徐士琦,刘刚. 2020. 近40年5-6月东北亚和北半球其他区域阻高活动特征及其联系[J]. 气象学报, (0):-, doi:10.11676/qxxb2020.020
近40年5-6月东北亚和北半球其他区域阻高活动特征及其联系
The characteristics of blocking high in Northeast Asia and other areas of the northern hemisphere as well as relationship between them during May to June in recent 40 years
投稿时间:2019-07-20  修订日期:2019-10-17
DOI:10.11676/qxxb2020.020
中文关键词:  5-6月,北半球阻高,东北亚阻高,青藏高原北阻高,特征,信息流
英文关键词:May to June,northern hemisphere blocking high,the Northeast Asia blocking high,the North Tibetan Plateau blocking high,characteristics,information flow
基金项目:国家自然科学基金(41530531, 41630424, 41875119)
作者单位E-mail
徐士琦 吉林省气候中心 xushiqi91@163.com 
刘刚 吉林省气象信息网络中心 loverdream1999lg@126.com 
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中文摘要:
      [资料和方法] 基于美国NCEP/NCAR-I 再分析资料,按照国际通行的阻塞高压(阻高)定义,采用计算机自动识别和天气图目视主客观相结合的检测方法,获得了1979—2018年5月和6月逐日北半球中高纬度阻高活动的无缝隙分布图;并利用线性相关和信息流因果关系等统计方法,[目的] 研究了东北亚(鄂霍次克海)阻高与北半球其它频繁活动区阻高活动特征及之间的联系。[结果、结论] 根据阻高活动集中程度与占北半球活动总天数的百分比,选定8个5月阻高主要频繁活动区和10个6月阻高主要频繁活动区。从统计结果来看,5月北太平洋、北美和乌拉尔山阻高活动占前三位,6月东北亚阻高活动天数跃升第一。值得注意的是,初夏在贝加尔湖以南、青藏高原以北地区出现了明显的阻高形势,称谓青藏高原北阻高。5月和6月北半球各频繁区阻高活动中心集中的纬度分布,自西向东具有“正弦波”特征,其主要活动频繁区虽引起同期北半球500hPa高度场的异常不尽相同,但均具有一定的遥相关特征;5月和6月东北亚阻高活动天数的年际变化分量具有明显的相对独立性。5月东北亚阻高是6月贝加尔湖阻高活动年际变化的稳定影响源,是6月青藏高原北阻高活动年际变化的不稳定影响源;唯有5月北太平洋阻高是6月东北亚阻高年际变化的稳定影响源。2019年6月北半球阻高活动最频繁和异常的区域位于欧洲地区达19d,为气候平均7d的2.6倍,也是导致欧洲大陆初夏高温的主要影响系统。
英文摘要:
      Based on NCEP/NCAR-I reanalysis, the internationally accepted definition of blocking high, using subjective and objective detection methods, we obtained the northern hemisphere blocking high distribution maps of 1979—2018 for 40 years from May to June. Linear correlation and information flow statistical methods were used to study the interannual and interdecadal relationship between the anomalous variation of the Northeast Asia blocking high and other blockings in northern hemisphere. According to the concentration of blocking high activities and the percentage of total days in northern hemisphere, 8 major areas in May and 10 major areas in June were selected. In May, the North Pacific blocking, the North America blocking, and the Ural blocking accounted for the top three. In June, the days of the Northeast Asia blocking jumped to the top. It is worth noting that in the early summer, there was a significant increase in the south of the Baikal Lake and north of the Tibetan Plateau, that is, the North Tibetan Plateau blocking high. The latitude distribution of the northern hemisphere blocking high activity center in May and June had a "sine wave" characteristic. Although the main active areas in the northern hemisphere caused 500hPa height field anomalies with different characteristics in May and June, they all had teleconnection characteristics. The interannual variation of the Northeast Asia blocking high in May and June had an obvious relative independence. The Northeast Asia blocking high in May was a source of the interannual variation of Lake Baikal blocking high in June, was an unstable source of the interannual variation of North Tibetan Plateau blocking high in June, and the North Pacific blocking in June was an only stable source of the interannual variation of the Northeast Asia blocking.In June 2019, the most frequent and abnormal area of the northern hemisphere''s blocking high activities was located in Europe for 19 days, 2.6 times the average climate of 7 days, and also the main influence system leading to the early summer high temperature in Europe.
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