05 Mar 2021

05 Mar 2021

Review status: this preprint is currently under review for the journal BG.

Extreme events driving year-to-year differences in gross primary productivity across the US

Alexander J. Turner1, Philipp Köhler2, Troy S. Magney3, Christian Frankenberg2,4, Inez Fung5, and Ronald C. Cohen5,6 Alexander J. Turner et al.
  • 1Department of Atmospheric Sciences, University of Washington, Seattle, WA, 98195, USA
  • 2Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, 91226, USA
  • 3Department of Plant Sciences, University of California, Davis, CA, 95616, USA
  • 4Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, 91109, USA
  • 5Department of Earth and Planetary Sciences, University of California, Berkeley, CA, 94720, USA
  • 6College of Chemistry, University of California, Berkeley, CA, 94720, USA

Abstract. Solar-Induced chlorophyll Fluorescence (SIF) has previously been shown to strongly correlate with gross primary productivity (GPP), however this relationship has not yet been quantified for the recently launched TROPOspheric Monitoring Instrument (TROPOMI). Here we use a Gaussian mixture model to develop a parsimonious relationship between SIF from TROPOMI and GPP from flux towers across the conterminous United States (CONUS). The mixture model indicates the SIF-GPP relationship can be characterized by a linear model with two terms. We then estimate GPP across CONUS at 500-m spatial resolution over a 16-day moving window. We find that CONUS GPP varies by less than 4 % between 2018 and 2019. However, we observe four extreme precipitation events that induce regional GPP anomalies: drought in west Texas, flooding in the midwestern US, drought in South Dakota, and drought in California. Taken together, these events account for 28 % of the year-to-year GPP differences across CONUS.

Alexander J. Turner et al.

Status: open (until 16 Apr 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on bg-2021-49', Anonymous Referee #1, 28 Mar 2021 reply

Alexander J. Turner et al.

Video supplement

Daily 500-m GPP across CONUS inferred from TROPOMI SIF Alexander Turner, Philipp Koehler, Troy Magney, Christian Frankenberg, Inez Fung, and Ron Cohen

Alexander J. Turner et al.


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Short summary
This work builds a high-resolution estimate (500-m) of gross primary productivity (GPP) over the United States using satellite measurements of solar-induced chlorophyll fluorescence from TROPOMI between 2018 and 2020. We identify ecosystem-specific scaling factors for estimating GPP from TROPOMI SIF. We find that extreme precipitation events drive four regional GPP anomalies that account for 28 % of the year-to-year differences in GPP across the United States.