The Evolutionary Patterns of Precipitation in Luzhou City Based on Meteorological Reanalysis Data
Based on the meteorological reanalysis of the daily precipitation data in China,the daily precipitation sequence of Luzhou City,Sichuan Province from 1961 to 2022 was calculated and analyzed by methods such as Mann-Kendall test,Sen′s slope estimation method,innovative trend analysis,the sliding T-test and Morlet wavelet analysis to explore the inter-annual variation and intra-annual distribution patterns of precipitation in Luzhou City.The results indicate that a significant jump change occurred in the annual precipitation series in 2011.Following the change,although there is a significant decreasing trend in the number of extreme precipitation days and extreme precipitation amount at the annual scale,the overall mean is significantly higher than before 2011.There is no obvious upward or downward trend in the annual precipitation days series.The annual precipitation series in Luzhou City from 1961 to 2022 shows an increasingly evident periodicity.The precipitation in Luzhou City exhibits significant seasonal variation,with the overall characteristics of the changes in the intra-annual distribution showing no trend or a non-significant decreasing trend.The non-significant decreasing trend in precipitation concentration degree(PCD)is concentrated in the low-value and high-value areas;the increase and decrease trends of precipitation unevenness(Cv)and complete regulation coefficient(Cr)in the low,medium,and high-value areas are fairly consistent,with the non-significant decreasing trend mainly located in the middle and low-value areas.
NETL
NSTL
万方数据
