Abstract: Using the temperature data from radiosonde station in Changchun, Yanji and Linjiang of Jilin province during 1960 to 2009, the variations of the standard isobaric surface temperature (8 levels) from ground to 100 hPa were analyzed by a linear trend analysis method. The results show that under the global change background, annual tropospheric temperature below 700 hPa is in an increasing trend in Jilin province, while it is in a decreasing trend above 400 hPa. The seasonal change of tropospheric temperature is different. It ascends below 400 hPa in autumn and winter and below 700 hPa in spring and summer. The ascending amplitude of tropospheric temperature is greater in autumn and winter than in spring and summer. The ascending trend of tropospheric temperature differs for different size cities. The ascending amplitude is greater in the large city (Changchun) than in the middle and small cities. The height that warming could reach in the different standard layers is higher in Changchun than in the middle and small cities.

Key words: font-family: "Times New Roman", mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, Urbanization')">mso-fareast-font-family: 宋体">Urbanization, Upper level, Temperature