Second Infrared Radiometer Workshop Report to WGCV18

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Second Infrared Radiometer Workshop - Report to
WGCV-18

• Presentation to CEOS WGCV-18
• ESA/ESRIN, Frascati, Italy
• 5-7 June 2001
• Ian Barton
• CSIRO Marine Research
• Hobart, Tasmania, Australia

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Second Infrared Radiometer Calibration and
Inter-comparison

• RSMAS, University of Miami
• 28 May - 2 June, 2001
• 15 participants
• 7 different radiometers
• 4 black body targets
• Inter-comparison at sea over 2 days

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Major funding agenciesFollowing a WGCV
recommendation to CEOS Plenary funding was made
available by -

• EUMETSAT (initial sponsor)
• NOAA
• ESA

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Secondary funding agencies

• NIST (USA) Provision of NIST standards
• RSMAS, University of Miami
• JPL, NASA, BNL
• APL, University of Washington
• DETR/ RAL UK
• JRC, Europe
• CSIRO, Australia

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Workshop structure

• Laboratory calibration of radiometers against
  NIST standards
• Characterisation of calibration black-body
  targets using new NIST TXR
• At-sea inter-comparison of infrared radiometers
  used for SST validation
• Reporting of preliminary results to funding
  agencies
• Publication of results

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Radiometers operators

• M-AERI RSMAS, Uni. Miami
• SISTeR RAL, UK
• DAR011 CSIRO Australia
• CIRIMS APL, Uni. Washington
• ISAR JRC, Europe
• Everest-based JPL, USA
• TASCO CSIRO, Australia

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Calibration black-bodies

• NIST Black -body standard
• RSMAS NIST-clone
• CASOTS black bodies x 2
• Portable black body (CSIRO)

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Radiometer calibration

• M-AERI and CIRIMS only used in ship
  inter-comparisons
• Other radiometers viewed the NIST and U. Miami
  black body target at a range of temperatures
  between 15 and 40 degrees C.
• Preliminary results show accuracies better than
  0.1 K for each radiometer

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NIST Transfer Radiometer (TXR)

• Operates at LN2 temperatures
• Wavelengths of 5 and 10 microns
• Bandwidth of 1 micron
• Cooled Hg/Cd/Te InSb detectors
• NEDT better than 10 mK at 300K
• Used to characterise the U. Miami and CASOTS BBs

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At-sea inter-comparisons

• Radiometers all fitted to the RV Walton Smith
• Two days at sea between Miami and the Bahamas
• Supporting measurements from ships
  thermosalinograph, radiosondes, in-situ
  thermometers, all-sky camera, and full navigation
  and meteorological data

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