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  • Presentation | A42D: Remote Sensing of CH4 and CO2 from Space: The Expanding Observing System I Oral
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  • A42D-04: First near-real-time estimates of whole-atmosphere greenhouse gases based on OCO-2 and TROPOMI data
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  • Location Icon267-268
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Author(s):
Brad Weir, NASA Goddard Space Flight Center (First Author, Presenting Author)
Alex Webb, NASA Goddard Space Flight Center
Emily Bell, Science Systems and Applications, Inc.
Hannah Zafar, Science Systems and Applications, Inc.
Sourish Basu, NASA Goddard Space Flight Center
Lesley Ott, NASA Goddard Space Flight Center
Vivienne Payne, NASA Jet Propulsion Laboratory, California Institute of Technology
Abhishek Chatterjee, California Institute of Technology
Christopher O'Dell, Colorado State University
Xin Lan, NOAA
John Miller, NOAA
John Mund, Cooperative Institute for Research in Environmental Sciences
Gabrielle Petron, University of Colorado, Boulder
Michael Buchwitz, University of Bremen
Stefan Noel, University of Bremen


Over the past year, NASA has been producing near-real-time (latency of about 7 days) estimates of atmospheric carbon dioxide, methane, and carbon monoxide. These estimates are made by assimilating satellite data into a computer model of the Earth's atmosphere and its interaction with the surface. We assess the accuracy of these estimates by comparing to other datasets, notably surface measurements. This work enables the detection of unusual changes caused by major climate events like the 2023-2025 El Nino. This presentation will show the first estimates of whole-atmosphere growth of carbon dioxide, methane, and carbon monoxide in 2025.



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