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We found an error with the 2016 and 2017 0.25 degree CO2 files downloaded from NASA, which was determined to be due to missing radiance files in the production of CO2 files on the NASA systems. This was corrected in March, 2025. The error did not exist in 0.1 degree files.

Figure 1: Time series of yearly monthly global Tg CO2 from different versions of QFED.


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Figure 2: Time series of daily global Tg CO2 from different versions of QFED - showing the two spuriously high days in the beginning of the record.


QFED2.6 is consistent with QFED2.5 and may be used going forward.

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