<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "Tropospheric BrO plumes in Arctic\r\nspring – A comparison of TROPOMI satellite\r\nobservations and model results"^^ . "Halogen radicals can drastically alter the polar atmospheric chemistry. This is made evident by a recurrent destruction of boundary layer ozone during polar springs called ozone depletion events (ODEs).\r\nODEs are caused by enhanced concentrations of reactive halogens, in particular bromine monoxide\r\n(BrO) radicals. Measurements suggest that there are two distinct sets of environmental conditions\r\nfavoring the emissions of bromine to the atmosphere, namely cold and stable meteorological conditions\r\non one side and less stable conditions associated with low-pressure systems on the other. This thesis\r\ninvestigates the importance of these differing environmental conditions on a pan-Arctic scale by comparing TROPOMI satellite observations of BrO with the results of an meterology model coupled with\r\natmospheric chemistry (WRF-CHEM) for the Arctic spring of 2019. For the retrieval of tropospheric\r\nBrO from satellite measurements an algorithm is developed which allows to assess the tropospheric\r\npartial column without reliance on external input. Compared to other retrieval algorithms, it enables\r\nthe full utilization of TROPOMI’s high spatial resolution (7 × 3.5 km²) while also avoiding biases from\r\nthe use of model data.\r\nSatellite observations are used to validate model assumptions. It was demonstrated that a bromine\r\nrelease mechanism from the snow-pack employed in numerous models is unfit to predict ODEs in early\r\nFebruary at high solar zenith angles. Case studies demonstrated that the observed spatial patterns and\r\nlarge BrO columns observed during late polar spring in association with polar cyclones can be explained\r\nby the intrusion of bromine into the free troposphere. It was shown that the magnitude of bromine\r\nemissions from blowing snow in polar cyclones is likely overestimated. A seasonal dependence in the\r\nenvironmental conditions favoring bromine release was established. Calm meteorological conditions\r\nfavor the occurrence of ODEs during early polar spring. During late March and April, ozone was\r\nidentified as limiting factor for BrO formation and results indicated high wind speeds as favorable\r\nmeteorological parameter for bromine release. A statistical analysis of spatial extent and shape of\r\nODEs was conducted, showing a scale of 40 km to 1000 km for bromine enhanced air masses."^^ . "2023" . . . . . . . "Moritz"^^ . "Schöne"^^ . "Moritz Schöne"^^ . . . . . . "Tropospheric BrO plumes in Arctic\r\nspring – A comparison of TROPOMI satellite\r\nobservations and model results (PDF)"^^ . . . "Schoene_HGSFP.pdf"^^ . . . "Tropospheric BrO plumes in Arctic\r\nspring – A comparison of TROPOMI satellite\r\nobservations and model results (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "Tropospheric BrO plumes in Arctic\r\nspring – A comparison of TROPOMI satellite\r\nobservations and model results (Other)"^^ . . . . . . "preview.jpg"^^ . . . "Tropospheric BrO plumes in Arctic\r\nspring – A comparison of TROPOMI satellite\r\nobservations and model results (Other)"^^ . . . . . . "medium.jpg"^^ . . . "Tropospheric BrO plumes in Arctic\r\nspring – A comparison of TROPOMI satellite\r\nobservations and model results (Other)"^^ . . . . . . "small.jpg"^^ . . . "Tropospheric BrO plumes in Arctic\r\nspring – A comparison of TROPOMI satellite\r\nobservations and model results (Other)"^^ . . . . . . "indexcodes.txt"^^ . . "HTML Summary of #32838 \n\nTropospheric BrO plumes in Arctic \nspring – A comparison of TROPOMI satellite \nobservations and model results\n\n" . "text/html" . . . "530 Physik"@de . "530 Physics"@en . .