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EUMETSAT GPRC Report

EUMETSAT GPRC Report. Tim Hewison, Marianne Koenig, Sebastien Wagner, Rob Roebeling, Peter Miu, Jörg Schulz, Harald Rothfuss EUMETSAT. Overview. Satellite Status GEO-LEO IR Products for current Meteosats using IASI GEO Solar-band Channels for current Meteosats

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EUMETSAT GPRC Report

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  1. EUMETSAT GPRC Report Tim Hewison, Marianne Koenig, Sebastien Wagner, Rob Roebeling, Peter Miu, Jörg Schulz, Harald Rothfuss EUMETSAT

  2. Overview • Satellite Status • GEO-LEO IR Products for current Meteosats using IASI • GEO Solar-band Channels for current Meteosats • Re-calibration of Meteosat archive data • Other

  3. EUMETSAT space segment – current planning YEAR... 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 METEOSAT FIRST GENERATION METEOSAT-6 METEOSAT-7 METEOSAT SECOND GENERATION METEOSAT-8 METEOSAT-9 METEOSAT-10 METEOSAT-11 METEOSAT THIRD GENERATION MTG-l-1 MTG-S-1 MTG-l-2 MTG-l-3 MTG-S-2 MTG-l-4 EUMETSAT POLAR SYSTEM (EPS) METOP-A METOP-B METOP-C EPS SECOND GENERATION OCEAN SURFACE TOPOGRAPHY MISSION JASON-2 JASON-3 JASON CONTINUITY OF SERVICES (CS) THIRD-PARTY PROGRAMMES GMES SENTINEL-3 GMES SENTINEL-4 ON MTG GMES SENTINEL-5 ON EPS SECOND GENERATION

  4. Operations – Satellites Status • Operational status of the geostationary and LEO systems is stable: • Meteosat-7 at 57.5° E is servicing the IODC (Indian Ocean Data Coverage) Mission • Meteosat-8 (MSG-1) is located to 9.5° East and performs the operational rapid scanning service. • Meteosat-9 (MSG-2) provides primary service at 0°. • Metop A Low Earth Polar Orbit System performance is stable and all instruments are in an operational state. • Jason 2 Low Earth Inclined Orbit System service for Near Real Time products has confirmed to be stable. MSG-3 and

  5. Summary of planned Launches • 2012-06-19 MSG-3 • 2012-07 Metop-B • 2013: GMES Sentinel 3 A (ESA) • 2014: Jason 3 • 2015: MSG-4 • 2016-2017: Metop-C • 2017: GMES Sentinel 3B (ESA) • 2018: 1st MTG-I • 2017: 1stJason CS (after Jason 3) • 2019: 1st MTG-S (with GMES Sentinel 4 Instrument) • 2019: 1stEPS-SG Satellite ready for launch (VII, IRS, MWS, S5, etc) • 2021: 2nd EPS-SG Satellite mission ready for launch (ASCAT, MWI) • 2022: 2nd MTG-I

  6. Operational Support for Forthcoming Launches • Support commissioning of Meteosat-10 (MSG3) • by running prototype inter-calibration wrt Metop-A/IASI • Validate potential variations to official SRF • Perform SEVIRI Solar Channel Calibration & analyse • Monitor Metop-A/IASI and Metop-B/IASI • by double-differencing against Meteosat/SEVIRI • also applicable to Metop-A/HIRS and Metop-B/HIRS • Starting planning inter-calibration activities for Sentinel-3 • SLSTR – Sea and Land Surface Temperature Radiometer • OLCI - Ocean and Land Colour Instrument

  7. Sentinel-3: Continuity of ENVISAT Ocean Observation Microwave Radiometer Ocean and Land Colour Instrument Sea and Land Surface Temperature Radiometer X-band Antenna DORIS Antenna Laser retro-reflector SAR Radar Altimeter S-band Antenna • Launch Expected end 2013 • Operated by EUMETSAT for GMES (EU programme) • EUMETSAT plan inter-comparison activities: • cal/val, performance monitoring, inter-calibration • following GSICS principles and methodologies • SLSTR IR: • IR comparison with IASI • Currently studying SNO v Statistical method • NWP also possible • OCLI + SLSTR Solar: • Compare with LEO instruments (MODIS, VIIRS, …) • Combination of invariant targets • and Direct ray-matching methods • Also compare with GEOs • – potential reference instruments! GPS Slide courtesy of Craig Donlon (ESA)

