Harmonizing the ACOS GOSAT v9 and OCO-2 v10 XCO2 products

Tommy Taylor,  CSU/CIRA,  tommy.taylor@colostate.edu (Presenter)
Chris O'Dell,  CSU/CIRA,  christopher.odell@colostate.edu
Sean Crowell,  OU,  scrowell@ou.edu

In an era of multiple satellite platforms acquiring space-based measurements of the total column of carbon dioxide (XCO2), the ability to harmonize products from different sensors and/or algorithms is crucial. The harmonization of products allows not only direct comparison and usage for overlapping time periods, but allows for data records to be extended both spatially and temporally as sensors with varying orbit and viewing parameters come in and out of service.

This work explores the potential of harmonizing XCO2 estimates from the Japanese Greenhouse Gases Observing Satellite (GOSAT) and NASA’s Orbiting Carbon Observatory-2 (OCO-2), both derived from the Atmospheric Carbon Observations from Space (ACOS) full physics retrieval algorithm. The latest ACOS GOSAT and OCO-2 XCO2 products used slightly different versions of the ACOS algorithm, version 9 (v9) for GOSAT and v10 for OCO-2, and span different time ranges, March 2009 – June 2020 for GOSAT v9 and August 2014 through the present for OCO-2 v10. We present the differences in the two XCO2 products, hypothesize on the source of the differences, and then explore methods for mitigating differences to create a harmonized set of measurements that can be freely assimilated in carbon inversion models without additional corrections.

Poster: Poster_Taylor__139_25.pdf 

Presentation Type: Poster

Session: 1.5b Results from current missions

Session Date: Monday (6/14) 12:00 PM