Long-term Change of Ground Temperature in the Shiyang River Basin
In this paper, the variation trend, abrupt change and anomalous years of annual and seasonal ground temperature in the Shiyang River Basin in 47 years are analyzed based on the monthly ground temperature data observed in the upper, middle and lower reaches of the drainage basin during the period of 1961 -2007. The results show that the ground temperature was holistically in an increase trend, and it was decreased during the period from the 1960s to the 1970s, increased in the mid-1980s, and increased obviously during the period from the 1990s to 21st century; the increase of ground temperature was the highest in the lower reaches, then in the middle reaches, and it was the lowest in the upper reaches. Ground temperature in the Shiyang River Basin in spring, summer and winter was in a decrease trend during the period from the 1960s to the 1980s but in an increase trend in autumn of the 1980s, and the seasonal ground temperature was increased during the period from the 1990s to 21st century. Ground temperature increase made a contribution to heat increase in spring and winter, and the maximum and minimum ground temperatures occurred in July and January respectively. Temporally, there were the ground temperature fluctuation periods of 6 -7 a and 9 - 10 a in the Shiyang River Basin, a sharp ground temperature increase has occurred since 1989, and the low ground temperature occurred mainly during the period from the late-1960s to the 1970s.
ground temperatureinterannual variationanomalous yearsharp climate changeShiyang River Basin
国家科技期刊平台
NSTL
万方数据
维普
