Analysis of the Trend of Extreme Climate and Dry and Rainy Seasons on Hainan Island in the Last 65 Years(1956-2020)
This study focuses on the daily rainfall data of five meteorological stations on Hainan Island from 1956 to 2020 provided by the National Meteorological Information Center.The climate element tendency rate,cumulative anomaly,and Mann Kendall non-parametric test are employed to analyze their change characteris-tics.The results showed that the extreme rainfall and the frequency of extreme rainfall on Hainan Island over the last 65 years had shown an increasing trend,with extreme rainfall events concentrated in the wet season and year-to-year continuity.It has the maximum number of days without effective rainfall in the dry season.The in-creasing trend of rainfall is insignificant,and the dry season drought is increasing year-to-year.Rainfall in April shows an increasing trend,and rainfall in November shows a decreasing trend.The dry and rainy seasons both show a trend towards a forward shift ahead of arrival and end.Comparing the April and November rainfall before and after the screening of extreme rainfall events,extreme rainfall has minor impact on the division of the dry and rainy seasons.In addition,the overall rainfall showed an upward trend and the increase was concentrat-ed in the rainy season.
Trend changeClimate extremesClimate changeHainan Island
NETL
NSTL
万方数据
