青藏、伊朗高原地区300hPa温度场异常与我国降水的关系

青藏高原、伊朗高原地区下垫面的热力异常在300hPa温度场上有明显的特征,本文利用SVD诊断方法分析了300hPa温度场异常与我国区域降水的关系。分析表明：(1)伊朗高原南部和青藏高原中东部地区4月份300hPa温度与我国黄河上游以南地区5月份降水有显著的正相关关系;(2)高原大部特别是其南部地区4～6月300hPa温度与我国长江中下游以南部分地区7月份降水存在显著的反相关关系;(3)高原大部特别是其南部地区4～8月300hPa温度与我国黄河下游以南部分地区9月份降水有显著的正相关关系;(4)高原中部前一年6～10月300hPa温度与当年我国1月份长江中下游及以南大部分地区降水存在显著的反相关关系;(5)伊朗高原特别是伊朗高原中南部前一年6～10月300hPa温度与当年我国4～5月份长江中下游部分地区降水存在显著的反相关关系;(6)高原中南部9～10月300hPa温度与我国11月份长江中下游以南部部分地区降水存在显著的反相关关系。

Relation Between 300 hPa Temperature Anomalies over Iranian and Qinghai-Xizang Plateaus and Precipitation of China

Since 300 hPa temperature field can reflect the thermodynamic anomalies of Iranian and Qinghai-Xizang Plateaus(IQXP), the relation between 300 hPa temperature and precipitation of China is analyzed by using SVD expansion. The results include: (1) There exists the obvious positivie correlation between the 300 hPa temperature in April over the south of Iranian Plateau and the mid- and east- Qinghai-Xiang Plateau and the precipitation in May to the south of upper reach of Yellow River. (2) There are the clear negative correlation between the 300 hPa temperature from April to June over most of IQXP and the precipitation in July (especially their south part) and to the south of mid- and lower-reaches of the Changjiang River. (3) Between the 300 hPa temperature from April to August over most of IQXP(especially their south part) and the precipitation in September to the south of lower reach of Yellow River has positive correlation. (4) Negative correlation between 300 hPa temperature from June to Octomber of last year over the middle part of IQXP and precipitation in January of this year in mid- and lower-reaches of the Changjiang River and to the south of it is obtained. (5) Negative correlation between 300 hPa temperature from June to Octomber of last year over Iranian Plateau( in particular its mid- and south-parts) and precipitation from April to May of this year in mid- and lower reaches of the Changjiang River is obtained. (6) And also there are the negative correlation between 300 hPa temperature from September to Octomber over mid- and south-parts of IQXP and precipitation in November over the partial area to the south of mid- and lower|reaches of the Changjiang River.