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The NERC Field Spectroscopy Facility

The NERC Field Spectroscopy Facility. Tim Malthus and Chris MacLellan. Recent history. Pool of field portable spectroradiometers Supporting instruments for atmospheric properties Transferred from Southampton to Edinburgh in 2004 Emphasis on maintaining standards set

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The NERC Field Spectroscopy Facility

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  1. The NERC Field Spectroscopy Facility Tim Malthus and Chris MacLellan

  2. Recent history • Pool of field portable spectroradiometers • Supporting instruments for atmospheric properties • Transferred from Southampton to Edinburgh in 2004 • Emphasis on maintaining standards set • A programme of refurbishment and upgrading of existing equipment • ‘Procedurising’ major functions including QA and calibration • Modifications to the QA/Cal process to improve user confidence • Surveying users

  3. What does cal/val mean to us? • Calibration and traceability • Stability monitoring • Standards (radiance, irradiance, reflectance) • Quality assurance (dark signal, linearity, radiometric and wavelength accuracies) • User reassurance • Role of instruments in ‘MM2’ • The use of FSF equipment in validation of data products from other sources (e.g. NERC ARSF data products)

  4. Benefits of cal/val to FSF • Adds credence to the measurement data • Increases confidence in the accuracy of the data • Improves comparison to historical data sets • Provides a credible comparison to international data • Sets a high standard / benchmark for the field spectroscopy community throughout the UK • Enables the facility to participate in UK laboratory inter-comparison studies • Enhances the reputation of the facility • Encourages others to use the facility

  5. Issues • Cal/Val seen as vitally important to our function • Procedures which ensure rigour in our own practice • Increasing numbers of instruments in the UK, with potentially variable degrees of maintenance and calibration • Awareness-raising and a service role beyond our own users

  6. User survey • Partly to find out: • Use and satisfaction with equipment and quality of it that FSF provides • Degree to which users are increasingly relying on their own instrumentation • The extent to which they undertake their own QA and Cal procedures

  7. User survey results • High level of satisfaction with FSF equipment • ~60% respondents have their own instruments • Field spectroradiometers to Ocean Optics • ~60% of these were calibrated less than once every two years • Considerable interest in • Calibration • QA and calibration

  8. The future… • More extensive survey of UK-based field instrumentation, in conjunction with NCAVEO • Participation in Cal/Val programmes • Accuracy improvment • Establishing measures of equipment performance and limitations • FTIR instrument • Awareness

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