EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

OCO-3 Snapshot Area Mapping Mode: Early Results

Robert Roland Nelson1, Annmarie Eldering1, Thomas Kurosu1, Matthäus Kiel1, Brendan Fisher1, Ryan Pavlick1, Gary Spiers1, Rob Rosenberg1, David Crisp1, Christopher O'Dell2, Peter Somkuti2, Thomas Taylor2, Eric Kort3, Tomohiro Oda4,5, Ray Nassar6, and Thomas Lauvaux7
Robert Roland Nelson et al.
  • 1Jet Propulsion Laboratory, Pasadena, United States of America (
  • 2Colorado State University, Fort Collins, United States of America
  • 3University of Michigan, Ann Arbor, United States of America
  • 4Goddard Earth Sciences Technology and Research, Universities Space Research Association, Columbia, United States of America
  • 5Global Modeling and Assimilation Office, NASA Goddard Space Flight Center, Greenbelt, MD, United States of America
  • 6Environment and Climate Change Canada, Toronto, Canada
  • 7Le Laboratoire des Sciences du Climat et de l'Environnement, Saint-Aubin, France

The NASA Orbiting Carbon Observatory-3 (OCO-3) was launched on May 4, 2019 to the International Space Station and has been taking measurements since August. OCO-3, like its predecessor OCO-2, makes hyperspectral measurements of reflected sunlight in three near-infrared bands. However, one of the unique features of OCO-3 is its ability to scan large contiguous areas on the order of 80 km by 80 km using a pointing mirror assembly. This capability, known as snapshot area mapping (SAM) mode, is being used to look at cities, forests, volcanos, and multiple other areas that are of interest to the carbon dioxide (CO2) and solar-induced chlorophyll fluorescence (SIF) scientific communities. For example, OCO-3 can measure column-mean CO2 (XCO2) over the entire Los Angeles, CA basin during the span of only two minutes. With several hundred SAMs having been collected so far and upwards of 25 possible per day, there is a wealth of data to investigate for scientific features and for any potential instrument biases. Additionally, this type of dense sampling will be a proof-of-concept for multiple future wide-swath CO2 missions. Here, we present several OCO-3 SAM mode measurements and discuss interesting features, XCO2 results, and future mission plans.

How to cite: Nelson, R. R., Eldering, A., Kurosu, T., Kiel, M., Fisher, B., Pavlick, R., Spiers, G., Rosenberg, R., Crisp, D., O'Dell, C., Somkuti, P., Taylor, T., Kort, E., Oda, T., Nassar, R., and Lauvaux, T.: OCO-3 Snapshot Area Mapping Mode: Early Results, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-10116,, 2020

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Presentation version 2 – uploaded on 06 May 2020 , no comments
Updated the link to the new OCO-3 SAM website.
Presentation version 1 – uploaded on 05 May 2020 , no comments