It is foreseen that ground based GPS observations due to their high time resolution will have the highest impact when assimilated using 4DVar assimilation systems. At both DMI and the Met Office, a 3DVar assimilation system is currently in operational use and 4DVar versions are under development.
operators enabling assimilation of ground based GPS observations in
be tested. Secondly a number of case studies shall be performed, in
GPS data is compared to simulations based on 3DVar analyses.
The 4DVar data assimilation
simulations and results performed by DMI are reported in in the
Notice that the same deliverables contains the DMI reporting on their experiment in workpackage 3000 on correcting in 4DVar for the
temporal error correlations of GPS ZTDs.