Hydrological Response To Atmospheric Temperature Changes In The Qaidam Basin And Its Surroundings Over Past 60 Years

Influenced by the global warming,Hydrogeological conditions have also changed.However,the impact of atmospheric atmospheric temperature changes in the Qaidam Basin on hydrology is still unclear.Based on the atmospheric temperature and hydrological data from 1956 to 2016 in the Qaidam Basin and surrounding areas,this paper analyzes the change characteristic of atmospheric temperature,precipitation,runoff and baseflow,and analyzes the relationship between atmospheric temperature and precipitation,river runoff and the paper achieved the following results:(1)Atmospheric temperature in most areas of the study area have shown a significant increase.The rate of warming is inside the Qaidam Basin > the southern part of the Qaidam Basin > the southeastern part of the Qaidam Basin > the eastern part of the Qaidam Basin.The change is divided into three stages: the atmospheric temperature was mainly reduced before 1967;the atmospheric temperature was mainly fluctuating from 1968 to 1997;after 1998,the atmospheric temperature showed a significant increase.The annual average atmospheric temperature saltation in most areas occurred around 1998.(2)In most areas of the study area,precipitation has shown an insignificant growth trend in the past 60 years.The rate of increase is expressed in the southern part of the basin > in the basin > southeast of the basin > east of the basin.The mutations in the area mainly occurred in about 2002.The areas where the mutations occurred were mainly in the southern and eastern parts of the Qaidam Basin.The precipitation before the mutation showed fluctuation characteristics.After the mutation occurred,the increase trend was obvious in most areas.On the seasonal scale,precipitation in spring and winter showed an increasing trend in most areas,and the increase trend in summer and autumn was not obvious.The rate of increase in precipitation was spring>summer>winter>autumn.(3)River runoff and baseflow have shown an increasing trend in the past 60 years,and the growth trend is obvious in most areas.The abrupt time of river runoff and baseflow is roughly the same,and mainly distributed in 1967,1991-1997 and 2002.The runoff and baseflow of most rivers decreased before 1967,and increased in 1968-1990.The decline was significant in 1990-2001 and began to increase around 2002.(4)Atmospheric temperature has little effect on precipitation,but atmospheric temperature has a large impact on river runoff and baseflow.Precipitation also has an impact on river runoff and baseflow,but not as significant as temperature.Therefore,the atmospheric temperature mainly affects river runoff and baseflow by affecting the amount of snowmelt,and has little to do with precipitation.