Validation of IASI level 1 and level 2 products using IASI-balloon
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1 Validation of IASI level 1 and level 2 products using IASI-balloon C. Camy-Peyret, S. Payan, Y. Té, P. Jeseck, J. Bureau and I. Pépin / LPMAA D. Blumstein / CNES B. Tournier, D. Coppens, / Noveltis Outline IASI-ballon Spectral calibration of IASI-balloon Flight IASI05 on Feb from Esrange Radiometric calibration Geolocation and PTU soundings Retrievals Summary IASI Conference, Nov , Anglet, France 1
2 IASI-balloon in support to IASI calibration and geophysical validation C. Camy-Peyret, IRF, 18 December 2006
3 Why IASI-balloon? 1) A balloon-borne instrument with the IASI spectral coverage and similar (or better) performances in term of resolution and/or signal to noise is useful and important for the scientific preparation of the IASI mission. CNES has been supporting the development of this experiment within the IASI programme 2) IASI-balloon from a stratospheric gondola at 35 km has a similar observing geometry as IASI on MetOp (small atmospheric correction for the atmosphere between 35 km and MetOp altitude) 3) Test of instrument algorithms (radiometric calibration, non-linearity, ) 4) Radiative transfer studies and validation of the spectroscopy of atmospheric constituents 5) Test of inversion algorithms 6) Validation campaigns during the commissioning phase of IASI/MetOp and other mid to long term validation and/or scientific campaigns C. Camy-Peyret, IRF, 02/03/2007
4 Objectives for the validation of IASI 1) In coincidence with an overpass of MetOp, use IASI-balloon and companion instruments on the same payload for validating level 1b spectra of IASI-MetOp : spectral calibration instrument line shape radiometric calibration 2) Use the balloon spectra for validating level 2 products of EPS: T and H 2 O profiles O 3 profiles CO, CH 4 and N 2 O columns surface emissivity clouds (IR imager) 3) Obtain auxiliary information from independent meteo and ozone sounding in the vicinity of the launching site and from ground based measurements C. Camy-Peyret, IRF, 02/03/2007
5 Method 1) For level 1B spectra in short loop with the TEC (Technical Expertise Centre) in CNES, Toulouse: generate IASI-like spectra by degrading IASI-balloon spectra compare them with IASI-MetOp 2) For level 2 products: compare EPS products with retrievals from IASI-balloon and IASIlike spectra use the same retrieval algorithms on standard IASI-MetOp level 1c spectra 3) Provide the best atmospheric state for the time/location of the balloonsatellite coincidence C. Camy-Peyret, IRF, 02/03/2007
6 IASI-balloon experiment Mass : 456 kg C. Camy-Peyret, IRF, 02/03/2007
7 Emission configuration : Infrared Atmospheric Sounding Interferometer-balloon (IASI-balloon) gondola m < 500 kg Apodised resolution = 0.1 cm -1 OPD = 10 cm onboard PC Pentium II 266 MHz interferometer HgCdTe atmospheric constituents emission atmospheric constituents absorption baffles InSb 2 calibration blackbodies pointing mirror backscattered solar radiation clouds emission visible and IR CCD optical head Earth emission Atmospheric layers sounded by IASI-balloon 33 km (at float) Thermal emission in nadir sounding 0 km (ground) IASI Conference, Nov , Anglet, France 7
