摘要
本文选用2008、2009年西藏地区具有代表性的5个自动站夏季逐时降水资料分析了两年间逐小时降水出现的频数和降水比率。结果表明:(1)各站的夏季逐时降水频率特征不尽相同但也有规律可循,既处在河谷地区的站点多夜雨,在相对平缓地区的站点逐时降水频率较为分散;(2)各站的夏季逐时降水比率呈短时集中现象,表现出高原地区多短时强对流天气的特征;(3)在有降水发生时次地面温度跟逐时降水频次和降水比率呈良好的负相关,相关系数分别为-0.58、-0.44;相对湿度跟逐时降水频次和降水比率呈良好的正相关,相关系数分别为0.56、0.46。
This paper analyzed the hourly precipitation frequencies and amount ratios over 2 years in Tibet based on the hourly precipitation data of 5 weather stations from 2008 to 2009. The results indicated that ： 1 ） the maximum frequency of hourly precipitation is different in various areas. Sites in the valley tend to reach the high frequency in the nighttime. The pre- cipitation of sites where in relatively flat region more dispersed. 2） Hourly preclp^tatlon amount ratios exhibited that heavy rain- fall is grouped in short term during the summer, which displayed the characteristids of numerous strong convective weather over the Tibetan plateau areas. 3） The ground temperature was negatively related to the hourly precipitation frequency and intensity of precipitation. Correlation coefficients were -0.58, -0.44 respectively. Relative humidity has good positive correlation with hourly precipitation frequency and precipitation ratio. Correlation coefficients were 0.56, 0.46 respectively.
出处
《高原山地气象研究》
2012年第2期77-80,共4页
Plateau and Mountain Meteorology Research
基金
气象关键技术集成与应用(面上)项目(CMAGJ 2011M48)
公益性行业专项(GYHY201006054)
西藏自治区气象局局设项目(新一代天气雷达资料在拉萨地区短时临近预报中的应用)
甘肃省科技重大专项(1001JKDA001)
关键词
西藏地区
逐时降水频率
逐时降水比率
hourly precipitation frequency, hourly precipitation, Tibet
