利用美国通量观测站点数据对MOD16蒸散发产品的质量评估
首发时间:2017-05-04
摘要:MODIS MOD16蒸散发产品是目前广泛使用的全球蒸散发数据。利用美国通量观测站点数据(OB_ET),对MOD16 8天尺度数据进行质量评估,主要从相关系数、平均偏差、相对绝对误差以及均方根误差4个方面进行一致性分析。评估角度分为海拔、气候类型以及植被类型三个角度,将产品数据与观测数据进行对比发现:(1)MOD16_ET 8天尺度数据与GLDAS_ET、OB_ET相比,季节性波动被弱化;(2)从高程分区来看,在中低海拔区(0~500m)MOD16_ET与OB_ET数据相比高估,但在高海拔区(>500m)则呈现低估;(3)从气候类型来看,在地中海气候区,MOD16_ET与OB_ET两种ET一致性较好;(4)从不同植被类型来看,在GRA、CRO、CSH以及DBF植被类型下,ET产品值与观测值的有较高的相关性,而在EBF以及ENF常绿型植被覆盖类型下的相关性较弱。
关键词: 水利工程 MODIS数据; 蒸散发; AmeriFlux
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Evaluation of MODIS MOD16 Evaportranspiration Product Using AmeriFlux
Abstract:MODIS MOD16 evapotranspiration product is currently widely used as global evapotranspiration data. The evaluation of MOD16 8 - day scale data using observation data from AmeriFlux (OB_ET), explained mainly from three points of view of altitude, climate type and vegetation type, using four evaluation indexes: correlation coefficient, mean deviation, relative absolute error and root mean square error. The conclusions included four points. (1) Comparing with GLDAS_ET and OB_ET, the seasonal fluctuation of MOD16_ET 8-day scale data is weakened; (2) From different elevation, MOD16_ET 8-day scale data is overestimated in mid and low altitude area(0~500m)compared with OB_ET, while underestimated in high altitude area(> 500m); (3) From different climate types, MOD16_ET was in good accordance with OB_ET in Mediterranean climate zone (4) From the different vegetation types, the ET product value had a high correlation with OB_ET under the GRA, CRO, CSH and DBF vegetation types, and the correlation between the MOD16_ET and the OB_ET, while under EBF and ENF evergreen vegetation cover types are weak
Keywords: hydraulic engineering MODIS Evapotranspiration AmeriFlux
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