8 IASI-balloon instrument flights IASI01 13 March 2001 Kiruna (Sweden) Technological flight IASI02 5 August 2002 Kiruna (Sweden) SCIAMACHY validation IASI03 30 June 2005 Teresina (Brazil) IASI04 1 March 2006 Kiruna (Sweden) IASI05 22 Feb Kiruna (Sweden) IASI06 May Teresina (Brazil) Envisat validation REFIR (IFAC) on board Rehearsal of IASI validation IASI MetOp validation IASI MetOp validation mini-lidar + mini-doas on board IASI Conference, Nov , Anglet, France 8
9 IASI-balloon characteristics Two detector output optics : HgCdTe cm -1 InSb cm -1 Nominal OPD for emission measurements : d = 10 cm apodised resolution = 0.1 cm -1 (d max = 50 cm used in solar absorption) Two onboard black body (BB) cavities Warm BB 20 C nominal Cold BB -20 C nominal (Their temperature can be adjusted during flight depending on the thermal environment) Duty cycle : 1 min 25 s 1 cold BB Δ ~ ν =1 cm -1 8 scans : 20 s 1 scene Δ ~ ν =0.1 cm -1 8 scans : 55 s 1 warm BB Δ ~ ν =1 cm -1 4 scans : 10 s IFOV = 0.9 (FWHM of Gaussian IPSF), possible pointing ± 25 within the nadir direction. Foot print 600 m (depending on balloon altitude) 1 visible CCD imager (3 km 15 km) and 1 IR camera (3 km 15 km) C. Camy-Peyret, IRF, 02/03/2007
10 Optical head Rotation of the pointing mirror Compensation of the gondola movement "crabwise" drift WBB = warm blackbody CBB = cold blackbody Z WBB CBB velocity vector (wind direction) rotation axis of the pointing mirror CBB WBB Y IASI-balloon interferometer pointing mirror motor encoder rotation axis of the pointing mirror front of the gondola X nadir C. Camy-Peyret, IRF, 02/03/2007
11 Spectral calibration of the IASI-balloon spectra
12 Global spectral calibration of the IASI-balloon spectra Sampling of the interferogram using a stabilized He-Ne laser Spectral shift introduced by optical misalignment Theoretical lines of HITRAN lines of CO 2 [728 to 752 cm -1 ]for the HgCdTe channel 5 lines of CO 2 [2050 to 2057 cm -1 ] and 5 lines of CO [2150 and 2170 cm -1 ] for the InSb channel Lines position in the IASI-balloon atmospheric spectra after interpolation Determination of the laser frequency shift : Δν ~ L ~ ν ~ Δ ~ obs ν ν L = ~ ν L ~ ν Hitran Hitran After the spectral shift correction, a new verification with the same algorithm will give a new shift very close to zero
13 ANA : individual spectral calibration of the IASI-balloon spectra Each individual spectrum (index n), is compared to a reference atmospheric spectrum y 0 obtained by a radiative transfer forward model using the best a priori atmospheric state Using this analytical method on 4 micro-windows for each channel HgCdTe or InSb (relatively narrow and non-saturated atmospheric lines) we determine a mean scaling factor for each spectrum ε n After this individual spectral calibration, spectra are interpolated and resampled on a fixed wavenumber grid (step = 0.05 cm -1 ) The absolute wavenumber accuracy for generating IASI-like spectra, is about (consistent with the specification of for IASI- MetOp L1c spectra)
14 Spectral calibrated spectrum at IASI-MetOp resolution provided to the Technical Expertise Centre 1.0x x10-6 Radiance (W/(cm 2.sr.cm -1 )) 8.0x x x x x x x x Spectrum at 0.1 cm -1 [IASI-balloon] Spectrum at 0.5 cm -1 [IASI-MetOp] wavenumber (cm -1 )
15 IASI Conference, Nov , Anglet, France 15 Flight IASI05 from Esrange (Kiruna, Sweeden) Date of the flight 22 Feb Payload : IASI-balloon + infrared camera Conditions : very cold, within the vortex
![Footprints of IASI-MetOp and trajectory of IASI05 flight [1/2] IASI Conference, Nov.](/docs-images/76/73907167/images/16-0.jpg "13-16, 2007 - Anglet, France 16 22/02/2007 IASI-MetOp footprints Trajectory of IASI-balloon First overpass at")
