Global Parallel Experiment Log
- Experiment Name
Scheduled June 2000 Implementation
- Parallel Slot
- Control Slot
- Start date of parallel experiment
- End date of parallel experiment
- Environmental Modeling Center scientists
- Abstract (including Motivation, Hypothesis and Method)
A number of improvements to the operational global model
are slated for implementation in June 2000.
The motivations for these changes are
- improved tropical storm track forecasts,
- improved ozone analyses and forecasts,
- improved use of rawinsoned data,
- improved use of satellite data,
- improved initial development of tropical depressions,
- improved winter midlatitude general circulation,
- improved representation of orography particularly over Antarctica,
- improved model forecast efficiency, and
- improved summertime forecast bias near the continental surface.
OBSERVATIONAL AND ANALYSIS CHANGES
A new program to relocate tropical storms in the guess fields before analysis
will be ready for the next hurricane season.
The complex quality control provides a new observation error diagnosis
using a combination of Bayesian logic, modeled error structure and
fuzzy logic to make decisions.
The rawinsonde radiation correction has been upgraded, too.
The impacts of rawinsonde balloon drift in both space and time are included.
GOES-10 radiance data is now used.
A new ozone analysis background error is applied
to avoid spurious far-field effects in data sparse regions.
Satellite bias correction, quality control and data selection algorithms
FORECAST AND POST PROCESSING CHANGES
The deep convection algorithm is modified so instead of parameterizing the
deepest possible cloud, the cloud top is chosen randomly among allowed clouds.
This change reduces spurious tropical bombs
and improves tropical storm forecasts.
The gravity wave drag is corrected allowing more drag in the upper atmosphere.
The terrain fields are recomputed from new orography datasets.
The orography is filtered in the highest wavenumbers to reduce "ringing".
A reduced grid over polar regions is used in the MRF to gain efficiency.
A reversible interpolation is used to keep the surface file
on a full grid for compatibility.
New albedo climatology is used and
aerosols over land are used in the shortwave radiation to reduce the
summertime continental near surface warm bias.
- Experiment changes log
- Implementation changes list
- Product changes list
- Background links
Summer 1999 storm relocation and deep convection experiments by Hua-Lu Pan
April 1999 ozone analysis diagnostics by Wan-Shu Wu and Mark Iredell
Complex quality control draft office note by Bill Collins
- Evaluation of parallel results
Daily forecast maps by Pete Caplan
Verification of precipitation by Hua-Lu Pan
Verification against rawinsondes timeseries by Suru Saha
Verification against rawinsondes horizontal maps by Suru Saha
Verification against rawinsondes vertical maps by Suru Saha
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Page Last Modified: June 1, 2000