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Global Retrievals of Solar-Induced Chlorophyll Fluorescence at Red Wavelengths With TROPOMI

Köhler, Philipp and Behrenfeld, Michael J. and Landgraf, Jochen and Joiner, Joanna and Magney, Troy S. and Frankenberg, Christian (2020) Global Retrievals of Solar-Induced Chlorophyll Fluorescence at Red Wavelengths With TROPOMI. Geophysical Research Letters, 47 (15). Art. No. e2020GL087541. ISSN 0094-8276. https://resolver.caltech.edu/CaltechAUTHORS:20200819-121102689

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Abstract

Observations of solar‐induced chlorophyll a fluorescence (SIF) from spaceborne spectrometers can advance our understanding of terrestrial and aquatic carbon cycles. Here we present the first global retrievals of SIF at red wavelengths from the TROPOspheric Monitoring Instrument (TROPOMI). Despite the weak signal level, considerable uncertainties, and subtle measurement artifacts, spatial patterns and magnitudes agree with independent data sets. Over land, spatial patterns of our red SIF estimates covary with the far‐red SIF data. Red SIF over the ocean is highly consistent with the normalized fluorescence line height (nFLH) inferred from measurements of the MODerate resolution Imaging Spectroradiometer (MODIS), even when comparing single days and fine spatial scales. Major advantages of our Fraunhofer line‐based SIF retrievals include the capability to sense SIF through optically thin cloud/aerosol layers and an insensitivity to ocean color. This opens up new avenues for studying ocean biogeochemistry from space.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1029/2020gl087541DOIArticle
ftp://fluo.gps.caltech.edu/data/tropomiRelated ItemTROPOMI SIF data
ORCID:
AuthorORCID
Köhler, Philipp0000-0002-7820-1318
Behrenfeld, Michael J.0000-0003-1330-7098
Landgraf, Jochen0000-0002-6069-0598
Joiner, Joanna0000-0003-4278-1020
Magney, Troy S.0000-0002-9033-0024
Frankenberg, Christian0000-0002-0546-5857
Additional Information:© 2020 American Geophysical Union. Issue Online: 31 July 2020; Version of Record online: 31 July 2020; Accepted manuscript online: 17 July 2020; Manuscript accepted: 04 July 2020; Manuscript revised: 29 May 2020; Manuscript received: 19 February 2020. This work was funded by the Earth Science U.S. Participating Investigator (Grant NNX15AH95G). M. J. B. was supported under NASA Grant Number 80NSSC18K0616. Sentinel‐5 Precursor is a European Space Agency (ESA) mission implemented on behalf of the European Commission (EC). The TROPOMI payload is a joint development by ESA and the Netherlands Space Office (NSO). The Sentinel‐5 Precursor ground segment development has been funded by ESA and with national contributions from the Netherlands, Germany, Belgium, and the UK. The TROPOMI SIF data can be accessed online (through ftp://fluo.gps.caltech.edu/data/tropomi/).
Funders:
Funding AgencyGrant Number
NASANNX15AH95G
NASA80NSSC18K0616
Subject Keywords:solar‐induced chlorophyll fluorescence; TROPOMI; MODIS
Issue or Number:15
Record Number:CaltechAUTHORS:20200819-121102689
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200819-121102689
Official Citation:Köhler, P., Behrenfeld, M. J., Landgraf, J., Joiner, J., Magney, T. S., & Frankenberg, C. (2020). Global retrievals of solar‐induced chlorophyll fluorescence at red wavelengths with TROPOMI. Geophysical Research Letters, 47, e2020GL087541. https://doi.org/10.1029/2020GL087541
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105028
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:19 Aug 2020 19:43
Last Modified:19 Aug 2020 19:43

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