ePrints@IIScePrints@IISc Home | About | Browse | Latest Additions | Advanced Search | Contact | Help

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).

[img] PDF
geo_res_let_47-7_2020.pdf - Published Version
Restricted to Registered users only

Download (4MB) | Request a copy
grl60362-sup-0001-2020gl087474-si.pdf - Published Supplemental Material

Download (1MB) | Preview
Official URL: https://doi.org/10.1029/2020GL087474


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

Actions (login required)

View Item View Item