Abstract:

Desert lakes are more sensitive to climate change than other lakes， and the lakes also have some feedback to local climate. At present， the research on desert lakes in China is mainly concentrated in the Badain Jaran Desert， and there are many desert lakes in the Tengger Desert， but there are relatively few related studies. Based on the global surface water dataset， this paper analyzes the changes of water area in the Tengger Desert lakes from 2001 to 2020， combined with the data of temperature， wind speed， precipitation and evaporation in the region， and uses trend analysis， grey correlation analysis and Pearson correlation analysis to explore the response mechanism of the Tengger Desert lakes to climate change and the feedback effect of the lakes on the local climate. The results showed that： （1） During the period from 2001 to 2020， the area of lakes in the Tengger Deser fluctuated， and the relative variability rate was 10.05%-13.66%. （2） The annual average temperature and wind speed in the Tengger Deser lake area fluctuated little， and the annual precipitation and annual evaporation showed a fluctuating upward trend. （3） The response of the Tengger Deser lakes to climate change showed that the area of lakes was negatively correlated with temperature and positively correlated with precipitation. The feedback of lakes to the local climate was that the temperature and precipitation in the desert lake area were higher than those in the non-lake area.

Key words: desert lakes, Google Earth Engine, response and feedback, Tengger Desert, climate change