  8. Overview • Satellite Status • GEO-LEO IR Products for current Meteosats using IASI • GEO Solar-band Channels for current Meteosats • Re-calibration of Meteosat archive data • Other

  9. GSICS Activities at EUMETSAT • GEO-LEO IR Products for current Meteosats using IASI: • GSICS Corrections – revised netCDF convention • GSICS Bias Monitoring – Developing new web-based Tool • Uncertainty Analysis – manuscript submitted for special issue • Ice Contamination – manuscript submitted for special issue • GEO Solar-band Channels for current Meteosats: • Review of SEVIRI Solar Channel Calibration System • Implementation of GSICS DCC inter-calibration v MODIS • Development of Lunar Calibration method • Evaluating methods to re-calibrate Meteosat archive data: • Using multiple NOAA/Metop/HIRS as reference • Instrument Event Logs – covered under agenda item 8.2

  10. IR Products for current Meteosats using IASI • GSICS Corrections • Near-Real-Time and Re-Analysis Corrections updated daily since 2008 • Published in netCDF format on GSICS Data and Products Server • Now in Demonstration mode, based on prototype code • Pre-Operational candidate, based on Operational code • – but unresolved differences • GSICS Bias Monitoring • Prototype static plots published on web pages since 2008 • Developed interactive tool to generate plots directly from netCDF files • Uncertainty Analysis • Published for each Correction • Ice Contamination Model • Developed to explain trend in bias of IR13.4 channel

  11. Example of New Bias Monitoring Tool Reads data directly in netCDF format from GSICS Servers EUMETSAT Development Prototype: http://10.11.15.74/GSICSCalPlotter/

  12. Overview • Satellite Status • GEO-LEO IR Products for current Meteosats using IASI • GEO Solar-band Channels for current Meteosats • Re-calibration of Meteosat archive data • Other

  13. Meteosat Solar Band Calibration Activities Vicarious calibration using desert targets + sea targets (current official calibration)  SEVIRI Solar Channel Calibration System (presented in Daejeon, 2011) Lunar Calibration  Collaboration with USGS • METEOSAT imagers • MVIRI (Meteosat First Generation) • SEVIRI (Meteosat Second Generation) • FCI (Meteosat Third Generation) Inter-calibration with MODIS using Deep Convective Clouds  Implementation of the GSICS ATBD (Doelling, 2011) Preparation to MSG3 launch + reprocessing activities

  14. SEVIRI Solar Channel Calibration System • Uncertainty analysis on the Radiative Transfer Model (defined as our calibration reference): • Atmospheric gaseous composition • Geometry (geo-location) • Aerosol load • Surface properties • Biggest source of uncertainties: surface properties + aerosols (no surprise but quantified). • (Presented at EUMETSAT Conference, Sept 2011) • Future work: • Assessment of the current system uncertainties to be continued • Re-assessment of the desert target stability + definition of new targets with associated BRF • Improvement of the RTM • Re-evaluation of the reference against reference instruments • Implementation of additional methods such as DCC or homogeneous water clouds (in particular for MTG-FCI non-window channels)  = 1%  = 2%  = 100% (Ref = 0.1)  = 30%  = 20%  = 1%  = 2%  = 100% (Ref = 0.1)  = 30%  = 20%

  15. Meteosat Solar Band Calibration using Lunar Observations • Meteosat SEVIRI: • Lunar observations available in the 4 image corners • More than 100 potential observations / year • Achievements: • Development of an automatic extraction tool for lunar observations for LRES channels • Creation of a database of lunar observations with MSG1 and MSG2 • Collaboration with USGS  proof of concept: inter-band calibration using the ROLO model as a reference works ! (~1% relative error) • Future work: • Consolidation of the extraction tool for RSS data and HRVIS • Consolidation of the existing database of lunar observations (MSG1 / MSG2) • Assessment of lunar calibration capacities with MFG-MVIRI sensor • Operational extraction of the SEVIRI lunar observations • Development of a tailored version of the ROLO model in order to perform operationally lunar calibration (MSG / MTG) SEVIRI Level 1.0 image (forward and backward scan)

