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. |