青藏、伊朗高原春夏季高层热力异常与我国夏季气温的关系

Relation between Upper-Level Thermodynamic Anomaly over Qinghai-Xizang and Iranian Plateaus in Spring and Summer and China Air Temperature in Summer

首先利用EOF方法,分析了0°～180°E,0°～60°N范围内100,150,200,250,300,400,500hPa等层次上温度场的时空变化特征,结果表明,青藏、伊朗高原的热力异常在300hPa温度场上有明显的体现。然后利用SVD方法,分析了青藏、伊朗高原地区300hPa温度场异常与我国区域气温的关系,分析表明:(1)伊朗高原大部和青藏高原中部、西北部6～8月300hPa温度与我国长江流域和江淮之间同期的气温有显著的正相关关系;(2)青藏高原东部、西北部4～5月300hPa温度与我国长江流域偏南地区6～8月的气温有显著的正相关关系。

Firstly, thetemporal and spatial variations of temperature fields of 100, 150, 200, 250, 300, 400 and 500 hPain 0°～180°E, 0°～60°N were analyzed by using EOF method. Resultsshow that 300 hPa temperature field can reflect the thermodynamic anomaly of Iranian and Qinghai-Xizang Plateaus. Secondly, the relationbetween 300 hPa temperature and regional air temperature of China is analyzed by using SVD expansion. Results show:(1) There is a positive correlation between 300 hPatemperature in the most of Iranian Plateau, thecenter and north-west of Qinghai-Xizang Plateau and air temperature in Changjiang River and Huaihe valley in June～August. (2) 300 hPa temperature in the east, northwestof Qinghai-Xizang Plateau in April～May positively correlates to air temperature in the southern-toward area in Changjiang River valley in June～August.