CrIS Calibration/Validation Status - NASA › ... › files › 55_strow_cris.pdf · CrIS Window...
Transcript of CrIS Calibration/Validation Status - NASA › ... › files › 55_strow_cris.pdf · CrIS Window...
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
CrIS Calibration/Validation Status
L. Larrabee Strow, H. Motteler, P. Schou, B. Imbiriba, S. Hannon
Physics Department andJoint Center for Earth Systems Technology
University of Maryland Baltimore County (UMBC)
Memorial Get-Together for Scott Hannon:Nov 27, 3:00 pm UMBC Physics Department
4th Floor Lecture Hall, Please RSVP to [email protected]
November 15, 2012
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
Overview
Frequency calibration
Short-wave high-resolution mode results
Radiometric validation
Main Results
Frequency calibration working very well
SDRs exhibit boxcar ringing inconsistencies: up to 1K
Hamming apodization reduces these problems significantly
Comparisons to AIRS, IASI within 0.2K or less
Evidence for a ∼0.2K systematic calibration error in far long-wave
High resolution works very well! Could provide continuation forNASA carbon monoxide record
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
ν Calibration Overview
CrIS In-orbit Neon Cal unchanged from TVAC!
Examine time series of Neon calibration using (a) Long-waveand (b) Mid-wave bands.
Calibration done daily using clear ocean tropical subsets
650 700 750 800 850 900 950 1000 1050 11000.5
0.4
0.3
0.2
0.1
0
0.1
0.2
0.3
0.4
0.5
Wavenumber (cm 1)
FOV3
F
OV8
in K
Spectral Cal Difference between 2 Detectors with existing LUTs
7.5 ppm Cal Error
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
CrIS Frequency Calibration vis Upwelling RadiancesUsing Long-wave Band
Left: All fovs, Right: Mean and Std (over FOVs)
Apr May Jun Jul Aug Sep Oct Nov−2.5
−2
−1.5
−1
−0.5
0
0.5
ν E
rror
(pp
m)
123456789
Apr May Jun Jul Aug Sep Oct Nov0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
ν E
rror
(pp
m)
−1 x Mean band1 ν calStd over Fovs
Upwelling frequency calibration mirrors the Neon calibration of the metrologylaser. If the CMO has not been updated (waits for a 2 ppm change), this meansthe metrology laser has indeed drifted. If the Neon was drifting, we would notsee the same shift in the upwelling spectra (again assuming the CMO operatorremains unchanged). Slight differences among FOVs.
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
CrIS Frequency Calibration vis Upwelling RadiancesUsing Mid-wave Band
Left: All fovs, Right: Mean and Std
Apr May Jun Jul Aug Sep Oct Nov−4
−3.5
−3
−2.5
−2
−1.5
−1
−0.5
0
0.5
1
ν E
rror
(pp
m)
123456789
Apr May Jun Jul Aug Sep Oct Nov0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
ν E
rror
(pp
m)
−1 x Mean band2 ν calStd over Fovs
The mid-wave frequency calibration shows a frequency drift very similar tolong-wave. I do not know why the mid-wave frequency calibration varies by up to3.5 ppm among FOVs. We saw this in the Feb. 25 data. D. Tobin’s relativecalibration indicates this is incorrect.
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
Neon vs Upwelling ν Calibration
Apr May Jun Jul Aug Sep Oct Nov0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
ν E
rror
(pp
m)
−1 × Mean band1 ν calStd over FovsNeon ν cal +1.3 ppm
SDR algorithm waits for a 2 ppm Neon shift to re-compute new CMOPresumably that has not yet happened, so cannot testThus, upwelling calibration roughly follows NeonDifferences may be upwelling algorithm issues?
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
Radiometric Variability versus 9 Detectors
Enable NWP Centers to use common bias correction for alldetectors. Lesson learned from IASI.
1000 1500 2000 25000
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
Wavenumber (cm−1)
Bias
Std
in K
UnapodizedApodized
Biases&vs&Radia*ve&Transfer&Model&(CRTM)&simulated&radiances&
Clear&Sky&Obs>Calcs&
Overall'bias'<'0.2'K'FOV222FOV'differences'<'0.1'K'
23#
Standard&devia*on&(over&9>FOVs)&of&Bias&vs&RTM&simulated&radiances&
Bias#(K
)#
Y.#Chen,#NOAA#STAR#CRTM#(LBLRTM)
L.#Strow,#UMBC#SARTA#(kCARTA)
FOV1# FOV2# FOV3#
FOV4# FOV5# FOV6#
FOV7# FOV8# FOV9#
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
Bias vs Interferometer Scan DirectionBoxcar Apodization, greatly reduced with Hamming, etc. apodization
Ringing differences with scan direction. Does not appear to be analgorithm bug. Also seen in low-wavenumber edge of water band,and in EDR residuals, even with apodization.
