摘要
利用东北地区99个测站近40年(1960～2000年)的春季3～5月气温资料与同期全球范围的温度场、高度场、风场资料,分析了东北地区春季冷、暖年的大气环流异常及要素场的空间分布特征。结果表明:冷春年,东北地区处于高度场的负距平中心,中层以上高纬地区有阻高或暖脊维持;东亚大槽指数的高值年对应东北高温,而低值年则对应东北低温;冷、暖春年的温度场的垂直分布十分深厚,冷春年东北地区主要受偏北气流影响,从地面到对流层顶均处于温度负距平中心内,纬向风在东北地区呈正距平分布,西风带势力较强,暖春年则相反。
By using the global temperature, height, and wind data of 40 years from 1960 to 2000, the anomalous features of global circulation in spring in cold/warm years in Northeast China were analyzed. It is concluded: in cold spring years, radial circulation prevailed in the troposphere; the Mongolia high and the Aleutian low strengthened at the lower-level, and cold air systems were more active; above the mid-level, there was a blocking high or warm ridge in the high-latitude region. The variation of the East-Asia Trough Index has a close relation with spring temperature. The variation of vertical temperature distribution extended up to the tropopause in cold/warm years. In cold spring year over Northeast China, north winds prevailed and the westerly was relatively strong; a negative temperature anomaly center extended from surface to tropopause, while a positive zonal wind area lay across Northeast China. In warm spring year, vice versa.
出处
《气象科技》
2005年第2期128-132,共5页
Meteorological Science and Technology
基金
国家自然科学基金项目40375032资助
