Galbally, I. E.

Schultz, Martin

Tarasova, O.

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Geophysical Research AbstractsVol. 15, EGU2013-4720, 2013EGU General Assembly 2013© Author(s) 2013. CC Attribution 3.0 License.Long-term observations of tropospheric ozone: GAWMeasurementGuidelinesOksana Tarasova (1), Ian E. Galbally (2), and Martin G. Schultz (3)(1) WMO, Atmospheric Environment Research Division, Geneva, Switzerland (otarasova@wmo.int), (2) CSIRO Marine andAtmospheric Research, Aspendale, Victoria, Australia, (3) Institute for Energy and Climate Research (IEK-8) - Troposphere,Forschungszentrum Jülich, Jülich, GermanyThe Global Atmosphere Watch (GAW) Programme of the World Meteorological Organization (WMO) coordinateslong-term observations of the chemical composition and physical properties of the atmosphere which are relevantfor understanding of atmospheric chemistry and climate change. Atmospheric observations of reactive gases (tro-pospheric ozone, carbon monoxide, volatile organic compounds and nitrogen oxides) coordinated by the GAWProgramme complement local and regional scale air quality monitoring efforts.As part of the GAW quality assurance (QA) system detailed measurement guidelines for atmospheric trace speciesare developed by international expert teams at irregular intervals. The most recent report focuses on continuous in-situ measurements of ozone in the troposphere, performed in particular at continental or island sites with altitudesranging from sea level to mountain tops. Data Quality Objectives (DQOs) are defined for different applicationsof the data (e.g. trend analysis and verification of global model forecasts). These DQOs include a thorough dis-cussion of the tolerable level of measurement uncertainty and data completeness. The guidelines present the bestpractices and practical arrangements adopted by the GAW Programme in order to enable the GAW station networkto approach or achieve the defined tropospheric ozone DQOs. The document includes information on the selectionof station and measurement locations, required skills and training of staff, recommendations on the measurementtechnique and the necessary equipment to perform highest quality measurements, rules for conducting the mea-surements, preparing the data and archiving them, and more. Much emphasis is given to discussions about how toensure the quality of the data through tracing calibrations back to primary standards, proper calibration and dataanalysis, etc. In the GAW Programme the QA system is implemented through Central Facilities (Central Calibra-tion Laboratories, World and Regional Calibration Centers and World Data Centers), Scientific Advisory Groupsand GAW Training and Education Center. These bodies support primary standards, provide calibration and dataarchiving facilities, coordinate comparison campaigns, perform stations audit, provide documentation and trainingof personnel.

Long-term observations of tropospheric ozone: GAW Measurement Guidelines

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Long-term observations of tropospheric ozone: GAW Measurement Guidelines

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