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GRUAN logo GRUAN cascade of networksGCOS Cascade of upper-air networks

GCOS Reference Upper-Air Network (GRUAN)

GCOS is establishing a reference network for upper-air climate observations (GRUAN).

GRUAN is expected to provide long-term, highly accurate measurements of the atmospheric profile, complemented by ground-based state of the art instrumentation, to constrain and calibrate data from more spatially-comprehensive global observing systems (inc. satellites and current radiosonde networks), in order to fully characterize the properties of the atmospheric column and their changes.

GRUAN is envisaged as a network of 30-40 high-quality, long-term, upper-air observing stations, building on existing observational networks, such as NDACC, ARM, GUAN, GAW, BSRN and GSN. GRUAN builds on, but is not confined to, the larger GCOS Upper Air Network (GUAN).

In 2007, the GRUAN Lead Centre has been assigned to the Richard-Assmann-Observatory at Lindenberg, Germany. The GRUAN Lead Centre is responsible for the coordination among stations, including training, education and research, and ensuring the archival and dissemination of GRUAN Data.

For further information, visit the official GRUAN Website, maintained by the GRUAN Lead Centre.

GRUAN outreach material

GRUAN organising chart

GRUAN measurement sites

Workin Group on GRUAN


GRUAN-related documents