MIPAS Validation Summary Herbert Nett - Plenary Session

MIPAS Validation Summary Herbert Nett - Plenary Session

MIPAS Validation Summary Herbert Nett - Plenary Session - MIPAS Validation Review - ESRIN - 913 December 2002 ESTEC / EEM-PPP Page 1 Measured NESR0 MIPAS NESR 0 (High Resolution Calibrated Spectrum) 1.0E-07 NESR (W cm -2 sr-1 cm) In-Flight (223K) Requirement On-Ground (231K) 1.0E-08 1.0E-09 500 700 900

1100 1300 1500 1700 1900 2100 2300 2500 Wavenumber (cm -1) MIPAS Validation Review - ESRIN - 913 December 2002 Page 2 Radiometric Performance Radiometric Accuracy Wavenumber range [cm-1] value In-flight validation

685 - 970 2 * NESRT+ 5 % [true source radiance] Ok 1570 - 2410 2 * NESRT+ 1 % [true source radiance] Ok Dynamic range (BB source) (0 230) K Ok Critical aspects ice contamination on focal plane optics non-Linearity of detectors in bands A, AB and B -> strongest impact in band A ! MIPAS Validation Review - ESRIN - 913 December 2002 Page 3 Level 2 algorithm verification: critical aspects variabilities in target gas signatures (latitudinal, day/night dependencies, perturbed chemistry )

knowledge of systematic error sources (modelling of instrumental errors, interfering species, spectroscopic errors, Non-LTE ...) code robustness wrt instrumental effects & extreme atmospheric conditions MIPAS Validation Review - ESRIN - 913 December 2002 Page 4 Results of orbit #504 retrievals: all species Altitude [km] VMR (ppmv) Water vapour Ozone CH4 HNO3 N2O NO2 Orbital coordinate [deg] MIPAS Validation Review - ESRIN - 913 December

2002 Page 5 Summary: MIPAS Level 2 error budgets Target parameter, species retrieval range [km] temperature estimated error (global average) dominating error (sys only) ESD Total (random+sys) 12 - 68 1-2K 25K

ILS, Hitran, O3 pressure 12 68 13% 36% Hitran, GAIN, O3, O3 12 60 4 23 % 8 30 % ILS, Tem, Hitran HNO3 12 42 3 37 % 7 44 %

Hitran, Tem, ILS H2O 12 60 4 24 % 16 49 % Hitran, GRA, Tem CH4 12 60 6 20 % 11 29 % Tem, GRA, Hitran N2O 12 47 8 26 % 13 29 % Tem, Hitran, GRA

NO2 24 47 [ Extracted from presentation A. Dudhia / U. of Oxford ] 11 27 % 13 65 % GAIN: gain cal error GRA: horizontal T gradient ILS: ILS shape error MIPAS Validation Review - ESRIN - 913 December 2002 NLTE, Tem, GRA Tem: temperature error Hitran: spectrocopy error NLTE: Non-LTE effects Page 6 By: H. Oelhaf / FZ-IMK MIPAS-B2 vs. MIPAS-Envisat Comparisons Temperature HNO3 MIPAS Validation Review - ESRIN - 913 December

2002 Page 7 NDSC /O3 sonde & MW radiometer Payerne (av., after 13 Nov) NDSC / Lidar OHP Lauder (NZ) By: J.C. Lambert, V. Soebijanta, BIRA/IABS MIPAS Validation Review - ESRIN - 913 December 2002 Page 8 By: A. Dethof / ECMWF MIPAS Good agreement oftemperatures MIPAS temperatures with ECMWF analyzed temperatures over large part of stratosphere (diff < 2%) Largest differences at 0.1 hPa (ECMWF model top) MIPAS too cold at bottom end of profiles especially in tropics (cloud contamination?). Improvement after upgrade on Global averages, 11.-17.11.2002

13.11.2002. Very robust. Same features seen every week. MIPA Departure S s MIPAS - EC Improvement ECMWF after 13.11.02 MIPAS Validation Review - ESRIN - 913 December 2002 Page 9 By: A. Dethof / ECMWF MIPAS Ozone Reasonable agreement with ECMWF ozone over large part of stratosphere Some differences might be explained by known ECMWF model bias: e.g. tropical O3 max. lower in ECMWF than MIPAS - 90-65N: ECMWF > MIPAS over large part of stratosphere Unrealistically large MIPAS ozone values in lower stratosphere (cloud contamination?). Improvement after upgrade on 4.-10.11.02

25.11.-1.12.02 ECMWF 13.11.2002. MIPAS Improvement after 13.11.02 MIPAS Validation Review - ESRIN - 913 December 2002 Page 10 Cloud top height distribution in MIPAS measurements (~4100 profiles, 7 25 Sep 2002) By: J. Remedios/ U. Of Leicester MIPAS Validation Review - ESRIN - 913 December 2002 Page 11 MIPAS L2: Geophysical validation Target parameter Category Result / Status T: good agreement (typ < 2%)