  16. Preliminary results for SEVIRI onboard Meteosat-8 and -9 SEVIRI – Meteosat 8 SEVIRI – Meteosat 9 Note: End at the end of 2005 after the start of Rapid Scan Service Courtesy T. Stone, USGS To be presented in IGARSS Munich 2012 Results to be used only for inter-band calibration and drift monitoring Lunar calibration method and instrument are stable. SD <1% - consistent with expected performance of ROLO  BUT is it affected by seasonality? Relative difference between channels = consistent with current findings in terms of absolute calibration.

  17. Inter-calibration against MODIS/Aqua using DCCs • Implementation still on-going • Process for checking-in MODIS + SEVIRI images in place • Thresholding to extract DCCs in place for MODIS + SEVIRI • Ray-matching to establish bias between MODIS and SEVIRI BT missing (BUT numbers provided by D. Doelling) • Spectral transformation of the data missing (BUT numbers for the spectral adjustment provided by D. Doelling) • Angular transformation of the data ( use of an Angular Distribution Model) missing • PDF transformation of data in place • Gain derivation on a monthly basis in place (in radiance, using modal approach) • Uncertainty analysis to associate an uncertainty estimate to the derived gain missing Current difficulties: data storage for MODIS + GEO data  no monitoring system in place yet Test on the view zenith angle MODIS (scan N and N+1) MODIS (scan N+1) SEVIRI MODIS 13:00 SEVIRI – 12:57 FINAL DCCs for both MODIS Aqua and SEVIRI (Met 9)

  18. Overview • Satellite Status • GEO-LEO IR Products for current Meteosats using IASI • GEO Solar-band Channels for current Meteosats • Re-calibration of Meteosat archive data • Other

  19. HIRS Data – Objectives Prerequisites and Benefits • Objective: • To recalibrate time-series Meteosat First Generation and Meteosat Second Generation infrared radiances from 1982 till date using a superior instrument as reference. • Prerequisites: • Inter-calibration back to 1982 • Target accuracy over the time-series better than 1 K • Inter-calibration with uncertainty estimate • Method • Select reference instrument • Assess the uncertainties through systematic review of spectral conversion functions • Define the inter-calibration approach • Reprocess and validate the Data processing and verification

  20. METEOSAT 1984-2005 Archive evaluation using radiosondes MET4 MET6 METEOSAT2 METEOSAT4 METEOSAT5 METEOSAT7 MET3 MET3 Upgrade of calibration technique (van de Berg, et al., 95) Upgrade of calibration technique (Schmetz, 1989) ISCCP DX Normalized Instead of nominal Comparisons between the METEOSAT BTs and the simulated BTs from radoisoundings: (+) represent the raw data, (◊) represent the homogeneised data. The histogram shows the nb of soundings used for comparison. Can we do better than that and extend to SEVIRI? Courtesy of Helene Brogniez and Rémy Roca, LMD

  21. Traditional inter-calibration approach Slide: 23

  22. Proposed GSICS inter-calibration approach • Delta Correction to transfer from one reference to another • Defined as differences between inter-calibration functions • Defined in channel-space of monitored instrument • No need for direct comparisons of references Delta Slide: 24

  23. Proposed GSICS inter-calibration approach Delta time steps inserted for illustration only In practice, deltas defined from simultaneous double-differences Delta Slide: 25

  24. Overview • Satellite Status • GEO-LEO IR Products for current Meteosats using IASI • GEO Solar-band Channels for current Meteosats • Re-calibration of Meteosat archive data • Other

  25. Update on Actions • GRWG06_17: Find out time overlaps between geostationary satellites (commissioning and operational periods), find out about the availability of such data and publish this information on the GSICIS Wiki • EUMETSAT have generated an Excel file, presenting on a daily basis the availability of the Meteosat satellite data in COM or OPE mode from the Data Centre. It includes a rudimentary chart, which we plan to improve in the future ,e.g. provide on web site, add zooming capability, select / deselect

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