Nine Years of Atmospheric Remote Sensing with SCIAMACHY

Nine Years of Atmospheric Remote Sensing with SCIAMACHY – Atmospheric Parameters and Data Products Lichtenberg, G. and SCIAMACHY Quality Working Group: DLR-IMF, IUP University Bremen, SRON, IASB-BIRA, KNMI, ESA

Topics The Instrument Quality Working Group Level 0 -1 processing Level 1 -2 processing Summary & Conclusions Pointers to information Slide 2 IGARSS 2011 > G. Lichtenberg > 28 July 2011

SCIAMACHY Viewimg Geometries Slide 3 IGARSS 2011 > G. Lichtenberg > 28 July 2011

Slide 4 IGARSS 2011 > G. Lichtenberg > 28 July 2011

SCIAMACHY Quality Working Group The SQWG was established in 2006 to – Take responsibility for the whole development cycle from scientific studies to operational products – Serve as sole point of contact for agencies (ESA, DLR, NIVR, BIRA) for everything processor related – Delivers the baseline prototype processors Level 0 -1 b, Level 1 b-2 and user calibration tool The SQWG work is split into three topics – Level 0 -1 studies (Lead SRON) – Level 1 b-2 studies (Lead IUP Bremen, also SQWG prime) – Algorithm Baseline Delivery (Lead DLR-IMF) – All parties contribute to all topics and are teaming up according to needs and expertise Slide 5 IGARSS 2011 > G. Lichtenberg > 28 July 2011

Level 0 -1 b Processing The Level 0 -1 b Processor development cycle is – Calibration algorithm development by SRON and DLR-IMF – Implementation into prototype by DLR-IMF – Verification comparing reference algorithm with implementation – Implementation of operational processor by industry (DJO) – „Factory Acceptance Test“ (FAT) between operational processor and prototype Level 1 b data are freely available from ESA With the freely available scial 1 c tool the user can filter and calibrate data as needed (individual calibrations steps are switchable) Current Version: 7. 04, full re-processing under way Slide 6 IGARSS 2011 > G. Lichtenberg > 28 July 2011

Philosophy: Level 1 b data contain all data necessary to produce calibrated spectra in one file. That implies the tasks – Extract calibration data from Level 0 measurements and store them into Auxiliary Data Files (ADFs) – Process Level 0 data detector, combine them with appropriate calibration data from the ADFs to generate the Level 1 b product In operational processing, the Level 1 b-c step is done during Level 2 processing (same code as scial 1 c tool) Degradation correction factors calculated by IUP Bremen in dedicated S/W and applied in Level 1 b-2 processing for the current version Slide 7 IGARSS 2011 > G. Lichtenberg > 28 July 2011

SCIAMACHY DOME-C Radiance Slide 8 IGARSS 2011 > G. Lichtenberg > 28 July 2011

Monitoring Nadir WLS (IUP Bremen) Slide 9 IGARSS 2011 > G. Lichtenberg > 28 July 2011

Level 0 -1 b Processing – Next Version (V. 8) Mirror scan angle dependent degradation correction (based on heuristic model by SRON) Improvements in radiometric and polarisation calibration (recalculated from on-ground measurements) Implementation of a database for calibration measurements (instead of a collection of ADFs) for better traceability, monitoring and maintenance Further improvements for e. g. detector related corrections Delivery of new prototype 2012 Slide 10 IGARSS 2011 > G. Lichtenberg > 28 July 2011

Level 1 b – 2 Processing Operationally, SCIAMACHY provides the following products – Total columns of trace gases from UV/VIS to SWIR – Profiles of trace gases – Cloud information from Nadir measurements – Height resolved cloud information from Limb measurements – Aerosol Index Information Scientific products from various institutions provide (amongst others) – Greenhouse gas information – Trace gases from occultation measurements of the sun – Tropospheric trace gas columns – Additional cloud and aersol parameters Slide 11 IGARSS 2011 > G. Lichtenberg > 28 July 2011

Level 1 b-2 Processing – Processor Development Algorithms are developed by BIRA, DLR-IMF, IUP-Bremen, KNMI All algorithms are integrated into operational processor by DLRIMF. The development cycle is – Implementation as new algorithm becomes ready – Verification of individual algorithms and “regression test” for unchanged algorithms – For new operational version: Freeze of algorithms and testing of all products with new Level 1 b version (if any) – Direct implementation of prototype into operational ground segment – FAT to check if prototype and processor in operational envirnment give the same result Validation of V 5. 01 showed deficiencies in SO 2 and CO VCDs New Version 5. 02 was fast tracked and re-processing is currently prepared to provide optimal products for the whole mission Slide 12 IGARSS 2011 > G. Lichtenberg > 28 July 2011

Level 1 b-2 Processing – Operational Products Slide 13 IGARSS 2011 > G. Lichtenberg > 28 July 2011

Level 1 b-2 Processing – Scientific Institute Slide 14 IGARSS 2011 > G. Lichtenberg > 28 July 2011

Level 2 Example – Cloud Fraction Slide 15 IGARSS 2011 > G. Lichtenberg > 28 July 2011

Level 2 Example – Br. O Total Column Slide 16 IGARSS 2011 > G. Lichtenberg > 28 July 2011

Level 2 Example Limb NO 2 Profile Comparison Slide 17 IGARSS 2011 > G. Lichtenberg > 28 July 2011

Level 3 CO Total Column Monthly Mean Feb 2004 Slide 18 IGARSS 2011 > G. Lichtenberg > 28 July 2011

Summary SCIAMACHY is providing data since 2002 for UV/VIS and SWIR It is the only instrument providing Nadir and Limb data Level 0 -2 processing is continously improved Via the SQWG new scientific algorithms are made ready and implemented into the operational processing chian Instrument in good health, currently mission is funded until end 2013 Slide 19 IGARSS 2011 > G. Lichtenberg > 28 July 2011

Pointers to information SCIAMACHY – Book from Springer SCIAMACHY Products (operational & scientific): www. sciamachy. org Algorithm Documentation (Level 1 b, Level 2): atmos. caf. dlr. de/sciamachy/ Under Preparation: Up-to-date plots of operational products @ atmos. caf. dlr. de/sciamachy/ Slide 20 IGARSS 2011 > G. Lichtenberg > 28 July 2011

Additional slides Slide 21 IGARSS 2011 > G. Lichtenberg > 28 July 2011

Verification scheme Level 1 b-2 Slide 22 IGARSS 2011 > G. Lichtenberg > 28 July 2011

SCIAMACHY derived Level 3 x. CO Slide 23 IGARSS 2011 > G. Lichtenberg > 28 July 2011