CO2 soundings from the new algorithm version 2.8, that pass the new quality criteria, for the months of August-October, 2010, aggregated to a 2x2 deg grid.
Building upon improvements to their Carbon Dioxide retrieval, the Atmospheric CO2 Observations from Space (ACOS) Team has started delivering data from the new, Version 2.8, algorithm. These data are Level 2, and can be found and acquired from the Goddard Earth Sciences Data and Information Services Center (GES DISC) as data Collection Version 002.
This data is the second release of total column carbon dioxide (XCO2) data calculated from radiance measurements taken by the TANSO-FTS instrument on the Japanese GOSAT satellite. The XCO2 retrievals were performed as part of the Atmospheric CO2 Observations from Space (ACOS) project at JPL and are available for preliminary utilization by the broader community. Data spanning the entire mission, beginning April 2009 to the present, are available. This second version of the data includes ocean glint scenes, which continue to be evaluated and should be considered a “preliminary” product. Version 2.8 also contains a master quality flag that provides the data user with information on the quality of each sounding. In general, the ACOS XCO2 data are biased low by about 7-8 ppm compared to ground based measurements. This is a slight improvement compared to the previous ACOS data release. Improvements to the ACOS data product continue and validation analysis for v2.8 is ongoing. The priority of future releases of ACOS data will be to reduce the biases and other error terms in the XCO2 product.