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Proceedings Paper

Orbiting Carbon Observatory-3 (OCO-3), remote sensing from the International Space Station (ISS)
Author(s): Ralph R. Basilio; Matthew W. Bennett; Annmarie Eldering; Peter R. Lawson; Robert A. Rosenberg
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Paper Abstract

The Orbiting Carbon Observatory-3 (OCO-3) was launched on 04 May 2019 and provides a new perspective to the important task of studying atmospheric carbon dioxide (CO2) as well as solar-induced chlorophyll fluorescence (SIF), a bonus product, from space. The flight spare three-channel grating spectrometer instrument built for OCO-2 has been adapted for use on the International Space Station (ISS) as OCO-3 by modifying the entrance optics, using a new calibrator assembly, incorporating a two-axis pointing mirror assembly (PMA), and adding two context cameras. The ISS’ recessing orbit allows measurements to be collected from dawn to dusk in the equatorial to northern & southern mid-latitude regions and the PMA enables a new snapshot area mapping mode where ~80 km x ~80 km areas can be examined in more detail. The OCO-3 payload underwent an extensive ground test and calibration program in a 3 m diameter thermal vacuum chamber. The chamber has a port/window that allowed optical ground support equipment, including a heliostat, to illuminate the instrument under operating environmental conditions. The payload’s performance in space during the in-orbit checkout (IOC) period compares favorably with ground test results. Initial and not-yet-fully-calibrated retrieved estimates of the column-averaged dry air mole fraction of CO2 (XCO2) are reasonable when compared to ground-based measurements. SIF estimates show clear contrast between areas of high and low vegetation. There is high confidence that the three-year prime mission will deliver the data needed for science/research, data applications, and informed decision-making.

Paper Details

Date Published: 10 October 2019
PDF: 14 pages
Proc. SPIE 11151, Sensors, Systems, and Next-Generation Satellites XXIII, 1115109 (10 October 2019); doi: 10.1117/12.2534996
Show Author Affiliations
Ralph R. Basilio, Jet Propulsion Lab. (United States)
Matthew W. Bennett, Jet Propulsion Lab. (United States)
Annmarie Eldering, Jet Propulsion Lab. (United States)
Peter R. Lawson, Jet Propulsion Lab. (United States)
Robert A. Rosenberg, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 11151:
Sensors, Systems, and Next-Generation Satellites XXIII
Steven P. Neeck; Philippe Martimort; Toshiyoshi Kimura, Editor(s)

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