This paper presents new atmospheric ozone concentration
profiles retrieved from measurements made with two ground-based millimetre-wave radiometers in Kiruna, Sweden. The instruments are the Kiruna Microwave
Radiometer (KIMRA) and the Millimeter wave Radiometer 2 (MIRA 2). The ozone
concentration profiles are retrieved using an optimal estimation inversion
technique, and they cover an altitude range of ∼ 16–54 km, with
an altitude resolution of, at best, 8 km. The KIMRA and MIRA 2 measurements
are compared to each other, to measurements from balloon-borne ozonesonde
measurements at Sodankylä, Finland, and to measurements made by the
Microwave Limb Sounder (MLS) aboard the Aura satellite. KIMRA has a
correlation of 0.82, but shows a low bias, with respect to the ozonesonde
data, and MIRA 2 shows a smaller magnitude low bias and a 0.98 correlation
coefficient. Both radiometers are in general agreement with each other and
with MLS data, showing high correlation coefficients, but there are
differences between measurements that are not explained by random errors. An
oscillatory bias with a peak of approximately ±1 ppmv is identified
in the KIMRA ozone profiles over an altitude range of ∼ 18–35 km, and is believed to be due to baseline wave features that are
present in the spectra. A time series analysis of KIMRA ozone for winters
2008–2013 shows the existence of a local wintertime minimum in the ozone
profile above Kiruna. The measurements have been ongoing at Kiruna since 2002 and
late 2012 for KIMRA and MIRA 2, respectively
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