Summary of full OSSEs at NCEP and Emerging Internationally Collaborative
Joint OSSEs
Joint
OSSE team
Speakers:
Michiko Masutani(EMC), Erik Andersson (ECMWF),
Oreste Reale(NASA/GLA) Jack Woollen (EMC)
Dave Emmitt(SWA) Lars Peter Riishojgaard (JCSDA,NASA/GMAO)
Abstract:
Observing system impact
assessments using atmospheric simulation experiments are conducted to provide
an objective quantitative evaluation of future observing systems and
instruments. Such simulation experiments
using a proxy true atmosphere which is called Nature Run (NR),
are known as Observing System Simulation Experiments (OSSEs).
NCEP has been working on OSSE for last
several years using a NR with triangular truncation 213 (T213). Since a Doppler Wind Lidar (DWL) is a most
costly instrument, its evaluation has been a main focus in NCEP OSSEs. In the first part of this seminar, a summary
from OSSEs at NCEP that evaluated the data impact of DWL are presented. The results show a potentially powerful
impact from DWL, but also show that without a careful design of the observing
system and a significant effort in developing the data assimilation system, DWL
will not be utilized to its best potential.
Through the NCEP OSSE, it has been recognized that OSSEs are very labor
intensive projects. It has been realized that the preparation of a Nature Run,
including its evaluation, the simulation of observations from it, and its
distribution consume a significant of amount of resources.
Scientists from NCEP, NASA/GSFC, NESDIS, ESRL, and ECMWF discussed the
design of common NRs and the first three Joint OSSE NRs have been produced by the
Now the
collaboration and interest have been expanded to include KNMI, JMA, Mississippi
State University, NRL-Monterey, NCAR and others. We decided to call this effort the Joint
OSSEs. In Joint OSSEs common NRs will be used by the various DAS at many
institutes. By using the same NR, simulated observations can be
shared and the results can be compared.
Extended international collaboration within the meteorological community
is essential for timely and reliable OSSEs.
The second part of this seminar, Evaluation
of Joint OSSE NRs and progress and plans for Joint
OSSEs are presented.