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 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 - 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) 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, Paris Meeting Nov. 2002
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 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 (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 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 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 middle of descent (30 -40 h. Pa) ___________________________ IUP Univ. Bremen, W. Gurlit, Paris Meeting Nov. 2002
Future activities for the CHILD spectrometer . . continue missions with TRIPLE ___________________________ IUP Univ. Bremen, W. Gurlit, Paris Meeting Nov. 2002
Скачать презентацию SCIAMACHY level-1 validation using radiometric calibration of balloonborne
fee7bf9fd36beacaac4b32554fc903ad.ppt