7A.6    Assimilating compact phase space retrievals (CPSRs) with WRF-Chem/DART: extension to rectangular systems and comparison with independent observations

 

Mizzi, Arthur P., David P. Edwards, National Center for Atmospheric Research (NCAR)/Atmospheric Chemistry Observations and Modeling Laboratory, and Jeffrey L. Anderson, NCAR/Institute for Mathematics Applied to Geosciences

 

Compact phase space retrievals (CPSRs) make assimilation of trace gas retrieval profiles computational efficient and positively impact analysis fit and forecast skill.  The CPSR algorithm was developed for assimilation of all retrievals is a trace gas retrieval profile (called square systems due to the form of the retrieval forward operator),  Often it is necessary for quality assurance reasons to discard/not assimilate all retrievals from one or more levels in the profile (resulting in assimilation of truncated retrieval profiles).  This presentation extends the CPSR algorithm to assimilation of truncated retrieval profiles (called rectangular systems) and compares the results with independent observations.  The results are somewhat unexpected due to the impact of discarding retrievals from selected levels on the retrieval forward operator.