利用美国通量观测站点数据对MOD16蒸散发产品的质量评估
Evaluation of MODIS MOD16 Evaportranspiration Product Using AmeriFlux
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。
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
周正昊、王文、姜艳阳
环境科学理论环境科学技术现状
水利工程MODIS数据蒸散发AmeriFlux
hydraulic engineeringMODISEvapotranspirationAmeriFlux
周正昊,王文,姜艳阳.利用美国通量观测站点数据对MOD16蒸散发产品的质量评估[EB/OL].(2017-05-04)[2025-08-18].http://www.paper.edu.cn/releasepaper/content/201705-281.点此复制
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