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

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