近41a白洋淀湿地潜在蒸散量变化分析

利用白洋淀湿地内的安新气象站1972-2012年的逐日气象数据,运用趋势分析、标准差、Mann-Kendall突变检验、Morlet小波分析等方法,分析了白洋淀湿地的潜在蒸散量变化特征,结果表明：近41a来,白洋淀湿地的潜在蒸散量呈下降趋势,其中,年际、春季和秋季的潜在蒸散量随时间的变化减少明显,在对各季节潜在蒸散量的波动分析中,夏季的波动性最大,冬季的波动性最小；该湿地潜在蒸散量随时间的变化存在突变减少过程,其中,年潜在蒸散量在1988年下降显著,夏季在2001年下降显著,秋季在1991年下降显著；年潜在蒸散量存在8-10a的周期变化特征,春季潜在蒸散量存在5-7a左右的变化周期,夏季存在准8a左右的周期变化特征,秋季在90年代后存在准8a左右的周期特征,冬季存在准10a的变化周期。

The analysis of Potential Evapotranspiration of Baiyangdian marsh in rencet 41a

Based on the daily Meteorological data of AnXin Meteorological Observation Station in Baiyangdian marsh within 1972-2012 years, using trend analysis, standard deviation, Mann-Kendall mutation test and Morlet wavelet analysis method, this article analyzes the potential evapotranspiration variation in Baiyangdian marsh. The analyzation reveals that, in the nearly 41 years, the potential evapotranspiration in Baiyangdian Marshs shows a downward trend, especially when it comes to the inter-annual, spring and autumn. The fluctuation analysis of each season evapotranspiration reveals that the maximum volatility happens in summer, while the minimum in winter. The marsh evapotranspiration sometimes takes mutations reduce processes, like annual potential evapotranspiration decrease in 1988, summer potential evapotranspiration decrease in 2001, fall potential evapotranspiration decrease in 1991. The annual potential evapotranspiration variation takes a 8-10 years cycle, the spring potential evapotranspiration variation a 5-7 years cycle, the summer and autumn a 8 years cycle, and the winter a 10 years cycle.