16 Footprints of IASI-MetOp and trajectory of IASI05 flight [1/2] IASI Conference, Nov , Anglet, France 16 22/02/2007 IASI-MetOp footprints Trajectory of IASI-balloon First overpass at 18:14 UT (distance ~ 10 km)
![Footprints of IASI-MetOp and trajectory of IASI05 flight [1/2] IASI Conference, Nov.](/docs-images/76/73907167/images/17-0.jpg "13-16, 2007 - Anglet, France 17 22/02/2007 Second overpass at 19:54 UT (coinciding")
17 Footprints of IASI-MetOp and trajectory of IASI05 flight [1/2] IASI Conference, Nov , Anglet, France 17 22/02/2007 Second overpass at 19:54 UT (coinciding footprints)
18 Radiometric calibration of the IASI-balloon spectra
19 Instrument problems occurred during IASI05 IASI Conference, Nov , Anglet, France 19 Breakdown of the Thermalogic board which controls and stabilizes the two on board blackbody temperatures used for the radiometric calibration (during the preparation of the flight IASI05) Patch with a custom-made electronic board (temporary card) which reads the two blackbody temperatures (Pt100) The control of the temperatures was performed by the gondola housekeeping on board PC (CNES Nacelle Pointée) IASI05 flight in extremely cold conditions, the cooling system of the cold blackbody froze during flight ascent Use of another internal source of calibration in the limb view After return of the instrument at LPMAA in Ivry : Acquisition/installation of the new Thermalogic board for temperatures control Estimation of the temperature correction between the Thermalogic board and the temporary card But the first temperature dependence studies do not provide very satisfactory results
20 Using the IR camera temperatures [T IR ] Comparison of the brightness temperature T B from the Thermacam and from the IASI-balloon spectra (flight IASI03) 288 Thermacam <TB> over the IASI-balloon IFOV T B from IASI-balloon spectra ( cm -1, μm) 284 T B (K) View number 18th ESA Symposium, Visby, June 2007
21 Radiometric calibrated spectrum using T IR 300 Brightness temperature (K) #034 T B ( cm -1 ) = 234 K Wavenumber (cm -1 ) Some disagreement between this spectrum and a forward model using a meteorological sounding (in the CO 2 saturated band) - IASI05 flight in extremely cold conditions and in the vortex - Different locations for the sounding and balloon position? - Missing atmosphere above the balloon More studies should be carry out
22 Geo-location and PTU/O 3 soundings from Esrange
23 IASI-MetOp and IASI-balloon ground pixels (overpass 2) IASI Conference, Nov , Anglet, France 23
24 Coregistration of the IR-camera and a detailed map of Sweeden/Finland IASI Conference, Nov , Anglet, France 24
25 IASI Conference, Nov , Anglet, France 25 SSC PT soundings from Esrange on 22 Feb altitude (km) Temperature ( C)
26 SSC O 3 soundings from Esrange on 22 Feb altotude(km) :06 UT 17:25 UT O 3 vmr (ppmv) IASI Conference, Nov , Anglet, France 26
27 Retrievals of IASI-MetOp and IASI-balloon spectra: a case study
28 IASI Conference, Nov , Anglet, France 28 IASI-MetOp vs. IASI-like balloon measurements (simulation) 60.0 IASI-Balloon IASI IASI-Balloon IASI radiance (10-7 W/cm 2.sr.cm -1 ) radiance (10-7 W/cm 2.sr.cm -1 ) wavenumber (cm -1 ) wavenumber (cm -1 ) radiance (10-7 W/cm 2.sr.cm -1 ) IASI-balloon IASI wavenumber (cm -1 ) radiance (10-7 W/cm 2.sr.cm -1 ) IASI-balloon IASI wavenumber (cm -1 )
29 IASI Conference, Nov , Anglet, France 29 Location of the IASI-MetOp pixels used for LARA retrievals Overpass 1 ~ 18:14 TU 22 Feb Overpass 2 ~ 19:54 TU
