Title Iodine monoxide in the Antarctic snowpack
Author Friess, U.; Deutschmann, T.; Gilfedder, B.S.; Weller, R.; Platt, U.
Author Affil Friess, U., Ruprecht-Karls- Universität Heidelberg, Institut für Umweltphysik, Heidelberg, Germany. Other: Technische Universität Braunschweig, Germany; Alfred Wegener Institut für Polar- und Meeresforschung, Germany
Source Atmospheric Chemistry and Physics, 10(5), p.2439-2456, . Publisher: Copernicus, Katlenburg-Lindau, International. ISSN: 1680- 7316
Publication Date 2010
Notes In English. Published in Atmospheric Chemistry and Physics Discussions: 26 November 2009, http://www.atmos-chem-phys- discuss.net/9/25361/2009/acpd-9-25361- 2009.html ; accessed in May, 2011. 81 refs. Ant. Acc. No: 91460. GeoRef Acc. No: 310089
Index Terms atmospheric boundary layer; boundary layer; diurnal variations; gases; geochemistry; ozone; snow; statistical analysis; microelement content; water; Antarctica; atmosphere; chlorine dioxide; coastal environment; enrichment; gaseous phase; halogens; iodine; iodine monoxide; Monte Carlo analysis; Neumayer Station; nitrogen dioxide; photochemistry; pore water; snowpack; trace elements
Abstract Recent ground-based and space borne observations suggest the presence of significant amounts of iodine monoxide in the boundary layer of Antarctica, which are expected to have an impact on the ozone budget and might contribute to the formation of new airborne particles. So far, the source of these iodine radicals has been unknown. This paper presents long-term measurements of iodine monoxide at the German Antarctic research station Neumayer, which indicate that high IO concentrations in the order of 50 ppb are present in the snow interstitial air. The measurements have been performed using multi-axis differential optical absorption spectroscopy (MAX-DOAS). Using a coupled atmosphere - snowpack radiative transfer model, the comparison of the signals observed from scattered skylight and from light reflected by the snowpack yields several ppb of iodine monoxide in the upper layers of the sunlit snowpack throughout the year. Snow pit samples from Neumayer Station contain up to 700 ng/l of total iodine, representing a sufficient reservoir for these extraordinarily high IO concentrations.
URL http://www.atmos-chem-phys.net/10/2439/2010/acp-10-2439-2010.pdf
Publication Type journal article
Record ID 65006764