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
Noise PerformanceWork by Mark Esplin, Utah State Space Dynamics Laboratory
800 1000 1200 1400 1600 1800 2000 2200 2400 2600
10-1
100
Wavenumber (cm-1)
Rad
ianc
e (m
W/m
2 sr c
m-1
)
CrIS Spec.IASI OriginalIASI - CrIS Res.CrIS On-OrbitCrIS On-Orbit Full ResAIRS - CrIS Res.
NEd
T, 0 K
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
CrIS High Resolution Mode
UMBC has processed all the CrIS high-resolution mode datafrom Feb. 23, 2012 into calibrated radiances using CCAST
Liens on these radiances:Non-linear correction not applied (no effect on shortwave)Nominal geolocation (good enough for most purposes)Not in SDR formatUses our best-effort CMO apodization removal operators fromthe July time-frame.These data recorded with the old FIR decimation filter
We have computed clear-sky observed radiances for everyobservation
For a single southern ocean granule we have compared thesedata to IASI data in the same region, suitably degraded to CrIS0.8 OPD resolution.
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
Example High-Resolution Spectra
800 1000 1200 1400 1600 1800 2000 2200 2400
180
200
220
240
260
280
Wavenumber (cm−1)
B(T)
in K
Normal ModeHigh−Res Mode −50K
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
Example Spectra: Shortwave Only
2150 2200 2250 2300 2350 2400 2450 2500 2550
180
200
220
240
260
280
300
Wavenumber (cm−1)
B(T
) in
K
Normal ModeHigh−Res Mode
Not Noise!
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
High-Resolution CMO Operator
UMBC developed a high-resolution CMO operator
Matrix inversion to derive CMO operator condition numbergoes from 1 for center FOV to 106 for corner FOVs.
With careful filtering, high condition number can be handled
Note below: large relative ν offset of off-axis spectra; Left:Normal Mode, Right: High-resolution Mode
2354 2356 2358 2360 2362 2364
−0.2
0
0.2
0.4
0.6
0.8
1
Wavenumber (cm−1)
Impu
lse
Res
pons
e
CornerSideCenter
2354 2356 2358 2360 2362 2364
−0.2
0
0.2
0.4
0.6
0.8
1
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
Relative Error in CMO Corrections
Plot shows single uniform 3x3 spectraDifference curves (from FOV5) are uniform in frequencyCorrection errors close to radiances values for cold observations.
2150 2200 2250 2300 2350 2400 2450 2500 2550−0.5
0
0.5
1
1.5
2
2.5
3
3.5
4
Wavenumber (cm−1)
Rad
ianc
e
FOV1FOV2FOV3FOV4FOV5FOV6FOV7FOV8FOV9
2150 2200 2250 2300 2350 2400 2450 2500−0.15
−0.1
−0.05
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
Wavenumber (cm−1)
Rad
ianc
e
FOV1FOV2FOV3FOV4FOV5FOV6FOV7FOV8FOV9
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
CMO Correction Errors Reduced with HammingApodization
Same data as in previous slide, but Hamming apodized
2150 2200 2250 2300 2350 2400 2450 2500 2550−0.5
0
0.5
1
1.5
2
2.5
3
3.5
Wavenumber (cm−1)
Rad
ianc
e
FOV1FOV2FOV3FOV4FOV5FOV6FOV7FOV8FOV9FOV corner − FOV5FOV side − FOV5
2200 2250 2300 2350 2400 2450 2500 2550
−0.05
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
Wavenumber (cm−1)
Rad
ianc
e
FOV1FOV2FOV3FOV4FOV5FOV6FOV7FOV8FOV9FOV corner − FOV5FOV side − FOV5
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
CMO Correction Errors in Brightness Temperature:Hamming
FOVn-FOV5 differences multiplied by 5X and offset by 260K
2150 2200 2250 2300 2350 2400 2450 2500 2550220
230
240
250
260
270
280
290
300
Wavenumber (cm−1)
B(T
) in
K
FOV1
FOV2FOV3
FOV4
FOV5
FOV6
FOV7FOV8
FOV9
+−1K (FOVn−FOV5)
2160 2180 2200 2220 2240
245
250
255
260
265
270
275
280
285
290
295
Wavenumber (cm−1)
B(T
) in
K
FOV1
FOV2
FOV3
FOV4
FOV5FOV6
FOV7
FOV8
FOV9+−1K (FOVn−FOV5)
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
High-Resolution Validation: CrIS vs IASI B(T)
2200 2250 2300 2350 2400 2450 2500
230
240
250
260
270
280
Wavenumber (cm−1)
B(T
) in
K
IASICrIS
(a) CrIS/IASI Obs, Hamming Apodized.
