蒸发量季节变化特点与干旱发生关系的初步分析

通过对广西灵山县1997～2007年E601蒸发器逐句蒸发量及同期的旬降雨量、气温、日照时数、相对湿度、风速等资料的分析,结果表明:蒸发量大小与气温、日照时数关系密切,而且蒸发量的季节变化与气温、日照时数等季节变化同步.在此基础上,分析了降水量与蒸发量差值的大小与农业干旱发生关系,应用水量亏欠量比现行的干旱指标更能真实反映当地农业干旱发生的实际情况,对开展气象专项服务有积极的参考意义.

Seasonal Characteristics of EVaporation and Its Effects on Drought

Based on analyses of the meteorological data such as ten days average evaporation,precipitation,temperature,sunlight hours,relative humidity,wind speed etc.,of the Lingshan weather station from 1997 to 2007,it shows that evaporation has close relation with temperature,sunlight hours,and their seasonal variations are synchronous.On the basis of this result,the relationship between the discrepancy of evaporation and precipitation and agricultural drought is studied.The conclusion shows: watering shortage is better than the current dry index in indicating the agricultural drought.