大气科学学报2023，Vol.46Issue(6)：864-875,12.DOI:10.13878/j.cnki.dqkxxb.20230509001
近11年中国寒潮频发的机理分析
Causes of China's frequent cold waves over the past 11 years
摘要
Abstract
In this study,using data from 840 observed stations and ERA5 reanalysis,the decadal variation charac-teristics of the nationwide cold wave frequency in the cold season over the past 63 years(1960-2022)were ana-lyzed.The statistical results show the following:against the background of global warming,the decreasing trend of cold wave frequency reversed in 2012,then showed a significant increasing trend from 2012 to 2022.During the latter period,the Ural Mountain blocking frequency was significantly negatively correlated with the occurrence frequency of nationwide cold waves.The Ural Mountain blocking high inhibits the occurrence and development of high-altitude jet streams,weakens the zonal circulation of the atmosphere,and blocks the southward movement of cold air masses in the Arctic,in turn reducing the frequency of cold waves.At the same time,the Ural Mountain blocking high favors weakening the surface 2 m temperature gradient over mid-to-high-latitude Eurasia.The fre-quent occurrence of Ural Mountain blocking often leads to more weather-scale phenomena of Arctic warming and mid-latitude cooling.In addition,Arctic warming effect itself also has a significant negative correlation with Chi-na's cold wave frequency.Arctic warming reduces the temperature difference between mid-to-high latitudes,and weakens the westerly belt,thus also weakening the transport of cold air.Over the past 11 years,the Ural Mountain blocking frequency has shown a significant decreasing trend.Correspondingly,the zonal gradient of potential vor-ticity on isentropic surfaces has a linear increasing trend,which is unfavorable for the maintenance of blocking highs.Along with this,the Arctic warming effect also shows a weakening trend.This atmospheric circulation con-figuration is conducive to China's increase of cold wave frequency in recent years.关键词
年代际变化/寒潮/阻塞高压/高空急流/北极增暖Key words
interdecadal changes/cold wave/blocking high/upper-level jet stream/Arctic warming引用本文复制引用
胡宏博,黄艳艳,戴金,赵钱飞..近11年中国寒潮频发的机理分析[J].大气科学学报,2023,46(6):864-875,12.基金项目
国家电网有限公司科技项目(5180-20221280A-2-68-XG) （5180-20221280A-2-68-XG）
国家自然科学基金资助项目(42305022) （42305022）
