GCOS Reference Upper-Air Network
The climate reference network
The Global Climate Observing System (GCOS) Reference Upper-Air Network (GRUAN) is an international reference observing network, designed to fill an important gap in the current global observing system. GRUAN measurements will provide long-term, high-quality climate data records from the surface, through the troposphere, and into the stratosphere. These will be used to determine trends, constrain and calibrate data from more spatially‐comprehensive observing systems (including satellites and current radiosonde networks), and provide appropriate data for studying atmospheric processes. GRUAN is envisaged as a global network of eventually 30-40 sites that, to the extent possible, builds on existing observational networks and capabilities.
GRUAN promotional video
This video provides an excellent overview of the goals and principles of GRUAN and its relation to the current challenges in climate research. You can find this and other public outreach material here.
Important Changes of Radiosounding in GRUAN
Recently, various GRUAN sites have changed their system used for daily operational radiosoundings.
9th GRUAN Implementation-Coordination Meeting (ICM-9)
GRUAN’s 9th Implementation and Coordination Meeting (ICM-9) will be held 12-16 June 2017 in the FMI headquarters in Helsinki, Finland.
AMT paper Calbet et al. 2016 in review
The GRUAN-related paper at AMT is now accessible and open for interactive public discussion until 29 December 2016 with title "Consistency between...
GSICS Quarterly Newsletter article Tradowsky et al. 2016 published
GRUAN-related article published at GSICS Quarterly Newsletter Volume 10, No. 2, 2016 with the title "GRUAN in the service of GSICS: Using reference...
Status of GRUAN stations
GRUAN is envisaged as a global network of eventually 30-40 measurement sites. To the extent possible, it builds on existing observational networks and capabilities. At the end of 2016, GRUAN comprises of 22 stations, 9 of which have passed the GRUAN certification process.
Status of data flow
A comprehensive volume of measurement data has been collected by GRUAN since about 9 years. The archive includes raw data and related meta-data. For the Vaisala RS92 radiosonde, the first GRUAN data product (GDP) is fully implemented and available since 2012. Further data products (GDP) are under development.