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Title: Performance of Linear and Nonlinear Two-Leaf Light Use Efficiency Models at Different Temporal Scales

The reliable simulation of gross primary productivity (GPP) at various spatial and temporal scales is of significance to quantifying the net exchange of carbon between terrestrial ecosystems and the atmosphere. This study aimed to verify the ability of a nonlinear two-leaf model (TL-LUEn), a linear two-leaf model (TL-LUE), and a big-leaf light use efficiency model (MOD17) to simulate GPP at half-hourly, daily and 8-day scales using GPP derived from 58 eddy-covariance flux sites in Asia, Europe and North America as benchmarks. Model evaluation showed that the overall performance of TL-LUEn was slightly but not significantly better than TL-LUE at half-hourly and daily scale, while the overall performance of both TL-LUEn and TL-LUE were significantly better (p < 0.0001) than MOD17 at the two temporal scales. The improvement of TL-LUEn over TL-LUE was relatively small in comparison with the improvement of TL-LUE over MOD17. However, the differences between TL-LUEn and MOD17, and TL-LUE and MOD17 became less distinct at the 8-day scale. As for different vegetation types, TL-LUEn and TL-LUE performed better than MOD17 for all vegetation types except crops at the half-hourly scale. At the daily and 8-day scales, both TL-LUEn and TL-LUE outperformed MOD17 for forests. However, TL-LUEn hadmore » a mixed performance for the three non-forest types while TL-LUE outperformed MOD17 slightly for all these non-forest types at daily and 8-day scales. The better performance of TL-LUEn and TL-LUE for forests was mainly achieved by the correction of the underestimation/overestimation of GPP simulated by MOD17 under low/high solar radiation and sky clearness conditions. TL-LUEn is more applicable at individual sites at the half-hourly scale while TL-LUE could be regionally used at half-hourly, daily and 8-day scales. MOD17 is also an applicable option regionally at the 8-day scale.« less
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  1. Nanjing Univ. (China)
  2. Univ. of Montana, Missoula, MT (United States)
  3. Oregon State Univ., Corvallis, OR (United States)
  4. Univ. of British Columbia, Vancouver, BC (Canada)
  5. Laval Univ., Quebec City, QC (Canada)
  6. European Commission, Ispra (Italy). Joint Research Centre
  7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  8. Free Univ. of Bolzano, Bolzano (Italy); Autonomous Province of Bolzano (Italy). Forest Services
  9. North Carolina State Univ., Raleigh, NC (United States)
  10. Univ. of Minnesota, Minneapolis, MN (United States)
  11. Technical Univ. of Denmark, Lyngby (Denmark)
  12. Russian Academy of Sciences (RAS), Leniski (Russian Federation)
  13. Univ. of Tusckia, Viterbo (Italy)
  14. Univ. of Colorado, Boulder, CO (United States)
  15. Chinese Academy of Sciences (CAS), Beijing (China)
  16. Chinese Academy of Sciences (CAS), Shenyang (China)
  17. Chinese Academy of Sciences (CAS), Guangzhou (China)
  18. Chinese Academy of Sciences (CAS), Xining (China)
  19. Nanjing Univ. of Information Science and Technology, Nanjing (China)
Publication Date:
OSTI Identifier:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Remote Sensing
Additional Journal Information:
Journal Volume: 7; Journal Issue: 3; Journal ID: ISSN 2072-4292
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
54 ENVIRONMENTAL SCIENCES Gross primary productivity (GPP); Light use efficiency model; Sunlit and shaded leaves; Vegetation types; Temporal scales