Variation Features and Impact of High Temperature in Sichuan during Last 50 Years
Based on the daily temperature data of 141 stations in Sichuan from 1961 to 2010,variation features of the high temperature and the impact were analyzed.The results show that,from 1961 to 2010,the occurrence time of the first high temperature day in Sichuan had shifted to an earlier date with a speed of every 10 years ahead of 1.2 d,and the occurrence time of the last high temperature day had shown a postponed trend of every 10 years to defer 1.8 d.The high temperature days showed a significant increasing trend of every 10 years to increase 0.7 d,and the longest continuous days of the high temperature also showed a significant increasing trend,with an increase of 0.3 d every 10 years.For the whole Sichuan Province,during the past 50 years,the southern part of Sichuan Basin is the region where the high temperature days and the intensity showing the most significant increase trend,and the area of the western and central part of the Basin is the second obvious region.Since the 1990s,to the southern region of the Basin,the significantly increased and enhanced high temperature weather and obvious reduced precipitation had led to more frequent high temperature and drought disaster with more seriously affect; To the western and central region of the Basin,the obvious increased and enhanced high temperature weather and signicantly reduced precipitation had led to a grim regional water resources situation.
The first high temperature dayThe last high temperature dayHigh temperature daysSichuan