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Weekly Report Weekly Report on on

GOES-14 PLT GOES-14 PLT Science TestScience Test

NOAA / NESDIS / STARNOAA / NESDIS / STAR

X. Wu, G. Rancic, F. YuX. Wu, G. Rancic, F. Yu

December 18, 2009December 18, 2009

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1. Initial Results of GEO-GEO 1. Initial Results of GEO-GEO Comparison for GOES-14 PLTComparison for GOES-14 PLT

Purpose:Purpose: Confirm that GOES-14 measurements are comparable Confirm that GOES-14 measurements are comparable

with those currently operational (GOES-11/12) to with those currently operational (GOES-11/12) to ensure operation continuity.ensure operation continuity.

Method:Method: Collect the collocated data by both GEOs along a Collect the collocated data by both GEOs along a

narrow strip (~40 km) in the middle of the two to narrow strip (~40 km) in the middle of the two to minimize difference due to viewing geometry.minimize difference due to viewing geometry.

Data:Data: Along 120W for GOES-11/14, 90W for GOES-12/14, 0-Along 120W for GOES-11/14, 90W for GOES-12/14, 0-

50N, every 30 minutes, 2009/12/01 to 2010/01/05.50N, every 30 minutes, 2009/12/01 to 2010/01/05.

Analysis:Analysis: This analysis presents comparison of two channels for This analysis presents comparison of two channels for

GOES-12/14 on Dec 16, when GOES-14 emulated GOES-GOES-12/14 on Dec 16, when GOES-14 emulated GOES-12.12.

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GOES14 – GOES12 Imager Visible GOES14 – GOES12 Imager Visible ChannelChannel

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GOES14 – GOES12 Imager 3.9 GOES14 – GOES12 Imager 3.9 m m ChannelChannel

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Preliminary ResultsPreliminary Results All channels of GOES-14 Imager are All channels of GOES-14 Imager are

comparable with the counterparts of comparable with the counterparts of GOES-11/12.GOES-11/12.

Most of the observed differences are Most of the observed differences are likely due to residual BRDF effects.likely due to residual BRDF effects.

Further QC is needed for comparison.Further QC is needed for comparison. No instrument issue has been No instrument issue has been

identified.identified. More results, including Sounder, will More results, including Sounder, will

follow.follow.

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Purpose:Purpose: Verify GOES-14 Imager and Verify GOES-14 Imager and

Sounder IR channel Sounder IR channel calibration.calibration.

Establish benchmark for Establish benchmark for future inter-calibration.future inter-calibration.

Methods:Methods: GSICS GEO-LEO Inter-GSICS GEO-LEO Inter-

Calibration (Wu et al 2009).Calibration (Wu et al 2009).

DataData GOES Imager IR data, GOES Imager IR data,

AIRS/IASI data since Oct. 28, AIRS/IASI data since Oct. 28, 2009 2009

GOES Sounder and IASI data GOES Sounder and IASI data between Nov. 30, 2009-Dec. between Nov. 30, 2009-Dec. 13, 200913, 2009

GOES-14 Imager spectral response functions and the simulated AIRS/IASI spectra

GOES-14 Imager (upper) and Sounder (lower) spectral response functions and the simulated AIRS/IASI spectra

2. Initial Bias Evaluation of 2. Initial Bias Evaluation of GOES-14 IR ChannelsGOES-14 IR Channels

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•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

-1.28 -1.28 KK-1.15 -1.15 KK+0.96 +0.96 KK

+0.95 +0.95 KK+1.01 +1.01 KK-0.06 -0.06 KK-0.54 -0.54 KK-0.51 -0.51 KK-0.03 -0.03 KK

+0.17 +0.17 KK+0.16 +0.16 KK-0.08 -0.08 KK

2.1 GOES-14 Imager vs 2.1 GOES-14 Imager vs AIRS/IASIAIRS/IASI

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IASIGEO RbaR *Ch. #Ch. # ChannelChannel GOES – IASIGOES – IASI

(homo. Scene # <84)(homo. Scene # <84)

aa bb Tb (K)Tb (K) stdv (K)stdv (K)

11 14.71µm14.71µm 1.240(±0.777)1.240(±0.777) 0.976(±0.019)0.976(±0.019) 0.2630.263 0.1770.177

22 14.37µm14.37µm 1.244(±0.412)1.244(±0.412) 0.972(±0.010)0.972(±0.010) 0.1590.159 0.2360.236

33 14.06µm14.06µm -0.249(±0.300)-0.249(±0.300) 1.001(±0.006)1.001(±0.006) 0.1780.178 0.4250.425

