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Modeling global carbon and water fluxes and hyperspectral canopy radiative transfer simultaneously using a next generation land surface model---CliMA Land
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  • Yujie Wang,
  • Renato Kerches Braghiere,
  • Marcos Longo,
  • Alexander Norton,
  • Philipp Köhler,
  • Russell Doughty,
  • Yi Yin,
  • A. Anthony Bloom,
  • Christian Frankenberg
Yujie Wang
California Institute of Technology

Corresponding Author:[email protected]

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Renato Kerches Braghiere
NASA Jet Propulsion Laboratory
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Marcos Longo
NASA Jet Propulsion Laboratory
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Alexander Norton
Unknown
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Philipp Köhler
California Institute of Technology
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Russell Doughty
California Institute of Technology
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Yi Yin
California Institute of Technology
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A. Anthony Bloom
Jet Propulsion Laboratory, California Institute of Technology
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Christian Frankenberg
California Institute of Technology
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Abstract

Recent progress in satellite observations has provided unprecedented opportunities to monitor vegetation activity on the global scale. However, a major challenge in fully utilizing remotely sensed data to constrain land surface models (LSMs) lies in inconsistencies between simulated and observed quantities. Transpiration and gross primary productivity (GPP) that traditional LSMs simulate are not directly measurable from space and they are inferred from spaceborne observations using assumptions that are inconsistent with those of the LSMs, whereas canopy reflectance and fluorescence spectra that satellites can detect are not modeled by traditional LSMs. To bridge these quantities, we present the land model developed within the Climate Modeling Alliance (CliMA), which simulates global-scale GPP, transpiration, and hyperspectral canopy radiative transfer (RT). Thus, CliMA Land can predict any vegetation index or outgoing radiance, including solar-induced chlorophyll fluorescence (SIF), normalized difference vegetation index (NDVI), enhanced vegetation index (EVI), and near infrared reflectance of vegetation (NIRv) for any given measurement geometry. Even without parameter optimization, the modeled spatial patterns of CliMA Land GPP, SIF, NDVI, EVI, and NIRv correlate significantly with existing observational products. CliMA Land is also very useful in its high temporal resolution, e.g., providing insights into when GPP, SIF, and NIRv diverge. Based on comparisons between models and observations, we propose ways to improve future land modeling regarding data processing and model development.