Weekly Report
on
GOES-14 PLT
Science Test
NOAA / NESDIS / STAR
X. Wu, G. Rancic, F. Yu
December 18, 2009
1
1. Initial Results of GEO-GEO
Comparison for GOES-14 PLT
Purpose:
 Confirm that GOES-14 measurements are comparable with those currently
operational (GOES-11/12) to ensure operation continuity.
Method:
 Collect the collocated data by both GEOs along a narrow strip (~40 km)
in the middle of the two to minimize difference due to viewing geometry.
Data:
 Along 120W for GOES-11/14, 90W for GOES-12/14, 0-50N, every 30
minutes, 2009/12/01 to 2010/01/05.
Analysis:
 This analysis presents comparison of two channels for GOES-12/14 on
Dec 16, when GOES-14 emulated GOES-12.
2
GOES14 – GOES12 Imager Visible Channel
3
GOES14 – GOES12 Imager 3.9 m Channel
4
Preliminary Results





All channels of GOES-14 Imager are comparable
with the counterparts of GOES-11/12.
Most of the observed differences are likely due to
residual BRDF effects.
Further QC is needed for comparison.
No instrument issue has been identified.
More results, including Sounder, will follow.
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2. Initial Bias Evaluation of
GOES-14 IR Channels

Purpose:



Methods:


Verify GOES-14 Imager and Sounder
IR channel calibration.
Establish benchmark for future intercalibration.
GSICS GEO-LEO Inter-Calibration
(Wu et al 2009).
GOES-14 Imager spectral response functions and the
simulated AIRS/IASI spectra
Data


GOES Imager IR data, AIRS/IASI
data since Oct. 28, 2009
GOES Sounder and IASI data
between Nov. 30, 2009-Dec. 13, 2009
GOES-14 Imager (upper) and Sounder
(lower) spectral response functions and
the simulated AIRS/IASI spectra
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2.1 GOES-14 Imager vs AIRS/IASI
-1.28 K
-1.15 K
+0.96 K
+0.95 K
+1.01 K
-0.06 K
+0.17 K
+0.16 K
-0.08 K
-0.54 K
-0.51 K
-0.03 K
• More at http://www.star.nesdis.noaa.gov/smcd/spb/fwu/homepage/GSICS_GOES14_AIRS_IASI.php
• Large difference for 3.8 m channel may be due to the BRDF of solar reflection
• Large bias (1 K) for water vapor channel
• Unusually large and unstable bias for Ch. 10.7 m in November
• Smaller bias (-0.5K) for 13.3 m channel
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2.2 GOES-14 Sounder vs IASI
Ch. #
*: IASI does not
cover this
channel fully
Channel
GOES – IASI
(homo. Scene # <84)
RGEO  a  b * RIASI
a
b
Tb (K)
stdv (K)
1
14.71µm
1.240(±0.777)
0.976(±0.019)
0.263
0.177
2
14.37µm
1.244(±0.412)
0.972(±0.010)
0.159
0.236
3
14.06µm
-0.249(±0.300)
1.001(±0.006)
0.178
0.425
4
13.64µm
0.230(±0.258)
0.998(±0.004)
0.307
0.652
5
13.37µm
0.206(±0.305)
0.996(±0.005)
0.211
0.853
6
12.66µm
0.345(±0.301)
0.993(±0.004)
0.187
1.310
7
12.02µm
0.3459±0.287)
0.991(±0.004)
0.00
1.138
8
11.03µm
0.269(±0.243)
0.993(±0.004)
-0.048
0.935
9
9.71µm
0.108(±0.099)
0.998(±0.004)
0.162
0.613
10
7.43µm
0.005(±0.05)
0.999(±0.004)
-0.047
0.448
11
7.02µm
0.031(±0.038)
0.992(±0.005)
-0.185
0.389
12
6.51µm
0.036(±0.024)
0.980(±0.008)
-0.144
0.348
13
4.57µm
0.0002(±0.001)
1.012(±0.004)
0.214
0.364
14
4.52µm
-0.0009(±0.001)
0.9997(±0.004)
-0.031
0.287
15
4.45µm
-0.0007(±0.001)
1.027(±0.007)
0.214
0.364
16
4.13µm
-0.002(±0.006)
1.004(±0.004)
-0.031
0.287
17
3.98µm
-0.0039(±0.0005)
1.013(±0.004)
-0.223
0.549
18*
3.74µm
-0.011(±0.001)
12.01
0.837
1.949(±0.008)
Much less bias
for SW channels
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3. Initial Noise Evaluation of
GOES-14 IR Channels

Purpose:



Methods:



Standard deviation of space looks.
Standard deviation of blackbody looks will follow.
Data


Confirm compliance of instrument spec.
Establish benchmark for future Instrument Performance Monitoring.
11/30 – 12/14
Analysis:


Mean noises are presented. Agree with CIMSS results.
Detailed analysis will follow.
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Preliminary Results
Initial Evaluation of GOES-14 Bias
160
140
120
NEdT (mK)
100
80
60
40
20
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
Channel (Sounder & Imager+20)
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4. GOES-14 Instrument
Performance Monitoring

Purpose:




Plot telemetry data at various time scales
Data


SPLK for GOES-14 Imager visible channel
Methods:


Detect/Confirm instrument performance
anomaly.
Diagnose for root cause
Verify efficacy of resolution
GVAR Block 11.
Analysis:


Zero space count for Imager visible channel noon
to midnight – space look side?
More at
http://www.star.nesdis.noaa.gov/smcd/spb/fwu
/homepage/GOES14_Imager_IPM.php
11