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Stratospheric and middle-mesospheric ozone profiles above Bern, Switzerland\ud(46.95° N, 7.44° E; 577 m) have been\udcontinually measured by the GROMOS (GROund-based Millimeter-wave Ozone\udSpectrometer) microwave radiometer since 1994. GROMOS is part\udof the Network for the Detection of Atmospheric Composition Change\ud(NDACC). A new version of the ozone profile retrievals has been\uddeveloped with the aim of improving the altitude range of retrieval\udprofiles. GROMOS profiles from this new retrieval version have been\udcompared to coincident ozone profiles obtained by the satellite limb\udsounder Aura Microwave Limb Sounder (MLS). The study covers the stratosphere and middle\udmesosphere from 50 to 0.05 hPa (from 21 to 70 km) and\udextends over the period from July 2009 to November 2016, which results\udin more than 2800 coincident profiles available for the comparison. On\udaverage, GROMOS and MLS comparisons show agreement generally over\ud20 % in the lower stratosphere and within 2 % in the\udmiddle and upper stratosphere for both daytime and nighttime, whereas\udin the mesosphere the mean relative difference is below 40 %\udduring the daytime and below 15 % during the nighttime. In addition, we have\udobserved the annual variation in nighttime ozone in the middle\udmesosphere, at 0.05 hPa (70 km), characterized by the\udenhancement of ozone during wintertime for both ground-based and\udspace-based measurements. This behaviour is related to the middle-mesospheric maximum in ozone (MMM)

Comparison of ozone profiles and influences from the tertiary ozone maximum in the night-to-day ratio above Switzerland