1. Progress Report I: Simulation of GOES Radiances for OSSE
Tong Zhu1, F. Weng1, J. Woollen2, M. Masutani2,
S. Lord2, Y. Song2, Q. Liu1, S. A. Boukabara1
Ronald Errico3
1. NOAA/NESDIS/STAR, Camp Springs, MD
2. NOAA/NWS/NCEP/EMC, Camp Springs, MD
3. NASA/GSFC/GMAO, Greenbelt,MD

2. Objective
GOES data is simulated to test impact of GOES in simulation experiments in comparison with impact of real data.
OSSE for GOES will serve as a calibration for GOESR OSSE.

3. Procedures
NCEP and NESDIS are working to set up the scripts to produce radiance data while GMAO is developing a sampling method, cloud clearing algorithm, and error assignment for simulated radiance data.
In this work data for cloudy areas will be simulated and TCC values (or other values) to help with cloud masking will be attached for use in quality control. A pre-processor will be written to discard radiances for cloudy conditions.
This work also include estimation of resources required.
When GMAO is ready with the cloud clearing algorithm, that will be included as a pre-processor.

4. DB91L Input data set for CRTM to simulate radiance data.
The data set contains 91 level nature run variables horizontally interpolated to an observation point without vertical interpolation. Selected model level data and all surface data are included.
Climatological data (such as vegetation surface type) are processed separately.
The orbital pattern data are extracted from BUFR dump files.
DB91L includes all necessary information need to simulate radiance from NR and BUFR dump files.
DB91L can be saved either every 6 hours or 6 minutes depending on the amount of data.
DB91L data will be saved in binary format.

5. Central Wavelength (μm)
Current GOES vs. GOES-R
GOES-R ABI vs. Current GOES
Current GOES Imager IR band has 4 km horizontal resolution (FOV), GOES Sounder has 10 km resolution. A full disk scan has total 10,080,910 observation points, and takes about 26 min. GOES-R ABI sensor will has 1km/2 km resolution.
GOES-R ABI Band
Central Wavelength (μm)
Current GOES Band
1 (blue)
1 km
0.47
2 (red)
0.5 km
0.64 1 3
0.86 4
2 km
1.38 5
1.61 6
2.26 7
3.9 2
4 km 8
6.185 9
6.95 10
7.34 11
8.5 12
9.61 13
10.35 14
11.2 15
12.3
5 (G08) 16
13.3
5 (G12)

6. Radiance Simulation Flow Chart
ECMWF T511 NR
GOES-12
Viewing Geometry
Atmospheric profiles
Surface parameters
CRTM
GOES Radiance
Validation

7. GOES EAST Observation Locations
A full disk scan has total 10,080,910 observation points for 4 km resolution
Reduced to ~20 km, points
Reduced to ~60 km, points

8. DBL91 dataset format -by Jack Woollen
lon= lat= dt= ( )
iv=27 ! low vegetation cover
iv=28 ! high vegetation cover
iv=29 ! low vegetation type
iv=30 ! high vegetation type
Sea-ice cover [(0-1)]
Snow albedo [(0-1)]
Forecast albedo [(0 - 1)]
Forecast surface roughness [m]
Forecast log of surface roughness for heat
pres(pa) cloud cov cloud ice cloud h2o ozone mmr tempature spf humid
iv= iv= iv= iv= iv= iv=133
.1000E E E E E E E-06
.2990E E E E E E E-05
.5684E E E E E E E-05
.1015E E E E E E E-05
.1716E E E E E E E-05
.2768E E E E E E E-05
.4285E E E E E E E-05
.6396E E E E E E E-05
60 Variables
91 Levels

9. T511 NR: Hurricane at 1 October 2005

10. NR CRTM GOES Imager
3.9 µm
6.5 µm
13.3 µm
10.7 µm

11. NR CRTM GOES Sounder 14.7 µm 14.4 µm 14.1 µm 13.6 µm 13.4 µm 12.7 µm

12. NR CRTM SEVIRI 0.635 µm 0.81 µm 1.64 µm 3.9 µm 6.25 µm 7.35 µm 8.7 µm

13. Real Observation SEVIRI 12 Bands

14. Summary
This work showed that data are processed reasonably. Decoding, interpolation, and CRTM are working.
Weather patterns in presented figures are produced by water and ice in the cloud. These radiance data are most likely contaminated by cloud and are not assimilated by DAS.
Since GSI simulates radiance as a clear radiance, simulating only clear radiance is considered to be the first step. Various sampling strategies are considered.