The GAW Quality Assurance (QA) system impacts all aspects of atmospheric chemistry observations, including
• training of station personnel;
• assessment of infrastructures, operations and the quality of observations at the sites;
• documentation of data submitted to the WDCs;
• improvement of the quality and documentation of legacy data at the WDCs.
The primary objectives of the GAW QA system are to ensure that the data in the World Data Centres (WDCs) are consistent, of known and adequate quality, supported by comprehensive metadata, and sufficiently complete to describe global atmospheric states with respect to spatial and temporal distribution.
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Five types of Central Facilities dedicated to six groups of measurement variables are operated by WMO Members and form the basis of quality assurance and data archiving for the GAW global monitoring networks. They include Central Calibration Laboratories (CCLs) that host primary standards (PS), Quality Assurance/Science Activity Centres (QA/SACs), World Calibration Centres (WCCs), Regional Calibration Centres (RCCs), and World Data Centres (WDCs) with responsibility for archiving and access to GAW data.
Long-term education, training, workshops, calibrations station audits/visits and twinning are also provided to build capacities in atmospheric sciences in the GAW network. These Capacity building activities are of increased importance as many GAW stations in developing countries have become operational.
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Central Calibration Laboratories (CCLs) in the GAW Programme are assigned for most of the measured parameters. The main tasks of the calibration laboratories is to hosts WMO World Reference Standards and reference scales.
Terms of Reference for GAW Central Calibration Laboratories (CCLs)
All CCLs can be found under "Central Facilities"
QA/SACs are responsible for the development and implementation of the quality assurance (QA) system in the GAW programme for specific atmospheric parameters.
Terms of Reference for GAW Quality Assurance/Science Activity Centres (QA/SACs)
All QA/SACs can be found under "Central Facilities"
GAW calibration centres are either global (WCCs) or regional (RCCs) in responsibility. The centres are operated by institutions participating in the GAW Programme. The main tasks of the calibration centers are to link observations to World Reference Standards and to ensure network comparability/compatibility through intercomparison campaigns and regular audits.
Terms of Reference for World and/or Regional Calibration Centres (WCCs, RCCs)
All WCCs and RCCs can be found under "Central Facilities"
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