Summary

Bromine explosion events that occur over first year sea ice in the polar spring cause mercury deposition and dramatically alter the oxidative capacity of the polar boundary layer. Atmospheric chemical measurements made during the Sea Ice Physics and Ecosystems eXperiment (SIPEX II), a multidisciplinary science voyage of the RV Aurora Australis during the polar spring of 2012 are presented here. Targeted with a UV-Vis Multi-AXis Differential Optical Absorption Spectrometer (MAX-DOAS) were vertical BrO, NO2, HCHO profile concentrations. These were combined with in situ halocarbon (i.e. CH2CH2, CHBr3) observations made using a GC-ECD micro-Dirac, gaseous elemental mercury (GEM) observations made using a Tekran instrument, in-situ ozone and aerosol new particle observations. In addition, snow-sea-ice and ocean samples were made at several 'ice stations' between 62- 65°S and 115-121°E to analyze for total mercury and methylmercury. Several GEM depletion events were observed. This suite of observations provides the most complete suite of observations to date to improve our understanding of the implications of BrO explosion events in the Antarctic.

Authors:Schofield R. Humphries R. Gionfriddo C. Kreher K. Johnston P. Harris N. Robinson A. Gordon A. Tate M. Krabbenhoft D. Moreau J. Molloy S. Galbally I. Keywood M. Wilson S. Alexander S.P. Klekociuk A.R. Bowie A. Lannuzel D. Meiners K. Published in: 2013 Category 3: Verbal presentation Program area: Climate Processes and Change
Read publication at daca-13.org
Schofield R., Humphries R., Gionfriddo C., Kreher K., Johnston P., Harris N., Robinson A., Gordon A., Tate M., Krabbenhoft D., Moreau J., Molloy S., Galbally I., Keywood M., Wilson S., Alexander S.P., Klekociuk A.R., Bowie A., Lannuzel D., Meiners K. (2013) Atmospheric chemistry measurements over the East Antarctic during the SIPEX II cruise in polar spring 2012, Davos Atmosphere and Cryosphere Assembly 2013, Davos, Switzerland, 8-12 July 2013 .; http://www.daca-13.org/index_EN;

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Bromine control of the mercury flux into the biosphere of the Southern Ocean and Antarctic regions SCHOFIELD, Dr Robyn Marine Science, Australia (or home country)
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