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Systematic Orbital Geometry-Dependent Variations in Satellite Solar-Induced Fluorescence (SIF) Retrievals

Joiner, Joanna and Yoshida, Yasuko and Köehler, Philipp and Campbell, Petya and Frankenberg, Christian and van der Tol, Christiaan and Yang, Peiqi and Parazoo, Nicholas and Guanter, Luis and Sun, Ying (2020) Systematic Orbital Geometry-Dependent Variations in Satellite Solar-Induced Fluorescence (SIF) Retrievals. Remote Sensing, 12 (15). Art. No. 2346. ISSN 2072-4292. https://resolver.caltech.edu/CaltechAUTHORS:20200722-150848045

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Abstract

While solar-induced fluorescence (SIF) shows promise as a remotely-sensed measurement directly related to photosynthesis, interpretation and validation of satellite-based SIF retrievals remains a challenge. SIF is influenced by the fraction of absorbed photosynthetically-active radiation at the canopy level that depends upon illumination geometry as well as the escape of SIF through the canopy that depends upon the viewing geometry. Several approaches to estimate the effects of sun-sensor geometry on satellite-based SIF have been proposed, and some have been implemented, most relying upon satellite reflectance measurements and/or other ancillary data sets. These approaches, designed to ultimately estimate intrinsic or physiological components of SIF related to photosynthesis, have not generally been applied globally to satellite measurements. Here, we examine in detail how SIF and related reflectance-based indices from wide swath polar orbiting satellites in low Earth orbit vary systematically due to the host satellite orbital characteristics. We compare SIF and reflectance-based parameters from the Global Ozone Mapping Experiment 2 (GOME-2) on the MetOp-B platform and from the TROPOspheric Monitoring Instrument (TROPOMI) on the Sentinel 5 Precursor satellite with a focus on high northern latitudes in summer where observations at similar geometries and local times occur. We show that GOME-2 and TROPOMI SIF observations agree nearly to within estimated uncertainties when they are compared at similar observing geometries. We show that the cross-track dependence of SIF normalized by PAR and related reflectance-based indices are highly correlated for dense canopies, but diverge substantially as the vegetation within a field-of-view becomes more sparse. This has implications for approaches that utilize reflectance measurements to help account for SIF geometrical dependences in satellite measurements. To further help interpret the GOME-2 and TROPOMI SIF observations, we simulated cross-track dependences of PAR normalized SIF and reflectance-based indices with the one dimensional Soil-Canopy Observation Photosynthesis and Energy fluxes (SCOPE) canopy radiative transfer model at sun–satellite geometries that occur across the wide swaths of these instruments and examine the geometrical dependencies of the various components (e.g., fraction of absorbed PAR, SIF yield, and escape of SIF from the canopy) of the observed SIF signal. The simulations show that most of the cross-track variations in SIF result from the escape of SIF through the scattering canopy and not the illumination.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3390/rs12152346DOIArticle
ORCID:
AuthorORCID
Joiner, Joanna0000-0003-4278-1020
Yoshida, Yasuko0000-0003-0698-9115
Köehler, Philipp0000-0002-7820-1318
Frankenberg, Christian0000-0002-0546-5857
Parazoo, Nicholas0000-0002-4424-7780
Guanter, Luis0000-0002-8389-5764
Sun, Ying0000-0002-9819-1241
Additional Information:© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). Received: 1 June 2020; Accepted: 13 July 2020; Published: 22 July 2020. We thank EUMETSAT and ESA for making possible the distribution of the high quality GOME-2 and TROPOMI data sets, respectively, used in this study. This work was supported by the NASA Making Earth System Data Records for Use in Research Environments (MEaSUREs), Earth Science US Participating Investigator (ESUSPI), and Arctic-Boreal Vulnerability Experiment (ABoVE) and Multi-Source Land Imaging (MuSLI) programs, specifically grants ABoVE 80NSSC19M0110 and MuSLI 80NSSC18K0337. PY was funded by the Netherlands Organization for Scientific Research (NWO), project ALWGO.2018.018. Author Contributions: Conceptualization, J.J. and Y.Y.; Methodology: J.J., Y.Y., C.v.d.T., P.Y., P.K., C.F., Y.S.; Software, J.J., Y.Y., C.v.d.T., P.Y., P.K., C.F., and L.G.; Formal analysis, J.J., Y.Y., P.Y., C.v.d.T., and P.C.; Investigation: J.J., Y.Y., C.v.d.T., and P.Y.; Visualization: J.J., Y.Y., C.v.d.T, and P.Y.; Writing - Original Draft Preparation: J.J. and Y.Y.; Writing - Review & Editing, J.J., Y.Y., C.v.d.T., P.Y., P.K., C.F., P.C., Y.S., L.G., and N.P.; Project Administration: N.P.; Funding Acquisition: N.P., C.F., P.K., J.J., Y.S.,and C.v.d.T.; Data Curation: J.J., P.K. and C.F. All authors have read and agreed to the published version of the manuscript. No potential conflict of interest was reported by the authors. The founding sponsors had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, and in the decision to publish the results.
Funders:
Funding AgencyGrant Number
NASA80NSSC19M0110
NASA80NSSC18K0337
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)ALWGO.2018.018
Subject Keywords:solar-induced fluorescence; satellite remote sensing; SIF; reflectance; GOME-2; TROPOMI; BRDF; LAI; leaf area index; bidrectional reflectance
Issue or Number:15
Record Number:CaltechAUTHORS:20200722-150848045
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200722-150848045
Official Citation:Joiner, J.; Yoshida, Y.; Köehler, P.; Campbell, P.; Frankenberg, C.; van der Tol, C.; Yang, P.; Parazoo, N.; Guanter, L.; Sun, Y. Systematic Orbital Geometry-Dependent Variations in Satellite Solar-Induced Fluorescence (SIF) Retrievals. Remote Sens. 2020, 12, 2346
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104520
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:22 Jul 2020 22:16
Last Modified:22 Jul 2020 22:16

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