Evaluating the consistency between OCO-2 and OCO-3 XCO <sub>2</sub> estimates derived from the NASA ACOS version 10 retrieval algorithm
Thomas E. Taylor, C. O’Dell, David A. Baker, Carol J. Bruegge, Albert Y. Chang, Lars Chapsky +4 more
Atmospheric measurement techniques
Abstract
Abstract. The version 10 (v10) Atmospheric Carbon Observations from Space (ACOS) Level 2 full-physics (L2FP) retrieval algorithm has been applied to multiyear records of observations from NASA's Orbiting Carbon Observatory 2 and 3 sensors (OCO-2 and OCO-3, respectively) to provide estimates of the carbon dioxide (CO2) column-averaged dry-air mole fraction (XCO2). In this study, a number of improvements to the ACOS v10 L2FP algorithm are described. The post-processing quality filtering and bias correction of the XCO2 estimates against multiple truth proxies are also discussed. The OCO v10 data volumes and XCO2 estimates from the two sensors for the time period of August 2019 through February 2022 are compared, highlighting differences in spatiotemporal sampling but demonstrating broad agree