近50年鉴江流域日照时数的气候特征  

Climatological Characteristics of Sunshine Duration for the Basin of Jianjiang River over the Past 50 Years

作　　者：古明媚 张涛 范伶俐[2] 罗健 陈桂荣 杨肖 GU Ming-mei;ZHANG Tao;FAN Ling-li;LUO Jian;CHEN Gui-rong;YANG Xiao(Maoming Dianbai District Meteorological Service,Maoming 525400;Guangdong Ocean University,Zhanjiang 524088)

机构地区：[1]茂名市电白区气象局,广东茂名525400 [2]广东海洋大学,广东湛江524088

出　　处：《广东气象》2024年第3期32-36,共5页Guangdong Meteorology

基　　金：茂名市气象局科研项目(202203)。

摘　　要：利用线性趋势、M-K突变分析等方法详细分析了1973—2022年鉴江流域年、季日照时数气候特征,结果表明:近50年来,鉴江流域春季日照时数呈不显著的上升趋势,年及其他3季则呈不显著下降趋势。从9年滑动平均日照时数看,夏、秋季主要集中在550~640 h之间,春、冬季主要集中在300~400 h之间。春季日照时数在2007年前后发生突变,秋季在1995年前后发生突变。年日照时数主要存在2~6年显著周期。空间分布上,年日照时数呈现由南向中北部递减分布。相对湿度、降水量、降水日数、总云量以及低云量与日照时数显著负相关,夏季平均气温和平均最高气温与日照时数呈显著正相关。Using the methods of linear tendency and Mann⁃Kendall abruptness test,this paper analyzed the climatological characteristics of yearly and seasonal sunshine duration for the basin of Jianjiang River for 1973 to 2022.The results are shown as follows.Over the 50 years studied,the sunshine duration tended to increase insignificantly for the spring but decrease insignificantly for the remaining three seasons and on the yearly scale.It is known from a nine⁃year running mean that the sunshine duration was between 550 and 640 h for summer and autumn and between 300 and 400 h for spring and winter.The spring sunshine duration had an abrupt change around 2007 and the autumn one experienced it around 1995.The yearly sunshine du⁃ration oscillated significantly at the periods of two to six years.On the spatial distribution,the yearly sun⁃shine duration decreased progressively from south to the middle and north.It was much negatively correlated with relative humidity,rainfall,rain days,total cloudage and low cloud amount but much positively correla⁃ted with average temperature and average maximum temperature in summer.

关 键 词：气候学 日照时数 9年滑动平均 气候趋势 鉴江流域 

分 类 号：P467[天文地球—大气科学及气象学]