干旱区研究2023，Vol.40Issue(11)：1718-1728,11.DOI:10.13866/j.azr.2023.11.02
宁夏近60a寒潮变化特征及其环流异常
Change characteristics and circulation anomaly analysis of cold wave in Ningxia over the past 60 years
摘要
Abstract
Based on daily temperature observation data and reanalysis data of the geopotential height,sea level pressure,and wind field from 1961 to 2020,the characteristics of spatial and temporal change of cold waves,strong cold waves,and exceptionally strong cold waves lasting 24 h,48 h,and 72 h were studied in Ningxia over the past 60 years.The causes of atmospheric circulation anomalies of cold waves were also revealed.The results show the following:(1)In the past 60 years,cold waves of different intensities and different durations in Ningxia consistently showed the distribution characteristics of"shifting eastwards and northwards."(2)The cumulative frequencies of cold waves,strong cold waves,and exceptionally strong cold waves in the region accounted for 71.7%,22.6%,and 5.7%of the total annual cold wave frequencies,respectively,among which cold waves dominated by process lasting 24 h and 48 h.The proportions of various durations for strong cold waves and exceptionally strong cold waves were equivalent.They mainly occured in October to April,during which the accumulated cold waves,strong cold waves,and exceptionally strong cold waves in the region accounted for 99%,98%,and 95%of those throughout the year,and there was a decreasing trend from January to April and increasing trend from October to December.(3)In the past 60 years,the cold waves,strong cold waves,and exceptionally strong cold waves have been decreasing at a rate of 4.5,2.8,and 0.18 per station every 10 years,respectively.Among them,the frequencies of waves of 24 h and 48 h as short durations were decreasing,but that of waves of 72 h as a long duration was decreasing.All types of cold waves decreased from the 1960s to the 1990s,reaching a minimum in the 1990s and increasing since the 2000s,with a sudden change around 1990.(4)Under the influence of global warming,the atmospheric circulation showed completely the opposite distribution characteristics between before and after the sudden change of cold waves in Ningxia.The key systems influencing cold waves in Ningxia are consistent.When the blocking high pressure in the Ural Mountains was stronger,the East Asian trough was deeper,the west Pacific subtropical high was weaker,the western side of Lake Baikal was dominated by cyclonic circulation,and cold high pressure at the ground was active,this was conducive to the southward movement of cold air in middle and high latitudes,and more cold waves in Ningxia.关键词
寒潮/时空演变/大气环流/异常分析/宁夏Key words
cold wave/evolutionary characteristics/atmospheric circulation/anomaly analysis/Ningxia引用本文复制引用
黄莹,王素艳,马阳,王岱,张雯,王璠..宁夏近60a寒潮变化特征及其环流异常[J].干旱区研究,2023,40(11):1718-1728,11.基金项目
宁夏自然科学基金项目(2022AAC03675) （2022AAC03675）
2018年宁夏青年拔尖人才培养工程 （）
