Adjusting solar-induced fluorescence to nadir-viewing provides a better proxy for GPP

Hao, Dalei; Zeng, Yelu; Zhang, Zhaoying; Zhang, Yongguang; Qiu, Han; Biriukova, Khelvi; Celesti, Marco; Rossini, Micol; Zhu, Peng; Asrar, Ghassem R.; Chen, Min

doi:10.1016/j.isprsjprs.2022.01.016

Title: Adjusting solar-induced fluorescence to nadir-viewing provides a better proxy for GPP

Journal Article · 18 February 2022 · ISPRS Journal of Photogrammetry and Remote Sensing

DOI: https://doi.org/10.1016/j.isprsjprs.2022.01.016 · OSTI ID:1975779

Hao, Dalei ^[1]; Zeng, Yelu ^[2]; Zhang, Zhaoying ^[3]; Zhang, Yongguang ^[3]; Qiu, Han ^[2]; Biriukova, Khelvi ^[4]; Celesti, Marco ^[4]; Rossini, Micol ^[4]; Zhu, Peng ^[5]; Asrar, Ghassem R. ^[6]; Chen, Min ^[2]

Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); University of Wisconsin, Madison, WI (United States)
Nanjing University, Jiangsu (China)
University of Milano-Bicocca, Milano (Italy)
Laboratoire des Sciences du Climat et de l’Environnement, Gif-sur-Yvette (France)
University of Wisconsin, Madison, WI (United States)

Solar-induced fluorescence (SIF) provides key information for inferring terrestrial gross primary productivity (GPP). However, there is little research on analyzing the performance of nadir-adjusted SIF (SIF_nadir) on GPP, compared to total SIF emitted by all leaves (SIF_total) for reducing the viewing angle effects and estimating GPP. Besides, there have been controversial opinions on whether SIF_total is better correlated to GPP than raw SIF observations (SIF_obs). Here we systematically analyzed the relationship between raw/nadir/total SIF (i.e., SIF_obs, SIF_nadir and SIF_total) and GPP and investigated the underlying mechanism, using multi-angular field measurements and eddy covariance data in wheat and corn crops at sub-daily scale. We further compared the performance of SIF_obs, SIF_nadir and SIF_total in estimating GPP using the TROPOspheric Monitoring Instrument (TROPOMI) SIF and concurrent AmeriFlux measurements at daily scale. Furthermore, the results indicate that diurnal SIF_nadir has stronger correlations to GPP than SIF_obs for field measurements, with the increase of mean coefficient of determination (R²) by 0.05–0.07 for far-red band and 0.11–0.20 for red band. SIF_nadir shows comparable performance with SIF_total for both far-red and red bands. Although the viewing angle effects dominate the difference in estimating GPP between SIF_nadir and SIF_obs, the correlation between light use efficiency (LUE) and fesc further determines the different performance of SIF_nadir and SIF_total in estimating GPP. TROPOMI-based analysis further confirms that SIF_nadir overall has higher correlations to AmeriFlux GPP than SIF_obs for different plant functional types and shows similar performance with SIF_total. Compared to SIF_total, the estimation of SIF_nadir independent of viewing angle effects does not require any canopy structure parameters, and thus offers promising potential for reliably estimating regional and global GPP.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1975779

Report Number(s):: PNNL-SA-178556

Journal Information:: ISPRS Journal of Photogrammetry and Remote Sensing, Journal Name: ISPRS Journal of Photogrammetry and Remote Sensing Vol. 186; ISSN 0924-2716

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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54 ENVIRONMENTAL SCIENCES
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