44 13.64µm13.64µm 0.230(±0.258)0.230(±0.258) 0.998(±0.004)0.998(±0.004) 0.3070.307 0.6520.652

55 13.37µm13.37µm 0.206(±0.305)0.206(±0.305) 0.996(±0.005)0.996(±0.005) 0.2110.211 0.8530.853

66 12.66µm12.66µm 0.345(±0.301)0.345(±0.301) 0.993(±0.004)0.993(±0.004) 0.1870.187 1.3101.310

77 12.02µm12.02µm 0.3459±0.287)0.3459±0.287) 0.991(±0.004)0.991(±0.004) 0.000.00 1.1381.138

88 11.03µm11.03µm 0.269(±0.243)0.269(±0.243) 0.993(±0.004)0.993(±0.004) -0.048-0.048 0.9350.935

99 9.71µm9.71µm 0.108(±0.099)0.108(±0.099) 0.998(±0.004)0.998(±0.004) 0.1620.162 0.6130.613

1010 7.43µm7.43µm 0.005(±0.05)0.005(±0.05) 0.999(±0.004)0.999(±0.004) -0.047-0.047 0.4480.448

1111 7.02µm7.02µm 0.031(±0.038)0.031(±0.038) 0.992(±0.005)0.992(±0.005) -0.185-0.185 0.3890.389

1212 6.51µm6.51µm 0.036(±0.024)0.036(±0.024) 0.980(±0.008)0.980(±0.008) -0.144-0.144 0.3480.348

1313 4.57µm4.57µm 0.0002(±0.001)0.0002(±0.001) 1.012(±0.004)1.012(±0.004) 0.2140.214 0.3640.364

1414 4.52µm4.52µm -0.0009(±0.001)-0.0009(±0.001) 0.9997(±0.004)0.9997(±0.004) -0.031-0.031 0.2870.287

1515 4.45µm4.45µm -0.0007(±0.001)-0.0007(±0.001) 1.027(±0.007)1.027(±0.007) 0.2140.214 0.3640.364

1616 4.13µm4.13µm -0.002(±0.006)-0.002(±0.006) 1.004(±0.004)1.004(±0.004) -0.031-0.031 0.2870.287

1717 3.98µm3.98µm -0.0039(±0.0005)-0.0039(±0.0005) 1.013(±0.004)1.013(±0.004) -0.223-0.223 0.5490.549

18*18* 3.74µm3.74µm -0.011(±0.001)-0.011(±0.001) 1.949(±0.008)1.949(±0.008) 12.0112.01 0.8370.837

*: IASI does not cover this

channel fully

2.2 GOES-14 Sounder vs 2.2 GOES-14 Sounder vs IASIIASI

Much less bias for SW channels

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Purpose:Purpose: Confirm compliance of instrument spec.Confirm compliance of instrument spec. Establish benchmark for future Instrument Performance Establish benchmark for future Instrument Performance

Monitoring.Monitoring.

Methods:Methods: Standard deviation of space looks.Standard deviation of space looks. Standard deviation of blackbody looks will follow.Standard deviation of blackbody looks will follow.

DataData 11/30 – 12/1411/30 – 12/14

Analysis:Analysis: Mean noises are presented. Agree with CIMSS results.Mean noises are presented. Agree with CIMSS results. Detailed analysis will follow.Detailed analysis will follow.

3. Initial Noise Evaluation 3. Initial Noise Evaluation of of

GOES-14 IR ChannelsGOES-14 IR Channels

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Preliminary ResultsPreliminary ResultsInitial Evaluation of GOES-14 Bias

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20

40

60

80

100

120

140

160

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)

NE

dT

(m

K)

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Purpose:Purpose: Detect/Confirm instrument Detect/Confirm instrument

performance anomaly.performance anomaly. Diagnose for root causeDiagnose for root cause Verify efficacy of resolutionVerify efficacy of resolution

Methods:Methods: Plot telemetry data at various time Plot telemetry data at various time

scalesscales

DataData GVAR Block 11.GVAR Block 11.

Analysis:Analysis: Zero space count for Imager visible Zero space count for Imager visible

channel noon to midnight – space look channel noon to midnight – space look side?side?

More at More at http://www.star.nesdis.noaa.gov/smcdhttp://www.star.nesdis.noaa.gov/smcd/spb/fwu/homepage/GOES14_Imager_/spb/fwu/homepage/GOES14_Imager_IPM.phpIPM.php

SPLK for GOES-14 Imager visible channel

4. GOES-14 Instrument 4. GOES-14 Instrument Performance MonitoringPerformance Monitoring