In the Round Robin Data Package, has the AATSR 12 μm calibration issue been addressed?
The AATSR nadir and forward 12 µm BTs in the RRDP have been adjusted by +0.2 K, which is an interim measure to reduce this problem and make the channels more consistent with previous ATSRs. This measure is thought to reduce the magnitude of the remaining calibration uncertainty to O(0.1 K). If a more precise adjustment is required, results from the ARC project suggest that an additional adjustment as a function of the total column water vapour in the observed scene is useful. Details can be provided on request.