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.
关键词
气候学/低温阴雨/时空分布/春季/广东
Key words
climatology/low temperature and rain/spatiotemporal distribution/spring/Guangdong
维普
万方数据