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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。
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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
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