The Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI) has released it's CryoSat-2 Sea Ice Thickness data for October 2016 to January 2017, so it is now possible to do a proper comparison with the Pan-Arctic Ice Ocean Modeling and Assimilation System (PIOMAS) and CryoSat-2 reported sea ice thickness.
The Centre for Polar Observation and Modelling (CPOM) also produce sea ice thickness data derived from CryoSat-2 and their NRT 2 day 1km product is used here to create a monthly average.
In order to properly compare PIOMAS with CryoSat-2, each valid data point in the CPOM dataset is mapped onto the PIOMAS grid, and the corresponding value from the PIOMAS daily gridded dataset is used to create a monthly average. The intention being to sample the PIOMAS grid at the same temporal and spatial frequency as the CryoSat-2 satellite samples the Arctic sea ice and create a CryoSat-2 equivalent monthly average from the PIOMAS data.
The PIOMAS and CPOM data are regridded onto the NSIDC EASE-2 25 km grid, as used by for the AWI sea ice thickness product. The AWI colour bar is used for all three sea ice thickness products.
In the process of generating the monthly averages the opportunity is taken to create a monthly average difference between PIOMAS and CPOM sea ice thickness. To create this monthly average each valid CPOM data point that lies in an ocean grid cell on the PIOMAS gird is subtracted from the corresponding PIOMAS data point
In comparing PIOMAS with CryoSat-2 derived Sea Ice Thickness it is worth noting that PIOMAS reports Effective Sea Ice Thickness, while the CryoSat-2 derived products report Average Sea Ice Thickness. To complicate matters even further, the PIOMAS monthly average presented here is in fact Average Effective Sea Ice Thickness.
The CryoSat-2 satellite does not provided complete coverage of the Arctic in a one month period, and so there are blank areas where no data is avalaible.
Comparison of PIOMAS vS. CryoSat-2 for October 2016