O3: good, small bias (+ 1...2 ppmv) ECMWF, UKMet Office, H2O: 5 15% bias h > 55 km, < 20 km BASCOE/4D, HALOE, ODIN T, H2O, O3 Sat. I/C & assimilation: T, H2O, O3, HNO3, CH4, N2O, NO2 Balloons, aircrafts: MIPAS-B2, TRIPLE (insitu) M-55 (IR/FIR & in-situ) T: good agreement (~ 1K) O3: good, small bias(+) H2O: too high h > 55 km, too low < 20 km HNO3: bias (-) CH4 : bias (+) for h < 25 km CH4, N2O, NO2: tendency to oscillations H2O, O3, HNO3, CH4, N2O, NO2 Ground-based:

good agreement for O3 FTIR, LIDAR, MWR other species: analysis ongoing MIPAS Validation Review - ESRIN - 913 December 2002 Page 12 MIPAS L2: Geophysical validation / summary temperature: good agreement with correlative measurements & analyses O3: generally good agreement, bias +12 ppmv (?) -> spect. database H2O: too high > 55 km -> Non-LTE (?) too low < 20 km -> cloud contamination, MW choice, conv. thresholds HNO3:

bias (-) CH4, N2O, NO2: tendency to vertical oscillations -> T error propagation (F - R differenc in detector NL correction/band A) ACVT-MASI: -> updated spectroscopic data (mipas_hitran v2 -> v3) will yield ~ 10 % higher mixing ratios the MIPAS data set (including also HNO 3, CH4, NO2) is the only data set that is self-consistent and can be included in existing assimilation systems , MIPAS Validation Review - ESRIN - 913 December 2002 Page 13 Retrieval altitude-range -75 MIPAS Validation Review - ESRIN - 913 December 2002 Page 14 Lessons learned / critical areas potential for reduced total errors by extended MW selection (pT,

H2O, ) perturbations in non-regularised profile retrievals due to oscillations in fw rev sweep radiances (re-check after enhanced NL correction scheme in place) extension of retrieval height range towards higher and lower limb heights will improve the profile accuracy also within the nominal height interval inaccuracies in spectroscopic line data (incl. error correlations) -> essential also for gephysical validation (HNO3 ) MIPAS Validation Review - ESRIN - 913 December 2002 Page 15 Baseline modifications: L2 algorithm subject handle sweeps at low altitudes & low latitudes by constraining base profile correction in pT handling of single microwindow OMs Status / IPF

PDS implementation in progress (-> Feb 2003, tbc) recursive pT & H2O retrievals cloud detection & filtering of L1B input during L2 preprocessing report cloud index profiles in Level 2 report IG profile information in Level 2 extend retrieval range to < 12 km & 68 km extend microwindow selection for pT & H2O other modification (tbd, result of ACVT activities) MIPAS Validation Review - ESRIN - 913 December 2002 approach: Detailed definition & prototyping -> start early 2003 (tbc) Page 16 MIPAS error budgets Re-assess total budgets, take into account: - mean profiles and variabilities of contaminants - impact of assumed profile shape above highest tangent altitude - impact of convergence thresholds

Reporting ESD & temperature error propagation -> Level 2 products Systematic components (HITRAN, NLTE, gain, ..) -> off-line information, could be provided as TN & coded data sets (as done for MIPAS Averaging Kernels) MIPAS Validation Review - ESRIN - 913 December 2002 Page 17 Conclusions MIPAS in-flight calibration & characterisation tasks completed (some activities & documentation under finalisation) geophysical validation: first intercomparison results available (ground-based, balloon sensors, assimilation studies, ) instrument in excellent health, consolidated L0 -> L2 processing chain stable algorithm baseline (May 02->), only minor changes in aux data important update 13 Nov (LOS pointing correction, L2 tuning parameters) algorithm update in progress (pT/H2O loop, cloud detection) MIPAS Validation Review - ESRIN - 913 December 2002 Page 18

Recommendatio ns Level 1B -> release ok Level 2: -> release after update of IPF (incl. cloud detection, pT-H2O iteration loop, mipas_hitran v.3.0) Essential: supply MIPAS data users with - total error budgets - averaging Kernels - spectroscopic database - reports on geophysical validation campaigns MIPAS Validation Review - ESRIN - 913 December 2002 Page 19 The MIPAS Calibration & Algorithm Verification Team P. Mosner/R.Gessner Astrium/D [ instrument engineering / operations ] G. Perron, G. AubertinABB BOMEM

[ ESL / Level 1B ] Th. Fiksel DJO [ L1B&2 s/w engineering ] S. Bartha Astrium/D [ L2 s/w engineering ] B. Carli, P. Raspollini IFAC-CNR [ ESL / Level 2 ] M. Carlotti, M. Ridolfi U. of Bologna [ ESL / Level 2 ] B. Dinelli ISAC-CNR [ ESL / Level 2 ] A.Dudhia, C.D. Rodgers Univ. of Oxford [ ESL / Level 2; project AO # 323 ] J.M. Flaud LPM/Paris [ ESL / Level 2 ] M. Hoepfner/H. Oelhaf FZ-IMK [ ESL / Level 2 ] T.v. Clarmann FZ-IMK [AO#145 & AMIL2DA / L1B&2 analysis ] M. Lopez-Puertas IAA [ project AO # 304 / L2 analysis ] M. Birk/G. Wagner

DLR-IMF [ project AO # 652 / L1B analysis ] J.J. Remedios/R. Spang Univ. of Leicester [ project AO # 357 / L1B&2 analysis ] G. Schwarz DLR-IMF [ ESL / Level 2 ] ESTEC: J.C. Debruyn, A. Burgess (now U. Oxford), J. Langen, M. Sanchez, H. Nett ESOC:MIPAS A. OConnell EUMETSAT), D. Patterson Page 20 Validation(now Review - ESRIN - 913 December , F. Diekmann, A. Rudolph 2002

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