2170 2180 2190 2200 2210 2220245
250
255
260
265
270
275
280
285
Wavenumber (cm−1)
B(T
) in
K
IASICrIS
CO Lines
(b) CrIS/IASI Obs, Hamming Apodized:Zoom.
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
High-Resolution Validation: CrIS vs IASI BiasesBiases with respect to ECMWF
2200 2250 2300 2350 2400 2450 2500 2550
−1.5
−1
−0.5
0
0.5
1
1.5
Wavenumber (cm−1)
Bia
s in
K
IASICrIS
(c) CrIS/IASI Bias, Hamming Apodized.
2170 2180 2190 2200 2210 2220−1
−0.5
0
0.5
Wavenumber (cm−1)
Bia
s in
K
IASICrIS
Window Channels
Atmospheric CO Lines
(d) CrIS/IASI Obs, Hamming Apodized:Zoom.
Note in (c,d) above, one expects IASI and CrIS window channels to differby 0.1K due to diurnal variation in the SST. Here we use a constantdiurnally averaged SST. Thus, the bias difference between CrIS and IASI isabout 0.1K less than shown here for window channels!
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
CO Retrievals from High-Resolution Mode SpectraLeft: CrIS, Right: AIRS Color Scale in K
“Retrieval” is just bias between Obs and Calc radiances for a single CO channel.Calc radiances use ECMWF.Remove scenes where window radiance bias > 5K (Clouds).
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
CO Retrievals from High-Resolution Mode SpectaLeft: CrIS, Right: MOPPIT
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
CO Retrievals from High-Resolution Mode Specta
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
Frequency Calibration Using High-ResolutionShort-Wave
High-resolution data used to calibration Neon, 1 day’s worth
High-resolution brings out very stable features with spectralcontrast
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
High-Resolution SW Calibration of Neon
2200 2250 2300 2350 2400 2450 2500
220
225
230
235
240
245
250
255
260
265
270
Wavenumber (cm−1)
B(T
) in
K
All ChannelsNeon Cal Channels
Existing Neon calibration limited to non-polar clear ocean scenes (morebelow).
As previously stated, unable to achieve high Neon calibration accuracy withopaque LW, MW channels, which would allow calibration over the entireorbit.
High-resolution in the SW allows us to use the very high-peaking lines in the2350 cm−1 region, indicated by green circles above.
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
LW Opaque Channel Calibration of Neon
660 680 700 720 740 760
220
225
230
235
240
245
250
255
260
265
270
Wavenumber (cm−1)
B(T
) in
K
All ChannelsNeon Cal Channels
(e) LW opaque Neon cal channels.
0.01 0.02 0.03 0.04 0.05
50
100
150
200
250
300
350
Kernel Function
Pre
ssur
e in
mba
r
LWSW
(f) LW vs SW cal channel kernels.
Opaque LW channels include emission from 200 mbar. Leads to inaccurateNWP calculations (clouds, polar) with poor performance in the polar night.
Moreover, LW opaque channel frequency calibration not accurate;presumably due to NWP radiance calculation errors.
With high-resolution, can use extremely high-peaking CO2 channel (5-10mbar, 30+ km) with very good performance.
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
Final Results: Neon Frequency Calibration
−80 −60 −40 −20 0 20 40 60 80−20
−15
−10
−5
0
5
10
15
20
25
Latitude
Neo
n O
ffset
in p
pm
LW High−AltitudeSW High−AltitudeLW Operational
Each circle represents a 360 second
period that allowed an accurate
calibration.
Present operational Neon: black circles, LW window, ± 40 degrees latitude.
LW opaque channels provide more observations (blue circles). But, apparent5 ppm offset, and very poor performance in the polar night.
SW opaque using CrIS high-spectral resolution mode gives extremely goodperformance, low noise, well into the polar night portion of the orbit.
SW high-resolution agrees very well with LW window region Neoncalibration, maybe 1 ppm.
IASI (METOP-A/B) uses these channels for all metrology laser calibration forall three bands.
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
Radiance Intercomparisons
Following slides are a small sample of radiometricintercomparisons between CrIS and AIRS/IASI.
