From the Ground to Space: Using Solar-Induced Chlorophyll Fluorescence to Estimate Crop Productivity
| Autor: | Kaiyu Guan, Jerry L. Hatfield, Jochen Stutz, K. Grossmann, Yi Yin, Debsunder Dutta, Christian Dold, Philipp Köhler, Bin Peng, Liyin He, Troy S. Magney, Christian Frankenberg |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Troposphere
Geophysics 010504 meteorology & atmospheric sciences General Earth and Planetary Sciences Primary production Environmental science 010502 geochemistry & geophysics Atmospheric sciences 01 natural sciences Crop productivity Chlorophyll fluorescence 0105 earth and related environmental sciences |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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