Summary for 15 October – 29 December 2006
Reporting time (for this report): 29 December 2006
Shuiyong re-calculated the BE for 27 and 9km domains using the accumulated pre-operational forecast samples in a period of the August 2006 with the setup of WRFSI+wrfvar (BE interpolation) +WRF(v2.1). Both of the single observation and AWS+GPS experiments were performed. But the humidity assimilation needs further work.
This task is
finished. Please refer to MinÕs summary.
The comparison
between the pre-operational WRF system and the operational MM5 system for the
forecasts for June, July and August, 2006 has been conducted by Jiqin. ItÕs
found that MM5 outperforms WRF for surface wind and temperature, WRF
outperforms MM5 for surface humidity, and both have similar forecast performances
for upperair variables.
This task needs
continuous work and regular report will be submitted in the next year.
This task is finished.
BMB real-time GTS
data collecting system is still under construction. The main problem is that weÕre
in lack of robust decoder software. This task is still ongoing.
A pre-operational
WRF-based cycling system is ready.
WRFVAR analysis and forecasts are cycled on both 27km and 9km domains
with 6-hour interval. The cycles restart at 1200UTC per day. 48-hour forecasts are performed at 00
and 12 UTC, while just 6-hour forecasts are performed at 06 and 18UTC. The
lateral boundary conditions are provided by GFS forecasts.
A testing period
from 12UTC 25 July to 00UTC 01 August is chosen for performances comparison
between the WRF-based cycle and MM5 operational runs. A detailed report about
the comparison will be submitted next time.
WPS v204 + WRF
v2048 has been updated to WPS v209 + WRF v2056 with WeiÕs help. Shuiyong
conducted a series of experiments to test the sensitivity to different schemes:
vertical levels; surface physics; landuse table; shortwave radiation scheme. ItÕs
revealed that new version reduces cold bias and improves precipitation forecast.
This task is
finished.
Next
report time: 14 January, 2007!!