The Global Climate Observing System (GCOS) Reference Upper-Air Network (GRUAN) is an international reference observing network of sites measuring essential climate variables above Earth's surface, designed to fill an important gap in the current global observing system. GRUAN measurements are providing long-term, high-quality climate data records from the surface, through the troposphere, and into the stratosphere. These are being 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.
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.
GRUAN Technical Note 8 (GRUAN-TN-8) published with title "GRUAN Monitor MW41 and the Vaisala RS41 Additional Sensor Interface"
We proudly announce the new GRUAN website.
Recently, various GRUAN sites have changed their system used for daily operational radiosoundings.
GRUAN’s 9th Implementation and Coordination Meeting (ICM-9) will be held 12-16 June 2017 in the FMI headquarters in Helsinki, Finland.
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. As at the end of 2016, GRUAN comprises of 22 sites, 9 of which have been GRUAN certified.