From the Ground to Space: Using Solar-Induced Chlorophyll Fluorescence to Estimate Crop Productivity

He, L and Magney, T and Dutta, D and Yin, Y and Köhler, P and Grossmann, K and Stutz, J and Dold, C and Hatfield, J and Guan, K and Peng, B and Frankenberg, C (2020) From the Ground to Space: Using Solar-Induced Chlorophyll Fluorescence to Estimate Crop Productivity. In: Geophysical Research Letters, 47 (7).

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Abstract

Timely and accurate monitoring of crops is essential for food security. Here, we examine how well solar-induced chlorophyll fluorescence (SIF) can inform crop productivity across the United States. Based on tower-level observations and process-based modeling, we find highly linear gross primary production (GPP):SIF relationships for C4 crops, while C3 crops show some saturation of GPP at high light when SIF continues to increase. C4 crops yield higher GPP:SIF ratios (30�50) primarily because SIF is most sensitive to the light reactions (does not account for photorespiration). Scaling to the satellite, we compare SIF from the TROPOspheric Monitoring Instrument (TROPOMI) against tower-derived GPP and county-level crop statistics. Temporally, TROPOMI SIF strongly agrees with GPP observations upscaled across a corn and soybean dominated cropland (R2 = 0.89). Spatially, county-level TROPOMI SIF correlates with crop productivity (R2 = 0.72; 0.86 when accounting for planted area and C3/C4 contributions), highlighting the potential of SIF for reliable crop monitoring. ©2020. American Geophysical Union. All Rights Reserved.

Item Type:	Journal Article
Publication:	Geophysical Research Letters
Additional Information:	Copyright of this belongs to the American Geophysical Union
Keywords:	Chlorophyll; Fluorescence; Food supply; Productivity, Chlorophyll fluorescence; Crop monitoring; Crop productivity; Gross primary production; Monitoring instruments; Photorespiration; Planted areas; Process-based modeling, Crops, Glycine max; Zea mays
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	27 May 2021 13:19
Last Modified:	27 May 2021 13:19
URI:	http://eprints.iisc.ac.in/id/eprint/65284

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