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Enhanced production of atmospheric iodine in Antarctica

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Title
Enhanced production of atmospheric iodine in Antarctica
Authors
Kim, Kitae
Yoon, Ho Il
Choi, Wonyong
Subject
International Symposium on Polar Sciences; King George Island
Issue Date
2014
Citation
Kim, Kitae, Ho-Il Yoon, and Wonyong Choi. 2014. Enhanced production of atmospheric iodine in Antarctica. The 20th International Symposium on Polar Sciences, KOPRI, Incheon, Korea, May 27-29, 2014.
Abstract
Halogen compounds play a significant role in Earth’s environments. Reactive halogens are involed in ozone depletion event both in Troposphere and Stratosphere, perturbation of HOx/NOx cycle, formation of cloud condensation nuclei(CCN), and mercury depletion event. Although the high concentration of atmospheric iodine compounds in the boundary layer of Antarctica was observed by ground-based and satellite borne observation, the mechanisms and sources are not well understood. In this work, the oxidation of iodide and subsequent release of atmospheric iodine both in the presence and absence of irradiation was investigated. The oxidation of iodide (I-) to tri-iodide (I3-) and the following production of iodine molecule (I2) were greatly enhanced in ice phase compared to those in aqueous solution. The outdoor experiments conducted under ambient environments of the Antarctic region (King George Island, 62°13′S 58°47′W, sea level) also sconfirmed the enhanced oxidation of iodide in ice phase. The freeze concentration of iodide, proton, and oxygen in ice grain boundaries is regareded as the major driving force for the enhanced oxidation of iodide and the following production of iodine molecule in atmosphere. These results suggest the unknown production pathway of the atmospheric iodine compounds in fronzen environments.
Conference Name
The 20th International Symposium on Polar Sciences
Conference Place
KOPRI, Incheon,
Conference Date
2014.05.27.-29.
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