Characteristics of Spatial and Temporal Change of Low Temperature and Rain in Guangdong in the Past 60 Years
Using the daily data of average temperature and sunshine duration for 74 national meteoro-logical observation stations in Guangdong from 1964 to 2023,the spatial and temporal variation characteris-tics of low temperature and rainy(to be referred to as"LT_R"hereafter)weather in the past 60 years were analyzed by the methods of linear tendency estimation,Mann-Kendall test and wavelet analysis.The results are shown as follows.In Guangdong,the average total number of LT_R days and the number of LT_R days of all grades are more in the northwest and less in the south;the ending date of LT_R weather in the north is late.The number of LT_R days in Guangdong is decreasing,with obvious interannual and interdecadal fluc-tuations;the total number of LT_R days and the number of severe LT_R days tend to decrease significantly,and while the ending date of LT_R days tends to advance significantly,the numbers of mild and moderate LT_R days show an insignificant falling trend.The total numbers of regional LT_R days and severe LT_R days show a decreasing trend;the ending date of LT_R days is advancing,and the changing trend of mild and moderate LT_R days is not significant.The total numbers of LT_R days and the numbers of mild and se-vere LT_R days have significant periodic oscillations of quasi-28 years;the number of moderate LT_R days has significant oscillations of quasi-14 years;the ending date of LT_R days has significant oscillations of quasi-24 years.In Guangdong,the total number of LT_R days and the number of mild LT_R days decreased abruptly around 2017,and the ending date of LT_R days advanced around that year;the number of LT_R days decreased abruptly in 2002;no abrupt change occurred in the number of moderate LT_R days.
climatologylow temperature and rainspatiotemporal distributionspringGuangdong
万方数据
维普
