TY - JOUR
T1 - From the Ground to Space
T2 - Using Solar-Induced Chlorophyll Fluorescence to Estimate Crop Productivity
AU - He, Liyin
AU - Magney, Troy
AU - Dutta, Debsunder
AU - Yin, Yi
AU - Köhler, Philipp
AU - Grossmann, Katja
AU - Stutz, Jochen
AU - Dold, Christian
AU - Hatfield, Jerry
AU - Guan, Kaiyu
AU - Peng, Bin
AU - Frankenberg, Christian
N1 - Funding Information:
Part of this research was funded by the NASA Carbon Cycle Science program (grant NNX17AE14G). L.H. thanks the Resnick Sustainability Institute at Caltech for fellowship support. TROPOMI SIF data generation by P.K. and C.F. is funded by the Earth Science U.S. Participating Investigator program (grant NNX15AH95G). TROPOMI SIF product is available at ftp://fluo.gps.caltech.edu/data/tropomi/. County-level crop statistics is available at the USDA NASS Quick Stats Database (quickstats.nass.usda.gov). Crop-specific land cover data layer CDL can be accessed at https://nassgeodata.gmu.edu/CropScape/.
Funding Information:
Part of this research was funded by the NASA Carbon Cycle Science program (grant NNX17AE14G). L.H. thanks the Resnick Sustainability Institute at Caltech for fellowship support. TROPOMI SIF data generation by P.K. and C.F. is funded by the Earth Science U.S. Participating Investigator program (grant NNX15AH95G). TROPOMI SIF product is available at ftp:// fluo.gps.caltech.edu/data/tropomi/ . County‐level crop statistics is available at the USDA NASS Quick Stats Database ( quickstats.nass.usda.gov ). Crop‐specific land cover data layer CDL can be accessed at https://nassgeodata.gmu.edu/CropScape/ .
Publisher Copyright:
©2020. American Geophysical Union. All Rights Reserved.
PY - 2020/4/16
Y1 - 2020/4/16
N2 - 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.
AB - 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.
KW - crop monitoring
KW - fluorescence
KW - gross primary production
KW - net primary production
UR - http://www.scopus.com/inward/record.url?scp=85083517180&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85083517180&partnerID=8YFLogxK
U2 - 10.1029/2020GL087474
DO - 10.1029/2020GL087474
M3 - Letter
AN - SCOPUS:85083517180
SN - 0094-8276
VL - 47
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 7
M1 - e2020GL087474
ER -