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Craig Donlon and Ian Robinson, ESA AO9081 First presented at the ENVISAT validation Workshop, ESA/ESRIN, Italy, December

Craig Donlon and Ian Robinson, ESA AO9081 First presented at the ENVISAT validation Workshop, ESA/ESRIN, Italy, December, 2002. Outline. Review of validation activities Presentation of results Particular concerns Future validation work into 2003 and beyond Summary. Validation Activities.

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Craig Donlon and Ian Robinson, ESA AO9081 First presented at the ENVISAT validation Workshop, ESA/ESRIN, Italy, December

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  1. Craig Donlon and Ian Robinson, ESA AO9081 First presented at the ENVISAT validation Workshop, ESA/ESRIN, Italy, December, 2002.

  2. Outline • Review of validation activities • Presentation of results • Particular concerns • Future validation work into 2003 and beyond • Summary

  3. Validation Activities • Based on UoL project RP16 060 “AATSR Validation Program” Work package VAL600 (Issue 4, 14/9/01):Key activities are: • Negotiate the deployment of in situ instruments with shipping companies. • Prepare and deploy ISAR radiometers during the post-AATSR SODAP commissioning phase of Envisat. • Collect, process and archive in situ measurements measurements. • Order and analyse AATSR data. • Analyse in situ/satellite SSST co-locations. • Submit processed data to the NILU database. • Provide validation reports to the VS.

  4. Project Structure Data Collection Data analysis Instrumentation C. Donlon (JRC) G. Fisher (SOC) M. Reynolds (BNL) R. Edwards (BNL) T. Nightingale (RAL) Operations G. Fisher (SOC) V. Narzin (BF) R. Collins (SOC) C. Donlon (SOC) Data management E. Mason (SOC) G. Fisher (SOC) C. Donlon (JRC) SOC-LSO data management team Analysis C. Donlon (JRC) E. Mason (SOC) I. Robinson (SOC) Software development and maintenance Liaison with Brittany Ferries ISAR system In situ data and archive Ancillary instruments Installation AATSR data archive and processing AATSR-ship colocation Software maintenance Data logging Software development and maintenance NILU database Software development and maintenance Hardware maintenance Report to VS Calibration Validation loop (VS & DQG) Data collection and backup PIs: C. Donlon (9081) & I. Robinson (9082) CoPIs: M. Reynolds (BNL) & T Nightingale (RAL) Project Manager: G. Fisher

  5. In situ data collection • Data/instrumentation: • ISAR radiometer: SSTskin • SSTdepth sensors: SSTdepth • UK Met Office Ship reports for each ship • 2 “operational” activities in the Bay of Biscay/E. Channel area: • M/V Val de Loire • May 15th - June 26th 2002 • M/V Pride of Bilbao and EU FerryBox project • August 16th 2002 - Present

  6. ISAR radiometer Scandrum View aperture • An autonomous in situ IR radiometer: • Accuracy Specification +/-0.1K rms • Longevity: 3 months at sea unattended • Uses a sensitive rain gauge • Triggers a shutter that seals the system • Dedicated real time data log system

  7. ISAR Installation: Val de Loire ISAR5C Mount bracket shown in place on the bridge wing. ISAR-5C radiometer and ScTi MiniORG rain sensor.

  8. Other Instruments and Data… SBE48 internal hull SST sensor @ 5m depth. Kipp&Zonen CM11 pyranometer Gill Wind-master 3 axis sonic anemometer (u,v,z @ 1 sec) YSI thermistor located in sea chest (x2) @ 5m ISAR-5C also provides: • Position • cmg & smg • Roll/pitch/heave • Precipitation (research) • Master (gps) date/time

  9. ISAR installation: Pride of Bilbao New ISAR mount bracket New Cable run (50m !!) New Rain Gauge mount bracket

  10. SOC FerryBox Experiment • Real-time underway data via Satellite link from • Thermosalinograph and Flourimeter • ISAR will be interfaced to the system in January 2003

  11. AATSR/ATSR-2 Validation indicator • Derived using ISAR sky Brightness Temperatures (BTsky): • Good: clear sky (BTsky <200 K) • Fair: broken cloud (200 K < BTsky < 260 K) • No chance: Cloudy sky (BTsky > 260 K) • local overpass time periods of 09:30–11:30 and 21:30-23:30. • To assess the effort/success: • EffortIndex=N.Val.chances/N.days.Obs

  12. Val de Loire Operations Summary of Potential validation data points: Good: 37(Effort index=1.028) Fair: 42(Effort Index=1.16) None: 29(Effort Index=0.806) May 15th - June 26th 2002

  13. Pride of Bilbao Operations 22-26 October 2002 • No chance: Cloudy sky (BTsky > 260 K) • Effort Index=NaN

  14. AATSR/ATSR-2 & RA-2 data • Started to receive data 4 weeks ago… • No time to process the data yet • No data prior to September 2002 • Work in progress…

  15. Particular concerns • Piloting a new system that will mature as we continue through 2003 • Validation is not a 6 month only experiment • test instrument performance • atmospheric correction strategies • geophysical data accuracy • It is an important (but often overlooked) satellite mission component; an incomplete validation program: • it becomes impossible to demonstrate any independent confidence limits for the geophysical satellite data products. • In the case of satellite SST data sets having accuracies better than 0.3 K the quality of the in situ measurement becomes a critical factor • NILU... • Need an on-going funded validation program for AATSR • Staff shortage… • Operations and equipment calibration/maintenance funding

  16. The Future • Will continue operations on the M/V Pride of Bilbao until funding runs out (mid 2003). • Collaboration with University of Miami under the NOPP • ISAR aboard the Falstaff • Inter-comparisons with other radiometers • More ISAR radiometers are being solicited (UK, India, Japan, USA) • Commercialization in July 2003 • Planned Experiment in June 2003 Aqua-Alta Tower N. Adriatic. • Scatterometers • Visible radiometers • IR radiometers • Effect of sea state on sky corrections

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