When comparing the IASI CH4 product with a high resolution profile (aircraft profiles, model data..), the sensitivity of the (low resolution) IASI CH4 profiles needs to be taken into account.
This can be done by smoothing the high resolution profile with the IASI CH4 averaging kernel :
: the smoothed (aircraft or model) profile
: the IASI CH4 a priori profile
: the IASI CH4 averaging kernel
: the high resolution (aircraft or model) profile
Note, the averaging kernel is given in vmr/vmr units.
Note: this dataset is generated as part of the ESA GHG-CCI project and is still under validation.
The retrievals are performed between 60°S and 70°N.