Validity of Five Satellite-Based Latent Heat Flux Algorithms for Semi-arid Ecosystems

Feng, Fei; Chen, Jiquan; Li, Xianglan; Yao, Yunjun; Liang, Shunlin; Liu, Meng; Zhang, Nannan; Guo, Yang; Yu, Jian; Sun, Minmin

doi:10.3390/rs71215853

Title: Validity of Five Satellite-Based Latent Heat Flux Algorithms for Semi-arid Ecosystems

Journal Article · Wed Dec 09 00:00:00 EST 2015 · Remote Sensing

DOI:https://doi.org/10.3390/rs71215853· OSTI ID:1240607

Feng, Fei ^[1]; Chen, Jiquan ^[2]; Li, Xianglan ^[1]; Yao, Yunjun ^[1]; Liang, Shunlin ^[3]; Liu, Meng ^[4]; Zhang, Nannan ^[5]; Guo, Yang ^[1];

^[1]; Sun, Minmin ^[1]

Beijing Normal Univ. (China)
Michigan State Univ., East Lansing, MI (United States)
Beijing Normal Univ. (China); Univ. of Maryland, College Park, MD (United States)
Beijing Normal Univ. (China); Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China)
China Petroleum Pipeline Bureau, Beijing (China)

Accurate estimation of latent heat flux (LE) is critical in characterizing semiarid ecosystems. Many LE algorithms have been developed during the past few decades. However, the algorithms have not been directly compared, particularly over global semiarid ecosystems. In this paper, we evaluated the performance of five LE models over semiarid ecosystems such as grassland, shrub, and savanna using the Fluxnet dataset of 68 eddy covariance (EC) sites during the period 2000–2009. We also used a modern-era retrospective analysis for research and applications (MERRA) dataset, the Normalized Difference Vegetation Index (NDVI) and Fractional Photosynthetically Active Radiation (FPAR) from the moderate resolution imaging spectroradiometer (MODIS) products; the leaf area index (LAI) from the global land surface satellite (GLASS) products; and the digital elevation model (DEM) from shuttle radar topography mission (SRTM30) dataset to generate LE at region scale during the period 2003–2006. The models were the moderate resolution imaging spectroradiometer LE (MOD16) algorithm, revised remote sensing based Penman–Monteith LE algorithm (RRS), the Priestley–Taylor LE algorithm of the Jet Propulsion Laboratory (PT-JPL), the modified satellite-based Priestley–Taylor LE algorithm (MS-PT), and the semi-empirical Penman LE algorithm (UMD). Direct comparison with ground measured LE showed the PT-JPL and MS-PT algorithms had relative high performance over semiarid ecosystems with the coefficient of determination (R2) ranging from 0.6 to 0.8 and root mean squared error (RMSE) of approximately 20 W/m². Empirical parameters in the structure algorithms of MOD16 and RRS, and calibrated coefficients of the UMD algorithm may be the cause of the reduced performance of these LE algorithms with R2 ranging from 0.5 to 0.7 and RMSE ranging from 20 to 35 W/m² for MOD16, RRS and UMD. Sensitivity analysis showed that radiation and vegetation terms were the dominating variables affecting LE Fluxes in global semiarid ecosystem.

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Research Organization:: Oregon State Univ., Corvallis, OR (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: FG02-04ER63917

OSTI ID:: 1240607

Journal Information:: Remote Sensing, Vol. 7, Issue 12; ISSN 2072-4292

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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Title: Validity of Five Satellite-Based Latent Heat Flux Algorithms for Semi-arid Ecosystems

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