河南省汛期降水的日变化特征  

Diurnal Variations of Precipitation in Flood Season of He'nan Province

作　　者：王新伟 杜明哲 肖瑶 WANG Xinwei;DU Mingzhe;XIAO Yao(He＇ nan Key laboratory of Agrometeorological Support and Application Technique,CMA,Zhengzhou 450003,China;He＇ nan Provincial Meteorological Service Center,Zhengzhou 450003,China)

机构地区：[1]中国气象局(河南)农业气象保障与应用技术重点实验室,河南郑州450003 [2]河南省气象服务中心,河南郑州450003

出　　处：《干旱气象》2018年第3期383-389,共7页Journal of Arid Meteorology

基　　金：国家重点基础研究发展规划项目(973计划)(2013CB430105);河南省科技攻关项目(172102310071);河南省气象科技研究项目(KQ201736)共同资助

摘　　要：利用1971—2010年汛期河南省111个观测站的逐小时降水资料,分析了河南省汛期降水的日变化特征。结果表明:河南省汛期降水量和降水频率日峰值均从南向北递减;黄河流域降水量日峰值明显小于淮河流域,南阳盆地的降水量日峰值大多出现在凌晨,豫西山地大多出现在傍晚,豫南大部分地区则出现在下午;豫南地区的降水频率日峰值最大,南阳盆地和豫西山地次之,全省大部分地区降水频率日峰值出现时间集中在上午;降水量、降水频率和降水强度的日变化呈双峰值特征,均在凌晨和傍晚出现峰值,凌晨的峰值最大;长持续性降水对河南省汛期降水量的贡献大于短时降水。The diurnal variations of precipitation in flood seasons in He＇nan Province were analyzed using the hourly rainfall data of 111 meteorological stations during 1971-2010. The results show that the daily peaks of precipitation and precipitation frequency decreased from south to north. In terms of the rainfall amount,the daily peak value in the Yellow River basin was obviously smaller than that in the Huaihe basin. Besides,the daily peak values in Nanyang basin,mountain regions in western He＇nan and most parts of southern He＇nan always occurred in the wee hours,at dusk and in the afternoon,respectively. For precipitation frequency,the daily peak in southern He＇nan was the largest,followed by the Nanyang basin and the mountain areas of western He＇nan. In most regions,the daily peak occurred in the morning. Two maximum values appeared in precipitation,precipitation frequency and precipitation intensity within one day,which peaked in the early morning and at dusk. Further analysis of the rainfall amounts indicated that the long-term precipitation contributed more significantly to precipitation in flood season in He＇nan than that of short-term precipitation.

关 键 词：降水 日变化 河南 持续性降水 

分 类 号：P426.6[天文地球—大气科学及气象学]