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
CrIS AIRS SNO BT PDF Differences: Dave Tobin/UW
CrIS%AIRS%Lo
g%Num
ber%
BT%Distribu6
ons%
SW%window%2510%cm@1%
Upper%Trop%H2O%1592%cm@1%
LW%window%835%cm@1%
BT%Differen
ce%
Distrib
u6on
s%
0.020%±%0.004%K% 0.067%±%0.002%K% @0.058%±%0.003%K%
20
CrIS/AIRS%comparisons%for%Sample%Wavenumber%Regions%
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
CrIS Detector InterCal using AIRS/VIIRS:Dave Tobin/UWOnly considering CrIS Inter-FOV differences
1 2 3 4 5 6 7 8 9−0.1
−0.08
−0.06
−0.04
−0.02
0
0.02
0.04
0.06
0.08
0.1
FOV #
BT
Dif
(K)
Mean FOV−2−FOV BT Differences
LW 672LW 830MW 1382MW 1585SW 2360SW 2500CrIS/VIIRS M13CrIS/VIIRS M16
1 2 3 4 5 6 7 8 9−0.1
−0.08
−0.06
−0.04
−0.02
0
0.02
0.04
0.06
0.08
0.1
FOV #
BT D
if (K
)
Median CrIS−AIRS BT Differences, w/ FOV5 diff subtracted off
LW 672LW 830MW 1382MW 1585SW 2360SW 2500
! Longwave)and)Midwave)differences)are)~30mK)or)less;)Could)be)removed)with)
further)refinements)to)a2)values)at)the)~5%)level;)under)invesBgaBon)
! Differences)for)FOVs)3/6/9)for)Shortwave)Opaque)regions)are)somewhat)larger;)
also)currently)under)invesBgaBon)
CrIS)FOVO2OFOV)Radiometric)Differences)
22
“CrISOonly”)and)CrIS/VIIRS))CrIS/AIRS))
FOV)#) FOV)#)
BT)Diff)(K))
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
CrIS and IASI Double-DifferenceUsing NWP Tropical Clear Scene Biases
800 1000 1200 1400 1600 1800 2000 2200 2400 2600−0.2
−0.1
0
0.1
0.2
0.3
0.4
0.5
0.6
Wavenumber (cm−1)
CrI
S −
IAS
I in
K
SST Diurnal Correction
CrIS Bias vs IASI Bias (relative to ECMWF), tropics, ocean only
Very good agreement. But SST in calcs off by 0.1K! (maybe)
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
CrIS and IASI SNOs + DDs: SNOs for May 2012 (LW)SNOs from JPL Sounder PEATE: 10 min, 8 km windows, S. Hemis: -73 deg S.
650 700 750 800 850 900 950 1000 1050
−0.1
−0.05
0
0.05
0.1
0.15
0.2
0.25
Wavenumber (cm−1)
CrI
S−
IAS
I in
K
IDPS Box:SNOIDPS Hamming:SNOStd Err:SNOIDPS−CCAST HammingCrIS−IASI:DD
CrIS-IASI boxcar apodization has large ringing. Uncertain to cause, used all 4 IASIFOVs, all 9 CrIS FOVs for now.
Significant (for climate) offset in the longwave!
Red curve is CrIS from CCAST (UW/UMBC Matlab SDR testbed algorithm). CCASTmuch closer to IASI, but more work needed.
CrIS-IASI DD is bias double-difference from ECMWF
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
CrIS and IASI SNOs + DDs: SNOs for May 2012 (LW)SNOs from JPL Sounder PEATE: 10 min, 8 km windows, S. Hemis: -73 deg S.
650 700 750 800 850 900 950 1000 1050
−0.1
−0.05
0
0.05
0.1
0.15
0.2
0.25
Wavenumber (cm−1)
CrI
S−
IAS
I in
K
IDPS Box:SNOIDPS Hamming:SNOStd Err:SNOIDPS−CCAST HammingCrIS−IASI:DD
CrIS-IASI boxcar apodization has large ringing. Uncertain to cause, used all 4 IASIFOVs, all 9 CrIS FOVs for now.
Significant (for climate) offset in the longwave!
Red curve is CrIS from CCAST (UW/UMBC Matlab SDR testbed algorithm). CCASTmuch closer to IASI, but more work needed.
CrIS-IASI DD is bias double-difference from ECMWF
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
CrIS and IASI SNOs + DDs: SNOs for May 2012 (LW)SNOs from JPL Sounder PEATE: 10 min, 8 km windows, S. Hemis: -73 deg S.
650 700 750 800 850 900 950 1000 1050
−0.1
−0.05
0
0.05
0.1
0.15
0.2
0.25
Wavenumber (cm−1)
CrI
S−
IAS
I in
K
IDPS Box:SNOIDPS Hamming:SNOStd Err:SNOIDPS−CCAST HammingCrIS−IASI:DD
CrIS-IASI boxcar apodization has large ringing. Uncertain to cause, used all 4 IASIFOVs, all 9 CrIS FOVs for now.
