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  Overview of Solar-Induced chlorophyll Fluorescence (SIF) from the orbiting carbon observatory-2: Retrieval, cross-mission comparison, and global monitoring for GPP

Sun, Y., Frankenberg, C., Jung, M., Joiner, J., Guanter, L., Kohler, P., et al. (2018). Overview of Solar-Induced chlorophyll Fluorescence (SIF) from the orbiting carbon observatory-2: Retrieval, cross-mission comparison, and global monitoring for GPP. Remote Sensing of Environment, 209, 808-823. doi:10.1016/j.rse.2018.02.016.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-4630-A Version Permalink: http://hdl.handle.net/21.11116/0000-0001-4631-9
Genre: Journal Article

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 Creators:
Sun, Ying, Author
Frankenberg, Christian, Author
Jung, Martin1, Author              
Joiner, Joanna, Author
Guanter, Luis, Author
Kohler, Philipp, Author
Magney, Troy, Author
Affiliations:
1Global Diagnostic Modelling, Dr. Martin Jung, Department Biogeochemical Integration, Dr. M. Reichstein, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1938311              

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 Abstract: The Orbiting Carbon Observatory-2 (OCO-2), launched in July 2014, is capable of measuring Solar-Induced chlorophyll Fluorescence (SIF), a functional proxy for terrestrial gross primary productivity (GPP). Although its primary mission is to measure the column-averaged mixing ratio of CO 2 (Xco 2 ) to constrain global carbon source/sink distribution, one of the OCO-2 spectrometers allows for a robust SIF retrieval solely based on solar Fraunhofer lines. Here we present a technical overview of the OCO-2 SIF product, aiming to provide the sci- entific community guidance on best practices for data analysis, interpretation, and application. This overview consists of the retrieval algorithms, OCO-2 specific bias correction, retrieval uncertainty evaluation, cross-mis- sion comparison with other existing SIF products, and a global-scale examination of the SIF-GPP relationship. With the initial three years of data (September 2014 onward), we compared OCO-2 SIF with retrievals from Greenhouse Gases Observing Satellite (GOSAT) and Global Ozone Monitoring Experiment-2 (GOME-2), and examined its relationship with FLUXCOM and MODIS GPP datasets. Our results show that OCO-2 SIF, along with GOSAT products, closely resemble the mean spatial and temporal patterns of FLUXCOM GPP from regions to the globe. Compared with GOME-2, however, OCO-2 depicts a more realistic spatial contrast between the tropics and extra-tropics. The linear relationship between OCO-2 SIF and existing modeled GPP products diverges somewhat across biomes at the global scale, consistent with previous GOSAT or GOME-2 based findings when modeled GPP products were used, but in contrast to a consistent cross-biome SIF-GPP relationship obtained at flux tower sites with OCO-2 products. This contrast suggests a critical need to reconcile di fferences in diverse SIF and GPP products and the relationships among them. Overall, the OCO-2 SIF products are robust and valuable for monitoring the global terrestrial carbon cycle and for constraining the carbon source/sink strengths of the Earth system. Finally, insights are offered for future satellite missions optimized for SIF retrievals.

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 Dates: 2018-02-122018-02-272018
 Publication Status: Published in print
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 Identifiers: Other: BGC2852
DOI: 10.1016/j.rse.2018.02.016
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Title: Remote Sensing of Environment
Source Genre: Journal
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Publ. Info: New York : Elsevier
Pages: - Volume / Issue: 209 Sequence Number: - Start / End Page: 808 - 823 Identifier: ISSN: 0034-4257
CoNE: /journals/resource/954925437513