摘要
该文主要对1978—2019年铜仁市冬季凝冻特征进行分析,划分出铜仁市强弱凝冻年,并建立近40 a铜仁市冬季凝冻事件个例库,简要分析异常凝冻年的特征和成因。研究结果表明:①近40 a铜仁市雨凇日共出现1483 d,万山站出现1088 d(占铜仁市73.4%),除万山外雨凇均出现在12月、1月、2月;②近40 a铜仁市冬季共出现164次凝冻天气过程,冬季多出现4~5 d的中级凝冻过程(占凝冻过程总数的47%);③近40 a铜仁市共有7 a为异常凝冻年,异常凝冻年出现凝冻天气过程是凝冻过程总数的1/4,2008年是持续时间最长影响范围最大的特重级异常凝冻年;④铜仁市冬季凝冻在空间上由西北向东南方向逐渐增加,时间上有不明显的递减趋势;⑤赤道太平洋Nino3.4区海温异常偏低,欧亚大陆500 hPa高度场中高纬出现北高南低的异常环流,是铜仁市发生异常凝冻年的主要成因。
This paper mainly analyzes the characteristics of winter freezing in Tongren from 1978 to 2019,divides the strong and weak freezing years in Tongren,establishes the case database of winter freezing events in Tongren in recent 40 years,and briefly analyzes the characteristics and causes of abnormal freezing years.The results show that:①In recent 40 years,there are 1483 glazed days in Tongren,1088 days in Wanshan(73.4%of Tongren),and glazed days appear in December、January and February,except Wanshan.②In recent 40 years,there are 164 freezing weather processes in winter,and the intermediate freezing process of 4~5 days occurred in winter(accounting for 47%of the total freezing process).③In recent 40 years in Tongren,there are 7 years of abnormal freezing year,the freezing weather process of abnormal freezing year is 1/4 of the total freezing process,and 2008 is the most severe abnormal freezing year with the longest duration and the largest influence range.④The winter freezing in Tongren gradually increases from northwest to southeast in space,but has an insignificant decreasing trend in time.⑤The abnormal low SST in Nino3.4 region of the equatorial Pacific and the abnormal circulation of north high and south low in the high latitude of Eurasia 500 hPa height field are the main causes of the abnormal freezing year in Tongren.
作者
张丹丹
严小冬
张李娟
黎荣
许文亚
ZHANG Dandan;YAN Xiaodong;ZHANG Lijuan;LI Rong;XU Wenya(Bijiang Meteorological Bureau of Tongren,Tongren 554300,China;Climate Center of Guizhou,Guiyang 550002,China;Meteorological Bureau of Tongren,Tongren 554300,China;Meteorological Bureau of Dejiang,Dejiang 565200,China)
出处
《中低纬山地气象》
2021年第6期38-43,共6页
Mid-low Latitude Mountain Meteorology
基金
国家自然科学基金地区项目(41865005):贵州凝冻灾害事件特征和成因及其预报预测研究
贵州省气象局科研业务登记项目(黔气科登[2020]03-20号):铜仁市凝冻灾害事件气候特征研究。
关键词
凝冻
时空特征
海温
500
hPa高度场
freezing
spatial-temporal features
sea surface temperature
500 hPa height field
作者简介
第一作者:张丹丹(1992—),女,工程师,主要从事综合气象业务工作,E-mail:3296291841@qq.com。
