Abstract:

To analyze the variation characteristics of major meteorological factors in Horqin Sandy Land under the background of global climate change. Based on monthly meteorological data， the trend analysis， Mann-Kendall mutation point analysis and wavelet analysis were used to analyze the multi-scale temporal variation characteristics of main meteorological factors （temperature， precipitation and evaporation） in Naiman Banner from 1961 to 2021. The results showed that： under the global climate change， the major meteorological factors in the study area changed significantly， and the temperature increased significantly at a rate of 0.21 ℃/10a， the precipitation decreased significantly at a rate of -9.2 mm/10a， and the evaporation did not increase significantly at a rate of 32.50 mm/10a. From the seasonal variation， in spring and autumn， the temperature， precipitation and evaporation showed an increasing trend， while in summer and winter， temperature and evaporation increased and precipitation decreased. The time of mutation point of each meteorological factor was different， among which the temperature was about 1971， the precipitation was 1978 and 1987， and the evaporation were 2002， 2009 and 2013. All meteorological factors showed obvious periodic changes during the study period， including temperature of 3-7 a， 14-23 a and 34-43 a， precipitation of 3-6 a， 8-11 a， 13-23 a and 43 a， and evaporation of 5-7 a， 11-16 a， 27 a and 35 a.

Key words: temperature, precipitation, evaporation, mutation point, periodicity