摘要
降水日变化特征的研究,不但有助于理解降水形成机理和区域气候形成机制,而且有助于验证数值模式某些物理过程参数化方案的合理性。以辽宁省为研究区域,利用2008~2017年60个国家气象观测站的逐时降水观测资料,对辽宁省夏季降水的降水量、降水频率、降水强度的日变化特征进行统计分析。研究结果表明:辽宁省夏季气候平均降水量和降水频率日峰值大体上呈现出由东向西逐渐减小的空间分布,而降水强度日峰值的高值区大多出现在山地与平原的交界处;辽宁省夏季降水量和降水频率日变化呈现典型的双峰结构,峰值出现在清晨和傍晚,而降水强度则在傍晚有一个明显的峰值。辽宁省不同区域的降水日变化特征存在差异,辽西地区和辽中内陆地区的降水量和降水频率都以傍晚的日峰值所主导,而辽东地区和辽中沿海地区主要以清晨的日峰值为主。长时降水(≥7h)对辽宁省夏季总降水的贡献大于短时降水(1~3h),长时降水对降水量清晨的峰值贡献较大,而短时降水对傍晚的峰值影响更大。L1级(0.1~10mm·h^(-1))降水对辽宁省夏季总降水的贡献最大,并主导了辽宁省夏季降水量日变化特征。
The study of the diurnal variation of precipitation not only helps to understand the mechanism of precipitation formation and regional climate formation,but also helps to verify the rationality of some parameterization schemes of physical processes in numerical models.Based on the hourly precipitation data from 60 national meteorological stations in Liaoning Province during 2008-2017,the diurnal variation characteristics of precipitation,precipitation frequency and precipitation intensity of summer precipitation in Liaoning Province were analyzed.The results showed that:Daily peaks of precipitation amount and precipitation frequency in Liaoning Province decreases gradually from east to west,while the high peaks of precipitation intensity occur at the junction of mountains and plains.The diurnal variation of summer precipitation amount and precipitation frequency have two peaks that occur in the early morning and late afternoon,while the precipitation intensity has one peak that occur in the late afternoon.The rainfall diurnal variation in Liaoning Province presents distinct regional features.The precipitation amount and frequency in western and central inland are dominated by the diurnal peak in the late afternoon,while in eastern and central coastal are dominated by the diurnal peak in the morning.The contribution of long-duration precipitation(≥7h)to the summer total precipitation is greater than that of short-duration precipitation(1-3h).Long-duration precipitation has a greater contribution to the peak of precipitation amount in the morning,while short-duration precipitation has a greater contribution to the peak of precipitation amount in the late afternoon.L1 level(0.1-10mm·h^(-1))precipitation contributes most to the summer total precipitation and dominates the diurnal variation of summer precipitation amount.
作者
李晓婷
刘利民
李雪洋
王婷婷
肇同斌
LI Xiao-ting;LIU Li-min;LI Xue-yang;WANG Ting-ting;ZHAO Tong-bin(College of Agronomy,Shenyang Agricultural University,Shenyang 110161,China;Tieling Meteorological Bureau,Tieling Liaoning 112600,China;Benxi Meteorological Bureau,Benxi Liaoning 117000,China;Liaoning Meteorological Information Center,Shenyang 110000,China)
出处
《沈阳农业大学学报》
CAS
CSCD
北大核心
2021年第2期129-136,共8页
Journal of Shenyang Agricultural University
基金
国家重点研发计划项目(2019YFD1002204)
国家自然科学基金面上项目(31070429)。
关键词
辽宁省
降水
日变化
降水等级
降水持续时间
Liaoning Province
precipitation
diurnal variation
precipitation level
precipitation duration
