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The MIAMI-2001 Radiometer Intercomparison. Peter J. Minnett Rosenstiel School of Marine and Atmospheric Science, University of Miami, Florida, USA Ian J. Barton CSIRO Marine Labs Hobart, Australia Joe P. Rice Optical Technology Division National Institute of Standards and Technology

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the miami 2001 radiometer intercomparison

The MIAMI-2001 Radiometer Intercomparison

Peter J. Minnett

Rosenstiel School of Marine and Atmospheric Science,

University of Miami, Florida, USA

Ian J. Barton

CSIRO Marine Labs

Hobart, Australia

Joe P. Rice

Optical Technology Division

National Institute of Standards and Technology

Gaithersburg, Maryland, USA

ENVISAT Validation Workshop

Frascati, Italy

12 December 2002

overview
Overview
  • Objectives
  • Radiometers
  • Laboratory results
  • Shipboard results
  • Conclusions
miami 2001radiometer intercalibration workshop
Miami-2001Radiometer Intercalibration Workshop.

To calibrate and compare infrared radiometers used in the validation of the different surface temperature products derived from earth observation satellites. These aims included an assessment of the relative performance of each instrument as well as ensuring that surface measurements used in satellite product validation are traceable to SI standard units.

participants
Participants

Dr. Ali Abtahi NASA Jet Propulsion Laboratory, Pasadena, CA, USA

Dr. Ian Barton CSIRO Marine Research, Hobart, Australia

Dr. Jim Butler NASA GSFC, Greenbelt, MD, USA

Dr. Craig Donlon EEC Joint Research Centre, Ispra, Italy

Dr. Marianne Edwards Leicester University, UK

Ms. Ruth Fogelberg Applied Physics Laboratory, U. Washington, Seattle, WA,USA

Ms. Jenny Hanafin RSMAS-MPO, University of Miami, FL, USA

Dr. Simon Hook NASA Jet Propulsion Laboratory, Pasadena, Ca., USA

Dr. Andy Jessup Applied Physics Laboratory, U. Washington, Seattle, WA, USA

Dr. Carol Johnson NIST, Gaithersburg, MD, USA

Ms. Erica Key RSMAS-MPO, University of Miami, FL, USA

Ms. Trina Lichtendorf Applied Physics Laboratory, U. Washington, Seattle, WA, USA

Mr. Kevin Maillet RSMAS-MPO, University of Miami, FL, USA

Dr. Peter Minnett RSMAS-MPO, University of Miami, FL, USA

Dr. Tim Nightingale Rutherford Appleton Laboratory, Chilton, UK.

Dr. Mike Reynolds Brookhaven National Laboratory, USA

Dr. Joe Rice NIST, Gaithersburg, MD,USA

Dr. Goshka Szczodrak RSMAS-MPO, University of Miami, FL, USA

Dr. Brian Ward NOAA, AOML, Miami, FL, USA

Dr. Gary Wick NOAA, ETL, Boulder, CO., USA

instruments
Instruments

Infrared radiometers that participated in the campaign

Black bodies used for laboratory calibration.

radiometer characteristics
Radiometer Characteristics

*The Heitronics uses a chopped pyroelectric detector.

#The ISAR Heitronics is modified to allow the measurement of temperatures down to –100oC.

objectives of laboratory measurements
Objectives of laboratory measurements

To characterize all black-body calibration targets by NIST EOS TXR, leading to an estimate of emissivity of black body cavities as a function of temperature, wavelength (5 and 10µm) and, aperture.

the nist eos txr
The NIST EOS TXR

EOS Standard

Cryogenic detectors (liquid N2)

λ= 5 & 10µm

See:Rice, J. P. and B. C. Johnson, 1998. The NIST EOS Thermal-Infrared Transfer Radiometer., Metrologia, 35, 505-509

nist water bath black body calibration target
NIST water-bath black-body calibration target

See: Fowler, J. B., 1995. A third generation water bath based blackbody source., J. Res. Natl.Inst. Stand. Technol., 100, 591-599

casots black body calibrator
CASOTS black-body calibrator

See: Donlon, C. J., T. Nightingale, L. Fiedler, G. Fisher, D. Baldwin and I. S. Robinson, 1999. The Calibration and Intercalibration of Sea-Going Infrared Radiometer Systems Using a Low Cost Blackbody Cavity, Journal of Atmospheric and Oceanic Technology, 16, 1183–1197

miami 2001radiometer intercalibration workshop24
Miami-2001Radiometer Intercalibration Workshop.
  • Following the radiometer calibration, intercomparison, and testing under field conditions, the international community has increased confidence in the results to be provided for validation of satellite-derived SSTs from the participating instruments.
  • Radiometers work to ~0.1K uncertainty levels in the field
  • Black body calibrators have been characterized with reference to NIST standard
publications in review
Publications, in review
  • Rice, J. P., J. J. Butler, B. C. Johnson, P. J. Minnett, K. A. Maillet, T. J. Nightingale, S. J. Hook, A. Abtahi, C. J. Donlon and I. J. Barton. The Miami2001 Infrared Radiometer Calibration and Intercomparison: 1. Laboratory Characterization of Blackbody Targets, Journal of Atmospheric and Oceanic Technology.
  • Barton, I. J., P. J. Minnett, C. J. Donlon, S. J. Hook, A. T. Jessup, K. A. Maillet and T. J. Nightingale. The Miami2001 infrared radiometer calibration and inter-comparison: 2. Ship comparisons, Journal of Atmospheric and Oceanic Technology.
acknowledgements
Acknowledgements

Acknowledge funding from

  • NOAA-NESDIS
  • ESA
  • Eumetsat
  • Participant’s home institutes and funding agencies

pminnett@rsmas.miami.edu