30 IASI Conference, Nov , Anglet, France 30 IASI-MetOp retrieval for overpass 2 (preliminary) radiance (10-7 W/cm 2.sr.cm -1 ) radiance (10-7 W/cm 2.sr.cm -1 ) wavenumber (cm -1 ) IASI LARA wavenumber (cm -1 ) IASI-balloon LARA CO 2 1 column O 3 3 retrieval levels Brightness Temperature (K) Brightness Temperature (K) IASI LARA wavenumber (cm -1 ) IASI LARA wavenumber (cm -1 )
31 IASI Conference, Nov , Anglet, France 31 IASI-MetOp retrieval for overpass 2 (preliminary) radiance (10-7 W/cm 2.sr.cm -1 ) wavenumber (cm -1 ) IASI LARA IASI LARA N 2 O 1 column H 2 O 3 retrieval levels Brightness Temperature (K) IASI LARA wavenumber (cm -1 ) radiance (10-7 W/cm 2.sr.cm -1 ) wavenumber (cm -1 ) CH 4 1 column Brightness Temperature (K) IASI LARA wavenumber (cm -1 )
32 IASI Conference, Nov , Anglet, France 32 IASI-MetOp retrieval for overpass 2 (preliminary) radiance (10-7 W/cm 2.sr.cm -1 ) IASI LARA wavenumber (cm -1 ) CO 1 column Brightness Temperature (K) IASI LARA wavenumber (cm -1 ) Retrieved vmr at surface : CO 2 : CH 4 : N 2 O : CO : 392 ± 5 ppmv 2.20 ± 0.28 ppmv 374 ± 50 ppbv 134 ± 70 ppbv
33 Cloud type from AVHRR (*) (*) source : IASI Conference, Nov , Anglet, France 33
34 IASI-balloon spectra and retrieval radiance (10-7 W/cm 2.sr.cm -1 ) IASI-balloon LARA wavenumber (cm -1 ) radiance (10-7 W/cm 2.sr.cm -1 ) IASI-balloon LARA wavenumber (cm -1 ) radiance (10-7 W/cm 2.sr.cm -1 ) wavenumber (cm -1 ) IASI-balloon LARA IASI Conference, Nov , Anglet, France 34 radiance (10-7 W/cm 2.sr.cm -1 ) wavenumber (cm -1 ) IASI-balloon LARA
35 IASI Conference, Nov , Anglet, France 35 Summary Very good spatial and temporal coincidence of IASI-MetOp and IASI-balloon for 2 overpass on 22 Feb during the flight IASI05 IASI-balloon experienced onboard blackbody problems during IASI05 Spectral calibration at IASI-balloon resolution is OK ( ) Radiometric calibration of IASI-balloon spectra not better than 1K Retrievals of IASI-MetOp spectra for the best space/time coincidences produce satisfactory residuals and reasonable level 2 products. Retrieved IASI-MetOp spectra do not show significant spectral shift (a fitted parameter in LARA) at the level of 3x10-6 Future work will include more refined analyses of scene inhomogeneities on IASI-MetOp retrievals using the IASI-balloon IR imager
36 IASI Conference, Nov , Anglet, France 36 Acknowledgements Team Nacelles pointées from CNES/CST in Toulouse (Jean Evrard) CNES balloon launching team and SSC Esrange teams CNES HQ Etude et Observation de la Terre through TOSCA
37 Backup slides IASI Conference, Nov , Anglet, France 37
38 IASI validation planing IASI Conference, Nov , Anglet, France 38
39 Instrument features supporting Cal/Val activities IASI Conference, Nov , Anglet, France 39 Raw interferograms transmitted to the ground (sampled : 1/408) Including continuous part of the signal (for NL correction) Synthesis of imaginary part of the on-board calibrated spectra Spectral Overlaps B1/B2, B2/B3 (under sampled : 1/120) Direct comparison of the calibrated spectra measured by 2 different detectors Spectral Radiometric 2 Cold Space Calibration Views : CS1, CS2 External Calibration Mode with Earth View Target Spatial oversampling Quasi-simultaneous measurement of the same scene by 2 different pixels IASI Integrated Imager (IIS)
40 Spectral calibration IASI Conference, Nov , Anglet, France 40
41 Spectral calibration IASI Conference, Nov , Anglet, France 41
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