Jac Temperature In The Rainy Season In Extreme Events And Their Impact Factor Analysis

Based on the analysis of the climatic character of the extreme temperature event in Changjiang-huaihe Meiyu period from 1957 to 2001, the opposite relation between maximum temperature, minimum temperature, daily range of temperature and the rainfall anomalies of Jianghuai Meiyu period is emphasized in this paper, then, the circulation background of the daily range anomalies and the influence of SSTA on the daily range anomalies is analyzed. The main conclusions are as follows:(1) Extreme temperature of Changjiang-Huaihe area in Meiyu period is markedly influenced by landform, the extreme maximum temperature of middle part of Jianghuai area obviously warmer than other area, the extreme minimum temperature is warmer in southwest and cooler in northeast.(2) The maximum temperature, minimum temperature and daily range of temperature have obviously region difference, and all of them can be compartmentalized into south area, north area, west area. The secular trend , catastrophe and periodicity character are dissimilar in 3 area.(3) The opposite relation between the daily range of temperature in Changjiang-Huaihe area ,especially in south area of Changj iang-Huaihe area, and the precipitation is the best, so it is selected to analysis the circulation background and the influence of SSTA.(4) Monsoon circulation and South Asia high strengthen(weaken), subtropical high bate(reinforce), warm(cool) advection in low level intensify, air column thickness augment (reduce), the rainfall in south area of Changj iang-huaihe valley decrease(increase), the temperature daily range increase (decrease).(5) There is a apparent negative correlation between the temperature daily range in south area of Changjiang-huaihe valley over Meiyu period and SSTA in the Key region(143°E—160°E,27°N—39°N) from November to December in former year.