Significant (for climate) offset in the longwave!
Red curve is CrIS from CCAST (UW/UMBC Matlab SDR testbed algorithm). CCASTmuch closer to IASI, but more work needed.
CrIS-IASI DD is bias double-difference from ECMWF
33
Intro Validation High-Res Mode CO High-Res ν Cal Intercal
CrIS and IASI SNOs + DDs: SNOs for May 2012 (LW)SNOs from JPL Sounder PEATE: 10 min, 8 km windows, S. Hemis: -73 deg S.
650 700 750 800 850 900 950 1000 1050
−0.1
−0.05
0
0.05
0.1
0.15
0.2
0.25
Wavenumber (cm−1)
CrI
S−
IAS
I in
K
IDPS Box:SNOIDPS Hamming:SNOStd Err:SNOIDPS−CCAST HammingCrIS−IASI:DD
CrIS-IASI boxcar apodization has large ringing. Uncertain to cause, used all 4 IASIFOVs, all 9 CrIS FOVs for now.
Significant (for climate) offset in the longwave!
Red curve is CrIS from CCAST (UW/UMBC Matlab SDR testbed algorithm). CCASTmuch closer to IASI, but more work needed.
CrIS-IASI DD is bias double-difference from ECMWF
34
Intro Validation High-Res Mode CO High-Res ν Cal Intercal
CrIS and IASI SNOs: Data for May 2012 (MW)
1300 1400 1500 1600 1700
−0.2
−0.15
−0.1
−0.05
0
0.05
0.1
0.15
0.2
NH (day)
Wavenumber (cm−1)
CrI
S−
IAS
I in
K
IDPS BoxcarIDPS HammingStd. Err
CrIS-IASI boxcar apodization again has ringing.
Very good agreement. Can we determine interconsistency below 0.05K?
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
CrIS-AIRS SNOs LocationsWith 10-min,8 km window obtain full latitude range!
−100 −50 0 50 1000
1000
2000
3000
4000
5000
6000
7000
Latitude
SN
Os
per
Mon
th
Unlike IASI-AIRS or IASI-CrIS, wide latitude range of SNO’s.
This allows very detailed inter-comparisons as a function of scene type. Here we
examine SNO differences with scene temperature for one channel.
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
2552 cm−1 SNOs for AIRS, CrIS
160 180 200 220 240 260 280 300 3200
2000
4000
6000
8000
10000
12000
14000
16000
B(T) in K
Num
ber
of O
bs
AIRSCrIS
160 180 200 220 240 260 280 300 320180
200
220
240
260
280
300
320
AIRS B(T) in K
CrI
S B
(T)
in K
2552 cm−1
Good number of SNOs over a large range of B(T)’s
CrIS hits a B(T) floor around 200K.
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Intro Validation High-Res Mode CO High-Res ν Cal Intercal
SNO AIRS-CrIS: LongwaveEarly Global SNO Comparisons Using AIRS-to-CrIS Conversion
700 750 800 850 900 950 1000 1050−1
−0.8
−0.6
−0.4
−0.2
0
0.2
0.4
0.6
0.8
1
AIR
S−
CrI
S in
K
1200 1250 1300 1350 1400 1450 1500 1550 1600−1
−0.8
−0.6
−0.4
−0.2
0
0.2
0.4
0.6
0.8
1
Wavenumber (cm−1)
AIR
S−
CrI
S in
K
38
Intro Validation High-Res Mode CO High-Res ν Cal Intercal
CCAST vs IDPS: Avg Radiometric Differences
Longwave
650 700 750 800 850 900 950 1000 1050
−0.4
−0.3
−0.2
−0.1
0
0.1
0.2
Wavenumber (cm−1)
∆ B
(T)
in K
Midwave: 0.006K
1300 1400 1500 1600 1700
−1
−0.5
0
0.5
1
Wavenumber (cm−1)
∆ B
(T)
in K
Shortwave: 0.03K
2150 2200 2250 2300 2350 2400 2450 2500 2550
−1
−0.5
0
0.5
1
Wavenumber (cm−1)
∆ B
(T)
in K
Longwave: FOVs 1-3,4-6
Midwave: FOVs 1,6,9
Averaged over all FOVs forshortwave (no non-linear)
39
Intro Validation High-Res Mode CO High-Res ν Cal Intercal
Possible Errors for High Temperature ScenesReal part of 860 cm−1 vs Imaginary Part
Color scale is number of observations