Instrument characterisation and calibration.
The activities undertaken by this group provide one of the keys to the core Action goal of achieving consistency of all Brewer data products across Europe. A first step in ensuring consistency is to set standards for observational quality. Individual instruments must therefore be characterised to establish how component characteristics, e.g. slit function, dispersion coefficients, linearity, spectral responsivity, temperature dependence, stray light, field of view, angular response, etc., uniquely affect measurement outcomes and how potential errors may be avoided or corrected for.
In addition, measurement accuracy is ultimately dependent on regular and accurate calibration. Methodologies which ensure the best transfer of calibration constants and traceability to the reference laboratories (the RBCC-E triad for total ozone, WUVCC and the Quality Assurance of solar Spectral Ultraviolet irradiance Measurements carried out in Europe (QASUME) for the UV measurements) will be developed. Regular comparison with the Canadian triad will also be maintained to ensure global compatibility of TOC measurements.
A workshop will be organized to review the current situation and the existing practices, methodologies and application of characterisations with reference to calibration requirements and how final data products are affected, and so identify the areas where solutions must be sought. In a later phase of the Action, a second, mid-term workshop will assess progress, unforeseen emerging issues, and the effects of the developed methodologies. These workshops will be organised in conjunction with WG 2.
Tasks
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To assess the potential for internal Brewer components to affect the accuracy of the measured values of TOC, Umkehr ozone profiles, spectral UV and AOD-UV.
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To develop methodologies to quantify the effects of the identified component imperfections.
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To develop or modify existing algorithms where possible in order to correct for resulting measurement effects.
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To review current calibration procedures with emphasis on optimising transfer of parameters for all data products and to develop methodologies for best practice, maintaining compatibility between the Toronto and RBCC-E triads.
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To evaluate the potential for and the means of applying the harmonised calibration and characterisation developments to historical data of ozone and AOD-UV.
Deliverables
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Standard modifications to instrument operations and algorithms to correct for individual instrument characteristics.
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A standard set of calibration procedures.
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Protocols for the application of calibration data.
Milestones
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Workshop on the current situation, characterisation and calibration issues.
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Workshop on solutions to instrument characterisation and calibration methodologies.
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Demonstration of application of corrections to historical data where possible.
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Peer reviewed papers.
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