Strengthening Meteorological Observations Reference Standards

Strengthening Meteorological Observations Reference Standards



1 April 2010

Today, WMO became a signatory of the Mutual Recognition Arrangement (MRA) of the International Committee for Weights and Measures (CIPM). The objective of the MRA is to establish the degree of equivalence of national measurement standards, to provide for the mutual recognition of calibration and measurement certificates and thereby to provide government and other parties with a secure technical foundation for wider agreements related to international trade, commerce and regulatory affairs. This is of paramount importance to ensuring the traceability of worldwide measurements to international standards and quality of observations, which is crucial to assess, among other, climate change. Indeed all measurement made at different location and different time needs to be comparable. Some laboratories are hosting world-reference standards for WMO, such as for solar irradiance, surface ozone, carbon dioxide, methane, nitrous oxide, sulphur hexafluoride and carbon monoxide concentrations. All measurements need to be linked to these standards to ensure they are comparable.  Signature of the MRA by WMO allows WMO to designate laboratories, which will now also be recognized by the international metrology community and will allow them to participate in CIPM activities, which aim at ensuring world-wide measurement traceability.

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