泾河流域温度与器皿蒸发量时空特征及变化趋势

利用泾河流域周边14个气象站点1957～2002年逐日温度、器皿蒸发数据,分析了近45 a来气温、器皿蒸发量的时空变化特征。Mann-Kendall统计检验结果表明：泾河流域气温变化趋势与同期我国气温变化趋势基本一致,年均温存在显著变暖的总趋势,增温率为0.29℃/10 a。流域北部气候变暖趋势高于流域南部,变暖的季节主要是秋冬季节。年器皿蒸发量呈逐渐减少的趋势,倾向率为-39.3 mm/10 a,在空间上变率表现为流域南部、北部减少趋势明显,中部变化趋势不明显。

Spatial Distribution and Temporal Trend of Temperature and Pan Evaporation in Jinghe River Basin

Using the monthly temperature and pan evaporation record from 14 meteorological stations in the Jinghe River basin from 1957 to 2002,the basic spatial distribution and temporal trend of temperature and pan evaporation were analyzed with the methods of climate tendency ratio and Mann-Kendall statistic test.The results show that the temperature in the studied area increases and accords basically with that all over the country in the past 45 years,and the temperature tendency ratio is 0.29 ℃/10 a.The temperature increase is most significant in winter,then in autumn,and the temperature increases gradually from the northwest to the southeast part of the basin and obvious especially in north part of the area.In contrast,the pan evaporation decreases in the temporal dimension and the tendency ratio is-39.3 mm/10 a.The spatial distribution of long-term trend shows a decrease tendency in the south and the north part of the basin,but it isn＇t obvious in the middle part.The evaporation change in the basin needs to take some other factors into consideration and the main cause for the change of evaporation will be further investigated in the further study.