Global GOSAT, OCO-2, and OCO-3 solar-induced chlorophyll fluorescence datasets

Creators: Doughty, Russell; Kurosu, Thomas P.; Parazoo, Nicholas; Köhler, Philipp; Wang, Yujie; Sun, Ying; Frankenberg, Christian

Abstract

The retrieval of solar-induced chlorophyll fluorescence (SIF) from space is a relatively new advance in Earth observation science, having only become feasible within the last decade. Interest in SIF data has grown exponentially, and the retrieval of SIF and the provision of SIF data products has become an important and formal component of spaceborne Earth observation missions. Here, we describe the global Level 2 SIF Lite data products for the Greenhouse Gases Observing Satellite (GOSAT), the Orbiting Carbon Observatory-2 (OCO-2), and Orbiting Carbon Observatory-3 (OCO-3) platforms, which are provided for each platform in daily netCDF files (Frankenberg, 2022, https://doi.org/10.22002/D1.8771; OCO-2 Science Team et al., 2020, https://doi.org/10.5067/XO2LBBNPO010; OCO-3 Science Team et al., 2020, https://doi.org/10.5067/NOD1DPPBCXSO). We also outline the methods used to retrieve SIF and estimate uncertainty, describe all the data fields, and provide users with the background information necessary for the proper use and interpretation of the data, such as considerations of retrieval noise, sun sensor geometry, the indirect relationship between SIF and photosynthesis, and differences among the three platforms and their respective data products. OCO-2 and OCO-3 have the highest spatial resolution of spaceborne SIF retrievals to date, and the target and snapshot area mode observation modes of OCO-2 and OCO-3 are unique. These modes provide hundreds to thousands of SIF retrievals at biologically diverse global target sites during a single overpass, and provide an opportunity to better inform our understanding of canopy-scale vegetation SIF emission across biomes.

Additional Information

© Author(s) 2022. This work is distributed under the Creative Commons Attribution 4.0 License. Received: 13 Jul 2021 – Discussion started: 29 Sep 2021 – Revised: 07 Mar 2022 – Accepted: 10 Mar 2022 – Published: 05 Apr 2022. We thank Lan Dang, for helping to process the GOSAT data, Annmarie Eldering, for helping coordinate the publication of the SIF Lite files at the GES DISC, and Yi Yin, for publishing the GOSAT data on the Caltech data repository. Part of this research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. This research has been supported by NASA Making Earth System data Records for Use in Research Environments (MEaSUREs) Program (grant no. 17-MEASURES-0032) and the NASA OCO Science Team (grant no. 80NSSC18K0895). Author contributions. RD and CF conceived this paper. TPK prepared and provided the data, and RD performed the analysis. RD prepared the paper, with contributions from all co-authors. Data availability. OCO-2 SIF Lite files can be accessed at https://doi.org/10.5067/XO2LBBNPO010 (OCO-2 Science Team et al., 2020), and OCO-3 data can be accessed at https://doi.org/10.5067/NOD1DPPBCXSO (OCO-3 Science Team et al., 2020). GOSAT SIF Lite files can be accessed at https://doi.org/10.22002/D1.8771 (Frankenberg, 2022). The supplement related to this article is available online at: https://doi.org/10.5194/essd-14-1513-2022-supplement. The contact author has declared that neither they nor their co-authors have any competing interests. Review statement. This paper was edited by Yuyu Zhou and reviewed by three anonymous referees.

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