Global Retrievals of Solar-Induced Chlorophyll Fluorescence With TROPOMI: First Results and Intersensor Comparison to OCO-2
Abstract
In recent years, solar‐induced chlorophyll fluorescence (SIF) retrieved from spaceborne spectrometers has been extensively used as a proxy for terrestrial photosynthesis at relatively sparse temporal and spatial scales. The near‐infrared band of the recently launched TROPOspheric Monitoring Instrument (TROPOMI) features the required spectral resolution and signal‐to‐noise ratio to retrieve SIF in a spectral range devoid of atmospheric absorption features. We find that initial TROPOMI spectra meet high expectations for a substantially improved spatiotemporal resolution (up to 7‐km × 3.5‐km pixels with daily revisit), representing a step change in SIF remote sensing capabilities. However, interpretation requires caution, as the broad range of viewing‐illumination geometries covered by TROPOMI's 2,600‐km‐wide swath needs to be taken into account. A first intersensor comparison with OCO‐2 (Orbiting Carbon Observatory‐2) SIF shows excellent agreement, underscoring the high quality of TROPOMI's SIF retrievals and the notable radiometric performance of the instrument.
Additional Information
© 2018 American Geophysical Union. Received 31 MAY 2018; Accepted 27 SEP 2018; Accepted article online 2 OCT 2018; Published online 12 OCT 2018. This work was funded by the EARTH SCIENCE U.S. PARTICIPATING INVESTIGATOR (Grant: NNX15AH95G). 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 UK. The OCO‐2 SIF data were produced by the OCO‐2 project at the Jet Propulsion Laboratory, California Institute of Technology, and obtained from the OCO‐2 data archive maintained at the NASA Goddard Earth Science Data and Information Services Center. The TROPOMI SIF data can be accessed through ftp://fluo.gps.caltech.edu/data/tropomi/.Attached Files
Published - K-hler_et_al-2018-Geophysical_Research_Letters.pdf
Supplemental Material - grl58102-sup-0001-supplementary.pdf
Supplemental Material - grl58102-sup-0002-supplementary.gif
Files
Additional details
- Eprint ID
- 90629
- Resolver ID
- CaltechAUTHORS:20181105-085712970
- NNX15AH95G
- NASA
- Created
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2018-11-06Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field
- Caltech groups
- Division of Geological and Planetary Sciences