NDACC is a cross-border international research network of remote sounding stations. It is a major contributor to the World Meteorological Organisation (WMO) GAW programme and it works under the auspices of United Nations Environment Programme (UNEP) and the International Ozone Commission (IO3C). At present time it includes more than 70 high-quality, remote-sensing research stations/sites distributed worldwide. Within the MPC VDAF we rely on the NDACC FTIR CO measurement data which provide vertical CO concentration profiles with a limited vertical resolution.
The Total Carbon Column Observing Network (TCCON), established in 2004, is a network of ground- based Fourier Transform Spectrometers that measures column-averaged abundances of atmospheric constituents including CO2, xCH4, N2O, HF, CO, H2O, and HDO. TCCON was included in the Global Atmosphere Watch (GAW) of the WMO in 2009.
NDACC and TCCON sites (status August 2020)