Reproducing Arctic springtime tropospheric ozone and mercury depletion events in an outdoor mesocosm sea ice facility
14 pags., 8 figs., 2 tabs. The episodic buildup of gas-phase reactive bromine species over sea ice and snowpack in the springtime Arctic plays an important role in boundary layer processes, causing annual concurrent depletion of ozone and gaseous elemental mercury (GEM) during polar sunrise. Extensi...
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Copernicus Publications
2022
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Online Access: | http://hdl.handle.net/10261/268166 https://doi.org/10.5194/acp-22-1811-2022 https://doi.org/10.13039/501100000038 https://doi.org/10.13039/501100001804 https://api.elsevier.com/content/abstract/scopus_id/85124764332 |
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ftcsic:oai:digital.csic.es:10261/268166 2024-06-23T07:49:50+00:00 Reproducing Arctic springtime tropospheric ozone and mercury depletion events in an outdoor mesocosm sea ice facility Gao, Zhiyuan Geilfus, Nicolas Xavier Saiz-Lopez, A. Wang, Feiyue Natural Sciences and Engineering Research Council of Canada Canada Research Chairs 2022-02-08 http://hdl.handle.net/10261/268166 https://doi.org/10.5194/acp-22-1811-2022 https://doi.org/10.13039/501100000038 https://doi.org/10.13039/501100001804 https://api.elsevier.com/content/abstract/scopus_id/85124764332 en eng Copernicus Publications Atmospheric Chemistry and Physics Publisher's version https://doi.org/10.5194/acp-22-1811-2022 Sí Atmospheric Chemistry and Physics 22(3): 1811-1824 (2022) 1680-7316 http://hdl.handle.net/10261/268166 doi:10.5194/acp-22-1811-2022 http://dx.doi.org/10.13039/501100000038 http://dx.doi.org/10.13039/501100001804 2-s2.0-85124764332 https://api.elsevier.com/content/abstract/scopus_id/85124764332 open artículo http://purl.org/coar/resource_type/c_6501 2022 ftcsic https://doi.org/10.5194/acp-22-1811-202210.13039/50110000003810.13039/501100001804 2024-05-29T00:00:47Z 14 pags., 8 figs., 2 tabs. The episodic buildup of gas-phase reactive bromine species over sea ice and snowpack in the springtime Arctic plays an important role in boundary layer processes, causing annual concurrent depletion of ozone and gaseous elemental mercury (GEM) during polar sunrise. Extensive studies have shown that these phenomena, known as bromine explosion events (BEEs), ozone depletion events (ODEs), and mercury depletion events (MDEs) are all triggered by reactive bromine species that are photochemically activated from bromide via multi-phase reactions under freezing air temperatures. However, major knowledge gaps exist in both fundamental cryo-photochemical processes causing these events and meteorological conditions that may affect their timing and magnitude. Here, we report an outdoor mesocosm study in which we successfully reproduced ODEs and MDEs at the Sea-ice Environmental Research Facility (SERF) in Winnipeg, Canada. By monitoring ozone and GEM concentrations inside large acrylic tubes over bromide-enriched artificial seawater during sea ice freeze-and-melt cycles, we observed mid-day photochemical ozone and GEM loss in winter in the in-tube boundary layer air immediately above the sea ice surface in a pattern that is characteristic of BEE-induced ODEs and MDEs in the Arctic. The importance of UV radiation and the presence of a condensed phase (experimental sea ice or snow) in causing such reactions were demonstrated by comparing ozone and GEM concentrations between the UV-transmitting and UV-blocking acrylic tubes under different air temperatures. The ability of reproducing BEE-induced photochemical phenomena in a mesocosm in a non-polar region provides a new approach to systematically studying the cryo-photochemical processes and meteorological conditions leading to BEEs, ODEs, and MDEs in the Arctic, their role in biogeochemical cycles across the ocean-sea ice-atmosphere interface, and their sensitivities to climate change. This research has been supported by the Natural Sciences and ... Article in Journal/Newspaper Arctic Climate change Sea ice Digital.CSIC (Spanish National Research Council) Arctic Canada Atmospheric Chemistry and Physics 22 3 1811 1824 |
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Open Polar |
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Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
description |
