春季川渝地区气温与500 hPa高度场的奇异值分解

应用奇异值分解(SVD)技术研究了北半球500hPa高度场与春季川渝地区气温场的关系。结果表明前期10月和同期春季500hPa高度场与川渝地区气温场具有密切的同步及非同步时空相关,其第一模态代表了两场间的主要耦合特征;当前期10月(150°～180°E,60°～70°N)范围500hPa高度场降低(升高),同期春季青藏高原、川渝地区到我国东部500hPa高度场升高(降低),相应川渝地区春季气温升高(降低);大气环流的异常演变,通过影响区域天气气候,是造成川渝地区春季冷暖异常及气候变冷的重要原因之一;而前期10月500hPa高度场变化可作为川渝地区春季气温变化的一种预测信号。

Singular Value Decomposition Analysis of Air Temperature in Spring in Sichuan Province and Chongqing City and 500 hPa Geopotential Height

Using Singular Value Decomposition (SVD) technique, the relationship between 500 hPa heigt over the Northern Hemisphere and spring air temperature in Sichuan Province and Chongqing City(SPCC) is studied.The result shows that two fields have closely correlations in both synchror and asynchronous time-space. The first mods derived from SVD indicate the key coupled features of the height and temperature fields. When 500 hPa height is negative (positive) anomalies in the(150°～180°E, 60°～70°N) region in previous October and is positive (negative) from Qinghai-Xizang Plateau to East China in the same spring, the spring air temperature in SPCC will be positive (negative) anomalies. The change of general circulation, by influencing the regional weather and climate, is one of the important reasons for the anomalies and cooling of the air temperature in SPCC in spring. And the variations of 500 hPa height field in previous October is a forecast signal for the anomalies of spring air temperature in SPCC.