中国西北地区ET0多尺度分析

摘要

基于西北地区1978～2008年30个典型气象站逐日观测资料,应用FAO-56分册推荐的PenmanMonteith公式,计算得出各站历年逐日参考作物蒸发蒸腾量ET0.应用Mann-Kendall检验法和小波变换方法分别分析西北地区ET0序列的变化趋势以及周期特性和突变特性.结果表明,西北地区该时期ET0序列主要存在尺度为27年、9年和4年的周期变化,其变化趋势达到显著水平,1978～1988年下降趋势明显,1998～2008年上升趋势明显.%Based on the daily meteorological data of 30 stations all over northwest China, daily reference evapotranspiration (ET0) was estimated by using the FAO Penman -Monteith equation. The Mann-Kendall mutation test and the method of wavelet transformation were applied to analyze the trend, periodicity and mutations of ET0 time series in northwest China. The solution showed that the main periods of reference evapotranspiration were around 27 years, 9 years and 4 years. The test showed that the significance of the ET0 time series were at 95%. There were obvious drop trends from 1978 to 1988 and up trends from 1998 to 2008.