Study on the Change Trend of Precipitation and Temperature in Kunming City Based on Mann-Kendall Analysis

Abstract

AbstractBased on the monthly meteorological data collected from Kunming weather stations in recent 26 years, the change characteristics of annual and inter-annual precipitation and temperature are analysized by linearity trend estimation; the change characteristics of precipitation and temperature are given a phased analysis by analyzing annual temperature anomaly.Mann-Kendall technique is applied to detect the change trend of precipitation and temperature. The result demonstrates that: the precipitation shows an increasing but not obvious trend; the mean temperature shows a clear increase trend. The inter-annual precipitation and mean temperature is high in the middle and low at the two ends, which shows an obvious seasonal distribution. The result of Mann-Kendall trend test shows: the change trends of precipitation of different seasons are not in accordance with the trend of the whole year, and there is a obvious increase in spring winter and the whole year and obvious decrease in fall; the change trends of mean temperature in different season are in accordance with that of the whole year, and all these periods have obvious increase trends.KeywordsPrecipitationmean temperatureclimatic change characteristicsMann-Kendall techniquetrend test