The 23th BMB-NCAR Project Meeting

Time: 02:00~03:00 pm, Apr 25, 2006

Participants: Dr. Huang, Dr. Guo, Dir Kuo, Dr. Braun and Jiqin Zhong

1. Discuss the project progress

Dir. Guo invited John Braun to explain the observation errors in the GPS data file. The errors are not instrument errors, but formal errors derived during the data processing. Using a constraint, which is switched off in the current BMB configuration, can reduce them. Drs. Huang and Guo suggested using the default error for GPS in the OBS_PROC in our GPSPW assimilation experiments. However, a re-processed data would be preferred.

Jiqin ran GPSPW data assimilation experiments and verified the results against observations. The scores based on AWS observations showed positive impact on pressure and humidity, while neutral impact on wind and temperature. Drs Huang and Guo suggested Jiqin make verification based on GPS observations as well. Jiqin also should make the precipitation verification package work as soon as possible.

Dir. Kuo suggested Jiqin make sure whether the data used in the GPSPW assimilation experiments were post-processed or real-time processed. If it was post-processed, Jiqin should get the real-time data and run another experiment to assess the impact.

2. Make a task list

• Make verification based on GPSPW observation
• Make the precipitation verification package work.
• Make real-time processed GPSPW data assimilation experiment.

3. Next meeting

 The next meeting will be at 2:00 pm, May 10, 2006.