摘要
利用2005—2021年广西91个国家气象观测站的逐时降水观测资料,对广西汛期降水的小时平均降水量、降水频率、降水强度进行分析。结果表明:(1)在空间分布上,小时平均降水量和降水频率日峰值从南向北呈“高-低-高”形态,降水强度日峰值则呈南高北低,高值区出现沿海和桂东南。(2)桂东北、桂西北和沿海地区的小时平均降水量峰值出现在04—09时,桂东南出现在15—17时,桂西南出现在05—07时和16—18时,桂东南多昼雨,其它地区多夜雨。(3)沿海地区的降水强度日变化最明显,桂东南、桂西南次之,桂东北和桂西北不显著。(4)各区域的降水变化特征和该地区的地理位置和影响天气系统有很大关系,桂东北、桂西北小时平均降水量和降水强度峰值的出现在5—6月,以锋面降水和夏季风降水为主,桂东南、桂西南和沿海地区的小时平均降水量和降水强度峰值出现在6—8月,以夏季风降水和热带系统降水为主。
Based on the hourly data of the 91 national weather stations in Guangxi during 2005-2021,the diurnal characteristics of the hourly average precipitation,precipitation frequency,and precipitation intensity in Guangxi during the flood seasons were analyzed.The results show that(1)the peaks of hourly average precipitation and frequency showed a"high-low-high"pattern in the spatial distribution from south to north in Guangxi,while the daily peaks of precipitation intensity are high in the south and low in the north,with high-value areas appearing in the southeast and coastal region of Guangxi.(2)The peaks of hourly average precipitation in the northeast,northwest,and coastal region appeared at 04-09 BJT,in the southeast region at 15-17 BJT,in the southwest region at 05-07 BJT and 16-18 BJT.Therefore,there were more daytime rains in southeast Guangxi and more nighttime rains in other areas.The precipitation intensity was most obvious in the coastal areas,followed by southeast and southwest Guangxi,while it was not significant in the northeast and northwest areas.The variations of precipitation changes were closely related to the geographical location and influencing synoptic systems.The peak of hourly averaged precipitation and precipitation intensity occurred from May to June in the northeast and northwest Guangxi,which was associated with the front and monsoon,but appeared from June to August in the other areas which was related to monsoon and tropical systems.
作者
廖胜石
卓健
陆甲
Liao Shengshi;Zhuo Jian;Lu Jia(Guangxi Climate Center,Nanning 530022,China;Guangxi Meteorological Information Center,Nanning 530022,China)
出处
《气象研究与应用》
2023年第2期27-32,共6页
Journal of Meteorological Research and Application
基金
广西气象科研计划项目(桂气科2022Z03、桂气科2022M29)
中国气象局复盘总结专项(FPZJ2023-099)
关键词
广西
降水
日变化
降水强度
降水频率
Guangxi
precipitation
diurnal variation
precipitation intensity
precipitation frequency
作者简介
廖胜石(1976—),男,高级工程师,主要从事气候监测与评价研究。E-mail:lss0218@126.com
