Analysis on Hourly Variation of Precipitation in Tibet
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Graphical Abstract
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Abstract
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 precipitation of sites where in relatively flat region more dispersed.2) Hourly precipitation amount ratios exhibited that heavy rainfall is grouped in short term during the summer, which displayed the characteristics 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.
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