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The ground-based microwave radiometer MIAWARA-C recorded the upperstratospheric and lower mesospheric water vapour distribution continuouslyfrom June 2011 to March 2013 above the Arctic station of Sodankylä, Finland(67.4° N, 26.6° E) without major interruptions and offerswater vapour profiles with temporal resolution of 1 h for averageconditions. The water vapour time series of MIAWARA-C shows strong periodicvariations in both summer and winter related to the quasi-2-day wave.Above 0.1 hPa the amplitudes are strongest in summer. The stratosphericwintertime 2-day wave is pronounced for both winters on altitudes below0.1 hPa and reaches a maximum amplitude of 0.8 ppmv in November 2011. Overthe measurement period, the instrument monitored the changes in water vapourlinked to two sudden stratospheric warmings in early 2012 and 2013. Based onthe water vapour measurements, the descent rate in the vortex after thewarmings is 364 m d<sup>−1</sup> for 2012 and 315 m d<sup>−1</sup> for 2013

Signatures of the 2-day wave and sudden stratospheric warmings in Arctic water vapour observed by ground-based microwave radiometry