Based on daily CW records from October to March during 1980-2019 and K-means clustering,this study identified two types of regional CW(T1 and T2)in China.T1 regional CWs mainly struck Northeast China,whereas T2 regional CWs primarily affected the northern and eastern regions of China.Compared to T1,T2 regional CWs were more intense,lasted longer,and had a broader region of influence.During 1980-2019,there was a significant increase in the frequency of T1 regional CWs,while the frequency of T2 regional CWs showed no trend.Although amplification of the Siberian high was observed in both T1 and T2 regional CW events,there were differences in the wave train patterns in the middle troposphere between the two regional CWs.During T1 regional CW events,a wave train with negative-positive 500-hPa geopotential height anomalies over Siberia-Mongolia weakened the East Asian trough,causing an eastward movement of cold air from Siberia.The increasing trend of T1 regional CW frequency may be attributable to the linear trends of 500-hPa geopotential height caused by global warming.The wave train associated with T2 regional CW events formed ridge-trough-ridge circulation anomalies over the Ural Mountains,Mongolia,and North China.This led to a southeastward intrusion of the cold air.The conclusions of this paper indicate that the Siberian high amplification and mid-tropospheric wave train pattern should be jointly considered in forecasting regional CW events in China.
Center for Climate System Prediction Research/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory of Meteorological Disaster,Ministry of Education,Nanjing University of Information Science & Technology,Nanjing,China
Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control,Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology,School of Environmental Science and Engineering,Nanjing University of Information Science & Technology,Nanjing,China
Nansen-Zhu International Research Centre,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing,China
寒潮 K-means聚类 西伯利亚高压 波列
Guangdong Major Project of Basic and Applied Basic Research
万方数据
维普
