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SCIAMACHY level-1 validation using radiometric calibration of balloonborne DOAS/LPMA spectrometers Level-1 Products: - solar SCIAMACHY level-1 validation using radiometric calibration of balloonborne DOAS/LPMA spectrometers Level-1 Products: - solar irradiance (occultation geometry) - radiance (addition, nadir geometry) Cooperation: -LPMA Paris (C. Camy-Peyret) -IUP Heidelberg (K. Pfeilsticker) -IUP Heidelberg (T. Wagner) -IUP Bremen (A. Richter) ___________________________ IUP Univ. Bremen, W. Gurlit, Paris Meeting Nov. 2002

Progress: 1) Calibration Lab has been set up with 3 fully certified and characterized Progress: 1) Calibration Lab has been set up with 3 fully certified and characterized reference sources (NIST & PTB) 2) Campaign sources can be calibrated in-house Solar irradiance calibration source for balloonborne occultation instruments LPMA and DOAS (campaign use, 300 -2400 nm) beam geometry optimized ___________________________ IUP Univ. Bremen, W. Gurlit, Paris Meeting Nov. 2002

Method for measurement of TOA solar irradiance using balloonborne LPMA-DOAS in occultation 1 - Method for measurement of TOA solar irradiance using balloonborne LPMA-DOAS in occultation 1 - radiometric calibration of ballonborne sensors 2 - measurements in occultation geometry at various solar elevation angles 3 - calculation of airmass-factors 4 - extrapolation of airmass-factors to AMF = 0 using Langley-plot method 5 - result is TOA (extraterrestrial) solar irradiance ___________________________ IUP Univ. Bremen, W. Gurlit, Paris Meeting Nov. 2002

3) Additional sensors (nadir+zenith) : extended to airborne (AMAXDOAS) and ground-based (Bremen & Nairobi) 3) Additional sensors (nadir+zenith) : extended to airborne (AMAXDOAS) and ground-based (Bremen & Nairobi) DOAS for level-1 radiance validation (UV-VIS) ___________________________ IUP Univ. Bremen, W. Gurlit, Paris Meeting Nov. 2002

Radiometric calibration before and after flight to Kiruna ___________________________ IUP Univ. Bremen, W. Gurlit, Radiometric calibration before and after flight to Kiruna ___________________________ IUP Univ. Bremen, W. Gurlit, Paris Meeting Nov. 2002

Method for radiance measurements -radiometric calibration of sensors, then measurement -modelling radiation transfer (SCIATRAN) Method for radiance measurements -radiometric calibration of sensors, then measurement -modelling radiation transfer (SCIATRAN) -using measured aerosol and trace gas data for realistic model absolute radiance measurement (ground-based DOAS Bremen) illustration of method (preliminary result) ___________________________ IUP Univ. Bremen, W. Gurlit, Paris Meeting Nov. 2002

Winter 2003 Kiruna Campaign: solar irradiance measurements using absolute calibration of LPMA / DOAS Winter 2003 Kiruna Campaign: solar irradiance measurements using absolute calibration of LPMA / DOAS TOA solar irradiance calculated using Langley-Plot (example, historic data) ___________________________ IUP Univ. Bremen, W. Gurlit, Paris Meeting Nov. 2002

Future Activities for LV-1 Validation -use of ground-based DOAS (zenith-sky) -use of airborne AMAXDOAS Future Activities for LV-1 Validation -use of ground-based DOAS (zenith-sky) -use of airborne AMAXDOAS (nadir + zenith) -use of LPMA-DOAS balloon (occultation) -option: use of mini-DOAS balloon (nadir) Calibration stability of ground-based and airborne DOAS 3%, improvements possible Calibration stability of balloonborne LPMA, DOAS, mini DOAS not yet known ___________________________ IUP Univ. Bremen, W. Gurlit, Paris Meeting Nov. 2002

Sciamachy validation using H 2 O and CH 4 profiles obtained in-situ by ballon-borne Sciamachy validation using H 2 O and CH 4 profiles obtained in-situ by ballon-borne TDL (tunable diode laser) measurements with the CHILD compact high-altitude insitu laser diode Spectrometer Partners: -Univ. Heidelberg -TRIPLE (Jülich: C. Schiller, F. Stroh, Frankfurt A. Engel) ___________________________ IUP Univ. Bremen, W. Gurlit, Paris Meeting Nov. 2002

CHILD measurement of water vapor and methane profiles on TRIPLE flight from Aire sur CHILD measurement of water vapor and methane profiles on TRIPLE flight from Aire sur L´Adour, 24. 09. 2002, (descent), matched with SCIAMACHY overpass Temporal resolution: 1 sec. for averaged data (2 -4 meters altitude resolution) ___________________________ IUP Univ. Bremen, W. Gurlit, Paris Meeting Nov. 2002

TRIPLE-flight with CHILD from ASA on 24 -SEP-2002 <overpass SCIAMACHY - match at the TRIPLE-flight with CHILD from ASA on 24 -SEP-2002

Future activities for the CHILD spectrometer . . continue missions with TRIPLE ___________________________ IUP Future activities for the CHILD spectrometer . . continue missions with TRIPLE ___________________________ IUP Univ. Bremen, W. Gurlit, Paris Meeting Nov. 2002