Geophysical Research Letters · 2005 · 134 citations · 1 references
EngineeringEarth SciencesAtmospheric ScienceInstrumentationMetrologyCalibrationEquipment CalibrationMeasurement ErrorMeasurement StandardsOptical InstrumentationSpectral CalibrationCalibration Of Air Pollution InstrumentsCalibration SourcesCalibration Uncertainty AnalysisInstrument Accuracy AssessmentInstrument Measurement StandardsRandom ErrorsSpectrometer CalibrationWavelength Calibration
It has been more than 20 years since the Brewer reference triad was established by Environment Canada at Toronto. The triad serves as a reference for traveling standard instruments that are used to calibrate Brewer spectrophotometers around the world. The members of the triad are calibrated on a regular basis at Mauna Loa, Hawaii. Regular tests made with an internal quartz halogen lamp make it possible to track the instrument response between the calibrations. A new analysis of available column ozone data records indicates that the uncertainty in the daily values derived from each instrument is approximately 0.6%. The random errors of individual observations are within ±1% for 90% of all measurements. Sources of potential errors in the individual Brewer measurements as well as quality control tools are also discussed.
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