秦育婧,冯梦茹,卢楚翰,何书雅,李丽平,胡春丽. 2022. 基于自动识别的近三十年华北地区冬季冷锋活动异常及其可能成因[J]. 气象学报, (0):-, doi:[doi]
基于自动识别的近三十年华北地区冬季冷锋活动异常及其可能成因
Winter cold front activities and the associated circulation characteristics in North China in recent 30 years based on an automatic identification method
投稿时间:2021-12-10  修订日期:2022-06-01
DOI:
中文关键词:  冷锋,西伯利亚高压,EU波列,冷空气活动,自动识别
英文关键词:Cold front, Siberian High, EU teleconnection wave, Cold air activity, Automatic identification method
基金项目:江苏省科技计划专项资金(BE2022161)
作者单位邮编
秦育婧 南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心 210044
冯梦茹 南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心江苏省常州市金坛区气象局 210044;213200
卢楚翰 南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心 210044
何书雅 南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心 210044
李丽平 南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心 210044
胡春丽 辽宁省生态气象和卫星遥感中心 110166
摘要点击次数: 12
全文下载次数: 9
中文摘要:
      利用1989-2018年ERA5再分析资料,使用适用于欧亚大陆的冷锋两步客观识别算法,得到冬季冷锋活动数据集。在此基础上,分析了近三十年来华北地区冬季冷锋活动特征,并讨论了冷锋活动异常的可能成因。结果表明:1)华北地区是东亚大陆上冬季冷锋频数最多,冷锋活动最强的关键区域,且华北地区冷锋活动强度有明显的年际变化;2)在华北地区冷锋活动强年,从北大西洋到欧亚大陆上空,存在一个明显的EU遥相关波列正位相,华北地区上空500hPa为负位势高度异常,表明东亚大槽增强,相应的地面西伯利亚高压偏强;3)欧亚大陆北部边缘海区域为异常暖平流时,华北地区冷空气活动增强,冷锋活动也增强;4)大西洋北部的SST异常,可能通过激发对流层中、上层的Rossby波,然后向东传播,经过欧洲-西西伯利亚传至我国华北地区,从而影响我国华北地区的冷锋活动强度。
英文摘要:
      In this study, the dataset of winter cold front activities is obtained by using the two-step cold front identification method in Eurasia based on the ERA5 reanalysis data from 1989 to 2018. Moreover, the characteristics of winter cold front activities in North China in recent 30 years are analyzed, and the possible causes of cold front activity anomaly are discussed. The results show that North China is the key area with the highest frequency of cold front on the East Asian continent. The frequency index of cold front activities in North China has an obvious interannual variation. In the strong years of cold front activities in North China, there is an obvious positive phase of Eurasia teleconnection pattern from North Atlantic to Eurasia, and a negative anomaly of geopotential height at 500hPa over North China. It indicates the enhancement of East Asia trough and a corresponding stronger surface Siberian high. When the sea area on the northern margin of Eurasia is predominated by an anomalously warm advection, the cold air activity and the frequency of cold front in North China is increased. The SST anomaly in the northern Atlantic Ocean may stimulate the Rossby waves in the middle and upper troposphere and spread eastward to North China through Europe and Western Siberia, thus affecting the frequency of cold front in North China.
查看全文   查看/发表评论  下载PDF阅读器
分享按钮