the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
A mechanism for biologically-induced iodine emissions from sea-ice
Abstract. Only recently, ground- and satellite-based measurements have reported high concentrations of IO in coastal Antarctica. The sources of such a large iodine burden in the Antarctic atmosphere remain unknown. We propose a novel mechanism for iodine release from sea-ice surfaces. The release is triggered by the biological production of iodide (I-) and hypoiodous acid (HOI) from marine algae, contained within and underneath sea-ice, and their diffusion through sea-ice brine channels to accumulate in the quasi-liquid layer on the surface of sea-ice. A multiphase chemical model of polar atmospheric chemistry has been developed to investigate the biology-ice-atmosphere coupling in the polar environment. Model simulations were conducted to interpret recent observations of elevated IO in the coastal Antarctic springtime. The results show that the levels of inorganic iodine (i.e. I2, IBr, ICl) released from sea-ice through this mechanism account for the observed IO concentrations in the Antarctic springtime environment. The model results also indicate that iodine may trigger the catalytic release of bromine from sea-ice through phase equilibration of IBr. Considering the extent of sea-ice around the Antarctic continent, we suggest that the resulting high levels of iodine may have widespread impact on catalytic ozone destruction and aerosol formation in the Antarctic lower troposphere.
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RC S602: 'major problems with modeling approach', Rolf Sander, 07 Mar 2008
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AC S752: 'Author response to Referee comments', Alfonso Saiz-Lopez, 14 Mar 2008
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RC S989: 'reply', Rolf Sander, 26 Mar 2008
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AC S1508: 'Response to Sander's report', Alfonso Saiz-Lopez, 10 Apr 2008
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AC S1508: 'Response to Sander's report', Alfonso Saiz-Lopez, 10 Apr 2008
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RC S989: 'reply', Rolf Sander, 26 Mar 2008
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AC S752: 'Author response to Referee comments', Alfonso Saiz-Lopez, 14 Mar 2008
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EC S1316: 'some additional questions', Lucy Carpenter, 04 Apr 2008
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AC S1477: 'reply', Alfonso Saiz-Lopez, 09 Apr 2008
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AC S1477: 'reply', Alfonso Saiz-Lopez, 09 Apr 2008
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RC S1447: 'another comment', Rolf Sander, 09 Apr 2008
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AC S1600: 'reply', Alfonso Saiz-Lopez, 12 Apr 2008
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AC S1600: 'reply', Alfonso Saiz-Lopez, 12 Apr 2008
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RC S1518: 'Comment', Anonymous Referee #1, 10 Apr 2008
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AC S1585: 'Response to Referee report', Alfonso Saiz-Lopez, 12 Apr 2008
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AC S1585: 'Response to Referee report', Alfonso Saiz-Lopez, 12 Apr 2008
- Printer-friendly version
- Supplement
-
RC S602: 'major problems with modeling approach', Rolf Sander, 07 Mar 2008
-
AC S752: 'Author response to Referee comments', Alfonso Saiz-Lopez, 14 Mar 2008
-
RC S989: 'reply', Rolf Sander, 26 Mar 2008
-
AC S1508: 'Response to Sander's report', Alfonso Saiz-Lopez, 10 Apr 2008
-
AC S1508: 'Response to Sander's report', Alfonso Saiz-Lopez, 10 Apr 2008
-
RC S989: 'reply', Rolf Sander, 26 Mar 2008
-
AC S752: 'Author response to Referee comments', Alfonso Saiz-Lopez, 14 Mar 2008
-
EC S1316: 'some additional questions', Lucy Carpenter, 04 Apr 2008
-
AC S1477: 'reply', Alfonso Saiz-Lopez, 09 Apr 2008
-
AC S1477: 'reply', Alfonso Saiz-Lopez, 09 Apr 2008
-
RC S1447: 'another comment', Rolf Sander, 09 Apr 2008
-
AC S1600: 'reply', Alfonso Saiz-Lopez, 12 Apr 2008
-
AC S1600: 'reply', Alfonso Saiz-Lopez, 12 Apr 2008
-
RC S1518: 'Comment', Anonymous Referee #1, 10 Apr 2008
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AC S1585: 'Response to Referee report', Alfonso Saiz-Lopez, 12 Apr 2008
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AC S1585: 'Response to Referee report', Alfonso Saiz-Lopez, 12 Apr 2008
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Cited
14 citations as recorded by crossref.
- Coupling of HO<sub>x</sub>, NO<sub>x</sub> and halogen chemistry in the antarctic boundary layer W. Bloss et al. 10.5194/acp-10-10187-2010
- Thermal evolution of diffusive transport of atmospheric halocarbons through artificial sea–ice M. Shaw et al. 10.1016/j.atmosenv.2011.08.023
- Iodine from bacterial iodide oxidization by Roseovarius spp. inhibits the growth of other bacteria D. Zhao et al. 10.1007/s00253-012-4043-y
- Sea ice dynamics influence halogen deposition to Svalbard A. Spolaor et al. 10.5194/tc-7-1645-2013
- New insights on the role of sea ice in intercepting atmospheric pollutants using 129 I J. Gómez-Guzmán et al. 10.1016/j.marpolbul.2014.10.004
- Influence of thin liquid films on polar ice chemistry: Implications for Earth and planetary science C. Boxe & A. Saiz-Lopez 10.1016/j.polar.2009.01.001
- Iodine emissions from the sea ice of the Weddell Sea H. Atkinson et al. 10.5194/acp-12-11229-2012
- Halogen species record Antarctic sea ice extent over glacial–interglacial periods A. Spolaor et al. 10.5194/acp-13-6623-2013
- A comparison of spectrophotometric and denuder based approaches for the determination of gaseous molecular iodine R. Chance et al. 10.5194/amt-3-177-2010
- Adsorbed water and thin liquid films on Mars C. Boxe et al. 10.1017/S1473550412000080
- Reactive halogen chemistry in the troposphere A. Saiz-Lopez & R. von Glasow 10.1039/c2cs35208g
- Halogen activation via interactions with environmental ice and snow in the polar lower troposphere and other regions J. Abbatt et al. 10.5194/acp-12-6237-2012
- Distribution of iodide and iodate in the Atlantic sector of the southern ocean during austral summer K. Bluhm et al. 10.1016/j.dsr2.2011.02.002
- Simultaneous satellite observations of IO and BrO over Antarctica A. Schönhardt et al. 10.5194/acp-12-6565-2012
