GSI/WRF Regional Data Assimilation System and Its Application in theWeather Forecasts over Southwest Asia - Data Assimilation for Atmospheric, Oceanic and Hydrologic Applications - page 620

AMSUA-15
OBS=36473, USED=14945, Precentage=41%

OBS

60000

USED

40000

20000

0

1 3 5 7 9 1 3 5 7 9 1 3 5 7 9

AMSUA-16
OBS=54669, USED=26097, Precentage=48%

OBS
USED

80000

60000

40000

20000

0

1 3 5 7 9 11 13 15 17 19 21 23 25 27 29

AMSUB-15
OBS=107459, USED=16547, Percentage=16%

OBS
USED

200000

150000

100000

50000

0

13579 1 3 5 7 9 1 3 5 7 9

AMSUB-16
OBS=163968, USED=26216, Precentage=16%

OBS
USED 200000

150000

100000

50000

0

1 3 5 7 9 1 3 5 7 9 1 3 5 7 9

Date

Fig. 25.13 Total number of radiance and used percentage in the forecast experiments as a function
of date for AMSU-A and AMSU-B in NOAA 15 and NOAA 16, respectively (Updated from Xu
et al. ( 2009 ))

ARW WRF forecast model to modify the initial condition at 00Z on each day, and
then integrated using the same forecast lengths as in the CTRL experiment.

25.6.2 Results

To understand clearly the effect of ATOVS radiance data assimilation on the
forecasts over Southwest Asia, three statistical parameters - bias, correlation, and
mean square error skill scores - are calculated against the observation data.