ECOSTRESS: NASA's Next Generation Mission to Measure Evapotranspiration From the International Space Station
ECOSTRESS: NASA's Next Generation Mission to Measure Evapotranspiration From the International Space Station
复制标题
DOI：
10.1029/2019wr026058
复制
发表时间：
2020-04-01
影响因子：
5.4
通讯作者：
Hook, Simon
中科院分区：
文献类型：
--
作者：
Fisher, Joshua B.;Lee, Brian;Hook, Simon
2018年6月29日，美国国家航空航天局（NASA）向国际空间站发射了ECOSYSTEM星载热辐射计实验（ECOSTRESS）。ECOSTRESS的主要科学重点是蒸散（ET），它是作为第3级（L3）潜热通量（LE）数据产品产生的。这些数据是由2级地表温度和发射率产品（L2_LSTE）以及辅助地表和大气数据生成的。在这里，我们提供了全球ECOSTRESS晴空ET产品（L3_ET_PT-JPL，版本6.0）的第一次验证（第一阶段，初步）对LE测量在世界各地的82涡度协方差网站。总的来说，ECOSTRESS ET产品对现场测量表现良好（晴空瞬时/立交桥时间：r（2）= 0.88;总偏差= 8%;归一化均方根误差，RMSE = 6%）。ET的不确定性在气候带、生物群落类型和一天中的时间（ECOSTRESS对昼夜周期进行了采样）之间通常是一致的，尽管温带地区的代表性过高。70米高的空间分辨率的ECOSTRESS提高了85%的相关性，RMSE 62%，相对于1公里的像素。本文可作为ECOSTRESS L3 ET精度和后续科学使用这些数据的第一阶段验证状态的参考。关键点ECOSTRESS是最先进的热波段、空间和时间分辨率的组合，和测量的准确性和精确度来自82个涡度相关站点的数据与ECOSTRESS第一年的第一阶段验证同时合并。来自ECOSTRESS的天空ET与广泛的涡度协方差站点、植被类、气候带和一天中的时间进行了很好的比较
The ECOsystem Spaceborne Thermal Radiometer Experiment on Space Station (ECOSTRESS) was launched to the International Space Station on 29 June 2018 by the National Aeronautics and Space Administration (NASA). The primary science focus of ECOSTRESS is centered on evapotranspiration (ET), which is produced as Level-3 (L3) latent heat flux (LE) data products. These data are generated from the Level-2 land surface temperature and emissivity product (L2_LSTE), in conjunction with ancillary surface and atmospheric data. Here, we provide the first validation (Stage 1, preliminary) of the global ECOSTRESS clear-sky ET product (L3_ET_PT-JPL, Version 6.0) against LE measurements at 82 eddy covariance sites around the world. Overall, the ECOSTRESS ET product performs well against the site measurements (clear-sky instantaneous/time of overpass: r(2) = 0.88; overall bias = 8%; normalized root-mean-square error, RMSE = 6%). ET uncertainty was generally consistent across climate zones, biome types, and times of day (ECOSTRESS samples the diurnal cycle), though temperate sites are overrepresented. The 70-m-high spatial resolution of ECOSTRESS improved correlations by 85%, and RMSE by 62%, relative to 1-km pixels. This paper serves as a reference for the ECOSTRESS L3 ET accuracy and Stage 1 validation status for subsequent science that follows using these data.Key PointsECOSTRESS is a state-of-the-art combination of thermal bands, spatial and temporal resolutions, and measurement accuracy and precision Data from 82 eddy covariance sites were coalesced concurrently with the first year of ECOSTRESS for Stage 1 validation Clear-sky ET from ECOSTRESS compared well against a wide range of eddy covariance sites, vegetation classes, climate zones, and times of day