Climate Change of Weihe River Basin and Its Regional Differences

Based on the meteorological data from China meteorological data sharing service system,climate change of Weihe River basin and its regional difference from 1951 to 2007 were analyzed.Results showed that the annual maximum wind speed and the average wind speed presented a decreasing trend,but they have no significant change in recent years and were less than the average.The annual precipitation of Weihe River basin had no abrupt change,but on the whole,the average annual precipitation after 1987 was significantly less than that before 1987.The days for ≥ 0.1 mm daily precipitation after 1993 were less than average,but had no significant change from 1993 to 2007.The annual mean temperature and the minimum temperature of the basin showed a increasing trend,rising at the rates of 0.544,0.509,0.386,and 0.667 ℃/10 a,respectively.The rates were all far greater than the average global warming rate of 0.13 ℃/10 a in nearly 50 years,which indicates a great increase in the annual temperature.Number of sunshine hours in Weihe River basin showed different characteristics.The change of sunshine hours was also different in different regions.In the northeast,sunshine hours showed an increasing trend,but in other regions,showed a decreasing trend.Relative humidity of Weihe River basin showed an obvious decreasing trend.The climate change of Weihe River basin showed a warming and drying trend.