基于EOF的淮河流域地表蒸散发时空格局变化分析

Spatio-temporal Analysis of Land Evapotranspiration over Huaihe River Basin Using Empirical Orthogonal Function

基于2000—2014年MOD16遥感蒸散发数据,利用经验正交函数(EOF),分析淮河流域年蒸散发时空分布特征。结果表明,淮河流域年蒸散发空间分布可由4个模态特征场来表现,其空间分布结构为全区一致型、东南至西北差异型、东南至西北相反型、南北相反型。各模态2000—2010年蒸散发均呈上升趋势,之后蒸散发呈下降趋势。

Annually spatial-temporal characteristics of land evapotranspiration （ET） over Huaihe River basin were analyzed based on MOD16 ET product during 2000-2014 using Empirical Orthogonal Function method （EOF）. Research results showed that annually spatial distribution of e- vapotranspiration over Huaihe River basin can be expressed by four model characteristics, including spatial distribution structure in the same type, the southeast and the northwest opposite type, the southeast and the northwest opposite type, the north and the south opposite type. Major modes presented that the land evanotranspiration had upward trend in the first decade of the 21st century, and then decreased.