Launched in 2011 within the European Metrology Research Programme (EMRP) of EURAMET, the joint research project "MeteoMet" -Metrology for Meteorology -is the largest EMRP consortium: National Metrology Institutes, Universities, meteorological and climate agencies, Research Institutes, collaborators and manufacturers are working together, developing new metrological techniques, as well as improving already existing ones, for meteorological observations and climate records. The project focuses on: humidity in the upper and surface atmosphere, air temperature, surface and deep-sea temperatures, soil moisture, salinity, permafrost temperature, precipitation and snow albedo effect on air temperature. All tasks are performed under rigorous metrological approach and include design and study of new sensors, new calibration facilities, investigation of sensors characteristics, improved techniques for measurements of Essential Climate Variables with uncertainty evaluation, traceability, laboratory proficiency and inclusion of field influencing parameters, long-lasting measurements, and campaigns in remote and extreme areas. MeteoMet vision is to make a further step towards establishing full data comparability, coherency, consistency and long-term continuity, through a comprehensive evaluation of the measurement uncertainties for the quantities involved in the global climate observing systems and the derived observations. The improvement of quality of Essential Climate Variables records, through the inclusion of measurement uncertainty budgets, will also highlight possible strategies for the reduction of the uncertainty. This contribution presents selected highlights of the MeteoMet project and reviews the main ongoing activities, tasks and deliverables, with a view to its possible future evolution and extended impact.

No abstract

No abstract

The results of a EURAMET key comparison of water triple-point cells (EURAMET.T-K7) are reported. The equipment used, the measuring conditions

In order to assure the quality of dew-point measurements, a bilateral comparison between the National Metrology Institute of Turkey (UME) and the Centre for Metrology and Accreditation (MIKES), Finland, was carried out in 2006. This comparison is registered as EUROMET Project No. 906. Two chilled-mirror hygrometers (MBW 373 and MBW 373H) were used to compare the UME two-pressure humidity generator with the MIKES dew/frost-point generator. An MBW 373 was used in the range from a frost point of −20 • C to a dew point of +20 • C and an MBW 373H in the range from a frost point of −20 • C to a dew point of +60 • C. Dew-point temperature measurements were performed at six dew-point temperatures in the range from a frost point of −20 • C to a dew point of +60 • C at UME and MIKES. According to the results, the mean difference between the laboratories varies from (−0.11 to +0.07) • C over the range. The estimated expanded uncertainty (k = 2) varies from (0.13 to 0.28) • C. A detailed description of the equipment, results and uncertainty analysis is presented in this paper.