Analysis on Climatic Change of Laiwu City in Recent 52 Years
According to the data of monthly average temperature, precipitation, first and latest frost date, frostless period, sunshine hours and so on in Laiwu city during 1957 ～2009, the author analyzed the climatic changeable feature of Laiwu in the recent 52 years by using linear equation, 5 -year moving-average and climatic tendency methods. The results showed that the temperature of Laiwu gradually increased in the recent 52 years and mainly increased after 1990s. The increasing rate of temperature in different seasous was different, there was the following order: winter ＞ spring ＞ autumn ＞ summer. In the recent 20 years, the temperature of Laiwu increased rapidly in spring, autumn and especially in winter. Moreover, the extreme maximum temperature decreased, the number of high temperature days reduced, the intensity of extreme minimum temperature became weaker and its duration days decreased,annual temperature range decreased, winter became wanner and summer became colder. The precipitation decreased gradually but increased in the late 1990s especially in summer. The days and intensity of rainstorm increased sharply and extreme precipitation events increased. The annual sunshine hours decreased with large fluctuation and decreased sharply in the early 21 century especially in autumn.
国家科技期刊平台
NSTL
万方数据
维普
