Oreste Reale (PI)
University of Maryland Baltimore County
oreale@gmao.gsfc.nasa.gov
Observing System Experiments (OSE and OSSE) to Evaluate and Enhance
the Impact of Current and Future Satellite Observations
A three-year research effort is proposed to continue to conduct (a)
Observing System Simulation Experiments (OSSE's) for advanced atmospheric
observing systems under consideration by NASA, and (b) Observing System
Experiments (OSE's) for currently available satellite data. The objective
of the OSSE's is to provide a quantitative assessment of the potential
impact of proposed space-based observing systems on atmospheric modeling,
data assimilation, and climate system studies. In these investigations,
we avoid the problems associated with early simulation studies of the
''identical twin'' type by using different models to simulate the ''true''
state of atmosphere (or nature) and in the analysis/forecast system to
assimilate simulated conventional and satellite-derived data, and produce
forecasts. The operational observing network of stations are simulated
according to their actual distributions and error characteristics and
data from the proposed instruments are simulated with planned coverage,
resolution, sampling errors, and noise levels. The simulation system
is calibrated by careful comparisons with real data assimilation/forecast
impact studies made with and without currently available satellite observations.
Impact studies are run for simulated advanced passive sounders, as well
as for data from active remote sensing systems. In addition, advanced
techniques for asynoptic data assimilation and different configurations
of conventional observations and advanced sounding systems will be assessed.
The objective of the OSE's or ''real data impact studies'' that are performed
under this proposal is to evaluate the impact of currently available
satellite data sets. Results from these experiments are used to improve
the utilization of satellite observations in data assimilation, as well
as for the validation of the OSSE's.
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