渤海冰情异常年的典型大气环流概念模型

选取1960—2013年渤海冰情等级和北半球1959—2014年NCEP/NCAR再分析500 h Pa和1000 h Pa高度场逐日资料,采用滑动平均、相关分析和聚类分析等方法,研究了渤海冰情异常年的大气环流概念模型。结果表明:重冰年有3类典型环流型(偏北气流型、西北气流型、东北气流型),每个环流型代表了一条影响渤海的冷空气路径;其共同特点是欧亚高纬地区为正距平,贝加尔湖到我国东北地区为负距平,亚洲中高纬度为经向环流。轻冰年也分为3类典型环流型(新地岛极涡型、欧洲大槽型、欧亚环流平直型),它们的共同特点是亚洲区域南高北低,极区为负距平,中高纬区域为正距平,亚洲中高纬度环流平直。

Conceptual Model of Typical Atmospheric Circulation in Bohai Ice Anomaly Year

Based on the Bohai ice grade from 1960 to 2013 and the 500 hPa and 1000 hPa daily data of NCEP/NCAR reanalysis from 1959 to 2014, using the method of moving average, correlation analysis and cluster analysis, the conceptual model of atmospheric circulation in Bohai ice anomaly year are studied. The results show that in severe ice year there are 3 kinds of typical circulation models (northerly airflow type, northwest airflow type, northeast airflow type), each model represents one path of cold air, which influence the Bohai. The common characteristics are positive anomaly in Eurasia high latitude areas, negative anomaly from Lake Baikal region to the northeast China, and meridional circulation in Asia middle high latitude. In light ice year there are 3 kinds of typical circulation models (polar vortex type, European trough type, straight circulation in Eurasia type), their common features are south high and north low in Asia region, negative anomaly in polar, positive anomaly in middle high latitude area, straight circulation in Asia middle high latitude.