A mechanism for biologically-induced iodine emissions from sea-ice
International audience 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. T...
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ftinsu:oai:HAL:hal-00303972v1 2023-11-12T04:03:53+01:00 A mechanism for biologically-induced iodine emissions from sea-ice Saiz-Lopez, A. Boxe, C. S. Jet Propulsion Laboratory (JPL) NASA-California Institute of Technology (CALTECH) 2008-02-13 https://hal.science/hal-00303972 https://hal.science/hal-00303972/document https://hal.science/hal-00303972/file/acpd-8-2953-2008.pdf en eng HAL CCSD European Geosciences Union hal-00303972 https://hal.science/hal-00303972 https://hal.science/hal-00303972/document https://hal.science/hal-00303972/file/acpd-8-2953-2008.pdf info:eu-repo/semantics/OpenAccess ISSN: 1680-7367 EISSN: 1680-7375 Atmospheric Chemistry and Physics Discussions https://hal.science/hal-00303972 Atmospheric Chemistry and Physics Discussions, 2008, 8 (1), pp.2953-2976 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2008 ftinsu 2023-10-25T16:26:15Z International audience 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. I 2 , 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. Article in Journal/Newspaper Antarc* Antarctic Antarctica Sea ice Institut national des sciences de l'Univers: HAL-INSU Antarctic The Antarctic |
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Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Saiz-Lopez, A. Boxe, C. S. A mechanism for biologically-induced iodine emissions from sea-ice |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience 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. I 2 , 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. |
author2 |
Jet Propulsion Laboratory (JPL) NASA-California Institute of Technology (CALTECH) |
format |
Article in Journal/Newspaper |
author |
Saiz-Lopez, A. Boxe, C. S. |
author_facet |
Saiz-Lopez, A. Boxe, C. S. |
author_sort |
Saiz-Lopez, A. |
title |
A mechanism for biologically-induced iodine emissions from sea-ice |
title_short |
A mechanism for biologically-induced iodine emissions from sea-ice |
title_full |
A mechanism for biologically-induced iodine emissions from sea-ice |
title_fullStr |
A mechanism for biologically-induced iodine emissions from sea-ice |
title_full_unstemmed |
A mechanism for biologically-induced iodine emissions from sea-ice |
title_sort |
mechanism for biologically-induced iodine emissions from sea-ice |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://hal.science/hal-00303972 https://hal.science/hal-00303972/document https://hal.science/hal-00303972/file/acpd-8-2953-2008.pdf |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctica Sea ice |
genre_facet |
Antarc* Antarctic Antarctica Sea ice |
op_source |
ISSN: 1680-7367 EISSN: 1680-7375 Atmospheric Chemistry and Physics Discussions https://hal.science/hal-00303972 Atmospheric Chemistry and Physics Discussions, 2008, 8 (1), pp.2953-2976 |
op_relation |
hal-00303972 https://hal.science/hal-00303972 https://hal.science/hal-00303972/document https://hal.science/hal-00303972/file/acpd-8-2953-2008.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782339468218335232 |