14 pags., 8 figs., 2 tabs. The episodic buildup of gas-phase reactive bromine species over sea ice and snowpack in the springtime Arctic plays an important role in boundary layer processes, causing annual concurrent depletion of ozone and gaseous elemental mercury (GEM) during polar sunrise. Extensive studies have shown that these phenomena, known as bromine explosion events (BEEs), ozone depletion events (ODEs), and mercury depletion events (MDEs) are all triggered by reactive bromine species that are photochemically activated from bromide via multi-phase reactions under freezing air temperatures. However, major knowledge gaps exist in both fundamental cryo-photochemical processes causing these events and meteorological conditions that may affect their timing and magnitude. Here, we report an outdoor mesocosm study in which we successfully reproduced ODEs and MDEs at the Sea-ice Environmental Research Facility (SERF) in Winnipeg, Canada. By monitoring ozone and GEM concentrations inside large acrylic tubes over bromide-enriched artificial seawater during sea ice freeze-and-melt cycles, we observed mid-day photochemical ozone and GEM loss in winter in the in-tube boundary layer air immediately above the sea ice surface in a pattern that is characteristic of BEE-induced ODEs and MDEs in the Arctic. The importance of UV radiation and the presence of a condensed phase (experimental sea ice or snow) in causing such reactions were demonstrated by comparing ozone and GEM concentrations between the UV-transmitting and UV-blocking acrylic tubes under different air temperatures. The ability of reproducing BEE-induced photochemical phenomena in a mesocosm in a non-polar region provides a new approach to systematically studying the cryo-photochemical processes and meteorological conditions leading to BEEs, ODEs, and MDEs in the Arctic, their role in biogeochemical cycles across the ocean-sea ice-atmosphere interface, and their sensitivities to climate change. This research has been supported by the Natural Sciences and ... |
author2 |
Natural Sciences and Engineering Research Council of Canada Canada Research Chairs |
format |
Article in Journal/Newspaper |
author |
Gao, Zhiyuan Geilfus, Nicolas Xavier Saiz-Lopez, A. Wang, Feiyue |
spellingShingle |
Gao, Zhiyuan Geilfus, Nicolas Xavier Saiz-Lopez, A. Wang, Feiyue Reproducing Arctic springtime tropospheric ozone and mercury depletion events in an outdoor mesocosm sea ice facility |
author_facet |
Gao, Zhiyuan Geilfus, Nicolas Xavier Saiz-Lopez, A. Wang, Feiyue |
author_sort |
Gao, Zhiyuan |
title |
Reproducing Arctic springtime tropospheric ozone and mercury depletion events in an outdoor mesocosm sea ice facility |
title_short |
Reproducing Arctic springtime tropospheric ozone and mercury depletion events in an outdoor mesocosm sea ice facility |
title_full |
Reproducing Arctic springtime tropospheric ozone and mercury depletion events in an outdoor mesocosm sea ice facility |
title_fullStr |
Reproducing Arctic springtime tropospheric ozone and mercury depletion events in an outdoor mesocosm sea ice facility |
title_full_unstemmed |
Reproducing Arctic springtime tropospheric ozone and mercury depletion events in an outdoor mesocosm sea ice facility |
title_sort |
reproducing arctic springtime tropospheric ozone and mercury depletion events in an outdoor mesocosm sea ice facility |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
http://hdl.handle.net/10261/268166 https://doi.org/10.5194/acp-22-1811-2022 https://doi.org/10.13039/501100000038 https://doi.org/10.13039/501100001804 https://api.elsevier.com/content/abstract/scopus_id/85124764332 |
geographic |
Arctic Canada |
geographic_facet |
Arctic Canada |
genre |
Arctic Climate change Sea ice |
genre_facet |
Arctic Climate change Sea ice |
op_relation |
Atmospheric Chemistry and Physics Publisher's version https://doi.org/10.5194/acp-22-1811-2022 Sí Atmospheric Chemistry and Physics 22(3): 1811-1824 (2022) 1680-7316 http://hdl.handle.net/10261/268166 doi:10.5194/acp-22-1811-2022 http://dx.doi.org/10.13039/501100000038 http://dx.doi.org/10.13039/501100001804 2-s2.0-85124764332 https://api.elsevier.com/content/abstract/scopus_id/85124764332 |
op_rights |
open |
op_doi |
https://doi.org/10.5194/acp-22-1811-202210.13039/50110000003810.13039/501100001804 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
22 |
container_issue |
3 |
container_start_page |
1811 |
op_container_end_page |
1824 |
_version_ |
1802640508056502272 |