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Title: Satellite solar-induced chlorophyll fluorescence and near-infrared reflectance capture complementary aspects of dryland vegetation productivity dynamics

Journal Article · · Remote Sensing of Environment
 [1];  [2];  [3];  [2];  [4];  [5];  [6];  [6];  [7];  [8];  [9];  [9];  [10];  [11];  [1];  [1]
  1. University of Arizona, Tucson, AZ (United States)
  2. US Department of Agriculture (USDA), Tucson, AZ (United States). Agricultural Research Service (ARS)
  3. US Department of Agriculture (USDA), Tucson, AZ (United States). Agricultural Research Service (ARS); University of Arizona, Tucson, AZ (United States)
  4. University of Washington, Seattle, WA (United States)
  5. University of Iowa, Iowa City, IA (United States)
  6. California Institute of Technology (CalTech), Pasadena, CA (United States)
  7. University of New Mexico, Albuquerque, NM (United States)
  8. US Department of Agriculture (USDA), Boise, ID (United States). Agricultural Research Service (ARS)
  9. Oregon State University, Corvallis, OR (United States)
  10. US Geological Survey, Moab, UT (United States)
  11. Colorado State University, Fort Collins, CO (United States)

Mounting evidence indicates dryland ecosystems play an important role in driving the interannual variability and trend of the terrestrial carbon sink. Nevertheless, our understanding of the seasonal dynamics of dryland ecosystem carbon uptake through photosynthesis [gross primary productivity (GPP)] remains relatively limited due in part to the limited availability of long-term data and unique challenges associated with satellite remote sensing across dryland ecosystems. Here, we comprehensively evaluated longstanding and emerging satellite vegetation proxies in their ability to capture seasonal dryland GPP dynamics. Specifically, we evaluated: 1) reflectance-based proxies normalized difference vegetation index (NDVI), soil adjusted vegetation index (SAVI), near infrared reflectance index (NIRv), and kernel NDVI (kNDVI) from the MODerate resolution Imaging Spectroradiometer (MODIS); and 2) newly available physiologically-based proxy solar-induced chlorophyll fluorescence (SIF) from the TROPOspheric Monitoring Instrument (TROPOMI). As a performance benchmark, we used GPP estimates from a robust network of 21 western United States eddy covariance tower sites that span representative gradients in dryland ecosystem climate and functional composition. We found that NIRv and SIF were the best performing GPP proxies and captured complementary aspects of seasonal GPP dynamics across dryland ecosystem types. NIRv offered better performance than the other proxies across relatively low-productivity, sparsely non-evergreen vegetated sites (R2 = 0.59 ± 0.13); whereas SIF best captured seasonal dynamics across relatively high-productivity sites, including evergreen-dominated sites (R2 = 0.74 ± 0.07). Notably, across grass-dominated sites, all reflectance-based proxies (NDVI, SAVI, NIRv and kNDVI) showed significant seasonal bias (hysteresis) that strengthened with the total fraction of woody vegetation cover, likely due to seasonal patterns in woody vegetation reflectance that are unrelated to or decoupled from GPP. In conclusion, future efforts to fully integrate the complementary strengths of NIRv and SIF could significantly improve our understanding and representation of dryland GPP dynamics in satellite-based models.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). AmeriFlux
Sponsoring Organization:
National Aeronautics and Space Administration (NASA); US Department of Agriculture (USDA); US Geological Survey; USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1981744
Journal Information:
Remote Sensing of Environment, Journal Name: Remote Sensing of Environment Journal Issue: C Vol. 270; ISSN 0034-4257
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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