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实际水汽压ea是Penman-Monteith公式中计算参考作物蒸发蒸腾量的重要过程参数.为了研究在湿度缺测条件下,露点温度法替代相对湿度法计算ea在我国长江三角洲地区的适用性,选用江苏南通2000~2004年的旬气象资料,采用FAO推荐的相对湿度法和露点温度法两种方法计算了实际水汽压ea和旬参考作物蒸发蒸腾量ET0,分析了这两种方法计算结果的误差及其与影响因素间的关系.结果表明:这两种方法计算结果间误差较小,有98%以上的计算结果其误差小于20%;实际水汽压间的误差差异与最高最低温差相关关系最强,旬参考作物蒸发蒸腾量间的误差差异与最低温度的相关性最强;在湿度缺测条件下,可以采用露点温度法替代相对湿度法计算ea并进一步计算ET0.
The actual vapor pressure ea is an important process parameter for calculating the reference crop evapotranspiration in the Penman-Monteith formula.In order to study the applicability of the dew point temperature method instead of the relative humidity method to calculate the ea in the Yangtze River Delta region in the absence of humidity, Nantong from 2000 to 2004 ten-day meteorological data, the use of FAO recommended relative humidity and dew point temperature method of two methods to calculate the actual vapor pressure ea and ten days of reference crop evapotranspiration ET0, analysis of the results of the two methods of error and The results show that the error between the two methods is small, and the error of the calculated results is less than 20% with more than 98%. The correlation between the actual water vapor pressure difference and the highest and lowest temperature difference is the strongest The difference of error between evapotranspiration and reference temperature is the strongest correlation with the lowest temperature. Under the conditions of humidity absent, dewpoint temperature can be used instead of relative humidity to calculate ea and calculate ET0 further.