Ground-based millimetre-wave measurements of middle-atmospheric carbon monoxide above Ny-Ålesund (78.9° N, 11.9° E)
We present a new ground-based system for measurements of
middle-atmospheric carbon monoxide (CO) at Ny-Ålesund, Svalbard, and
the altitude profiles of CO volume mixing ratios (VMRs) measured during the
2017/2018 winter. The Carbon Monoxide Radiometer for Atmospheric
Measurements (CORAM) records spectra from CO spectral emissions in the
middle atmosphere with the aid of a low-noise amplifier designed for the
230 GHz spectral region. Altitude profiles of CO VMRs are retrieved from the
measured spectra using an optimal estimation inversion technique. The
profiles in the current dataset have an average altitude range of 47–87 km,
with special consideration to be given to data at
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