Abstract:

Based on the daily maximum and minimum temperature,monthly precipitation from 11 meteorological stations in Shanghai and the West Pacific subtropical high area and intensity index,the climatic characteristics and its effecting factors of high and low temperature in Shanghai were analyzed.From 1873 to 2007,the high temperature days showed lessmorelessmore interdecadal variability,and the low temperature days showed moreless interdecadal variability.In the period from 2001 to 2007,Shanghai had the most high temperature days and the least low temperature days,the most numbers and days of high temperature process and the least numbers and days of low temperature process in the past 135 years.In the period from 1960 to 2007,annual high temperature days were positively correlated with the summer area and intensity index of West Pacific subtropical high significantly.Annual low temperature days were negatively correlated with the winter area and intensity index of West Pacific subtropical high significantly.Precipitation has some alleviation for the extreme temperature.Annual high temperature days were negatively correlated with the summer precipitation in Shanghai,and annual low temperature days were also negatively correlated with the winter precipitation from 1960 to 2007.Urbanization has more influence on the high temperature process than it on the low temperature process.The difference of high temperature process between urban and suburb area was obvious,but the difference of low temperature process was less.
 

Key words: high temperature/low temperature/effecting factors/interdecadal variability/correlation/Shanghai