1951---2005年营口市气温变化特征分析

通过对1951--2005年营口市逐年和逐月气温变化特征分析，结果表明：近55a营口市年平均气温呈递增趋势，其中平均最低气温的增温趋势最强、平均气温次之、平均最高气温最弱。极端最高气温与年平均气温的变化趋势不同，呈现出前30a递减、近30a递增，近20a气候变暖更为突出；各月极端最高气温变率差异不明显。近55a营口市年极端最低气温呈递增趋势，最近30a较近55a显著递增，但近20a则稳定少动；各月极端最低气温均呈递增趋势，冬季递增趋势最强、夏季最弱。城市化发展及工业化引起的热岛效应是营口市显著增温的重要原因，而全球变暖的大背景则进一步加强了增温趋势。

Temperature variation from 1951 to 2005 in Yingkou,Liaoning province

Annual mean air temperature, monthly mean air temperature and the extreme air temperature in Yingkou from 1951 to 2005 were analyzed. The results show that annual mean air temperature has an increasing tendency during the recent 55 years. The minimum air temperature increases greatly, followed by mean air temperature and the maximum air temperature. The extreme maximum air temperature decreases from 1950s to 1980s and then in- creases from 1980s to 2000s, especially from 1980s to 2000s, which is different from the annual mean air temperature. The difference of the extreme maximum air temperature change rate among different months is not significant. The extreme minimum air temperature increases during recent 55 years, especially during recent 30 years, while it is stable during recent 20 years. The monthly extreme minimum air temperature is an increasing tendency, which is obvious in winter and becomes weak in summer. Heat island effect caused by urbanization and industrialization is the main reason for the temperature increasing, and the global warming makes it stronger.