Diurnal cycle of iodine, bromine, and mercury concentrations in Svalbard surface snow
Sunlit snow is highly photochemically active and plays a key role in the exchange of gas phase species between the cryosphere and the atmosphere. Here, we investigate the behaviour of two selected species in surface snow: mercury (Hg) and iodine (I). Hg can deposit year-round and accumulate in the s...
Published in: | Atmospheric Chemistry and Physics |
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Format: | Article in Journal/Newspaper |
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Online Access: | http://hdl.handle.net/10278/3725461 https://doi.org/10.5194/acp-19-13325-2019 https://www.atmos-chem-phys.net/19/13325/2019/ |
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ftuniveneziairis:oai:iris.unive.it:10278/3725461 2024-04-14T08:20:16+00:00 Diurnal cycle of iodine, bromine, and mercury concentrations in Svalbard surface snow Spolaor, Andrea Barbaro, Elena Cappelletti, David Turetta, Clara Mazzola, Mauro Giardi, Fabio Björkman, Mats P. Lucchetta, Federico Dallo, Federico Pfaffhuber, Katrine Aspmo Angot, Hélène Dommergue, Aurelien Maturilli, Marion Saiz-Lopez, Alfonso Barbante, Carlo Cairns, Warren R. L. Spolaor, Andrea Barbaro, Elena Cappelletti, David Turetta, Clara Mazzola, Mauro Giardi, Fabio Björkman, Mats P. Lucchetta, Federico Dallo, Federico Pfaffhuber, Katrine Aspmo Angot, Hélène Dommergue, Aurelien Maturilli, Marion Saiz-Lopez, Alfonso Barbante, Carlo Cairns, Warren R. L. 2019 ELETTRONICO http://hdl.handle.net/10278/3725461 https://doi.org/10.5194/acp-19-13325-2019 https://www.atmos-chem-phys.net/19/13325/2019/ eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000494263100001 volume:19 issue:20 firstpage:13325 lastpage:13339 numberofpages:15 journal:ATMOSPHERIC CHEMISTRY AND PHYSICS info:eu-repo/grantAgreement/EC/H2020/689443 http://hdl.handle.net/10278/3725461 doi:10.5194/acp-19-13325-2019 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85074516088 https://www.atmos-chem-phys.net/19/13325/2019/ info:eu-repo/semantics/openAccess cryosphere atmosphere mercury iodine bromine post-depositional processes surface snow Ny-Ålesund Svalbard Settore CHIM/01 - Chimica Analitica info:eu-repo/semantics/article 2019 ftuniveneziairis https://doi.org/10.5194/acp-19-13325-2019 2024-03-21T18:11:36Z Sunlit snow is highly photochemically active and plays a key role in the exchange of gas phase species between the cryosphere and the atmosphere. Here, we investigate the behaviour of two selected species in surface snow: mercury (Hg) and iodine (I). Hg can deposit year-round and accumulate in the snowpack. However, photo-induced re-emission of gas phase Hg from the surface has been widely reported. Iodine is active in atmospheric new particle formation, especially in the marine boundary layer, and in the destruction of atmospheric ozone. It can also undergo photochemical re-emission. Although previous studies indicate possible post-depositional processes, little is known about the diurnal behaviour of these two species and their interaction in surface snow. The mechanisms are still poorly constrained, and no field experiments have been performed in different seasons to investigate the magnitude of re-emission processes Three sampling campaigns conducted at an hourly resolution for 3 d each were carried out near Ny-Ålesund (Svalbard) to study the behaviour of mercury and iodine in surface snow under different sunlight and environmental conditions (24 h darkness, 24 h sunlight and day–night cycles). Our results indicate a different behaviour of mercury and iodine in surface snow during the different campaigns. The day–night experiments demonstrate the existence of a diurnal cycle in surface snow for Hg and iodine, indicating that these species are indeed influenced by the daily solar radiation cycle. Differently, bromine did not show any diurnal cycle. The diurnal cycle also disappeared for Hg and iodine during the 24 h sunlight period and during 24 h darkness experiments supporting the idea of the occurrence (absence) of a continuous recycling or exchange at the snow–air interface. These results demonstrate that this surface snow recycling is seasonally dependent, through sunlight. They also highlight the non-negligible role that snowpack emissions have on ambient air concentrations and potentially on ... Article in Journal/Newspaper Svalbard Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) Svalbard Atmospheric Chemistry and Physics 19 20 13325 13339 |
institution |
Open Polar |
collection |
Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) |
op_collection_id |
ftuniveneziairis |
language |
English |
topic |
cryosphere atmosphere mercury iodine bromine post-depositional processes surface snow Ny-Ålesund Svalbard Settore CHIM/01 - Chimica Analitica |
spellingShingle |
cryosphere atmosphere mercury iodine bromine post-depositional processes surface snow Ny-Ålesund Svalbard Settore CHIM/01 - Chimica Analitica Spolaor, Andrea Barbaro, Elena Cappelletti, David Turetta, Clara Mazzola, Mauro Giardi, Fabio Björkman, Mats P. Lucchetta, Federico Dallo, Federico Pfaffhuber, Katrine Aspmo Angot, Hélène Dommergue, Aurelien Maturilli, Marion Saiz-Lopez, Alfonso Barbante, Carlo Cairns, Warren R. L. Diurnal cycle of iodine, bromine, and mercury concentrations in Svalbard surface snow |
topic_facet |
cryosphere atmosphere mercury iodine bromine post-depositional processes surface snow Ny-Ålesund Svalbard Settore CHIM/01 - Chimica Analitica |
description |
Sunlit snow is highly photochemically active and plays a key role in the exchange of gas phase species between the cryosphere and the atmosphere. Here, we investigate the behaviour of two selected species in surface snow: mercury (Hg) and iodine (I). Hg can deposit year-round and accumulate in the snowpack. However, photo-induced re-emission of gas phase Hg from the surface has been widely reported. Iodine is active in atmospheric new particle formation, especially in the marine boundary layer, and in the destruction of atmospheric ozone. It can also undergo photochemical re-emission. Although previous studies indicate possible post-depositional processes, little is known about the diurnal behaviour of these two species and their interaction in surface snow. The mechanisms are still poorly constrained, and no field experiments have been performed in different seasons to investigate the magnitude of re-emission processes Three sampling campaigns conducted at an hourly resolution for 3 d each were carried out near Ny-Ålesund (Svalbard) to study the behaviour of mercury and iodine in surface snow under different sunlight and environmental conditions (24 h darkness, 24 h sunlight and day–night cycles). Our results indicate a different behaviour of mercury and iodine in surface snow during the different campaigns. The day–night experiments demonstrate the existence of a diurnal cycle in surface snow for Hg and iodine, indicating that these species are indeed influenced by the daily solar radiation cycle. Differently, bromine did not show any diurnal cycle. The diurnal cycle also disappeared for Hg and iodine during the 24 h sunlight period and during 24 h darkness experiments supporting the idea of the occurrence (absence) of a continuous recycling or exchange at the snow–air interface. These results demonstrate that this surface snow recycling is seasonally dependent, through sunlight. They also highlight the non-negligible role that snowpack emissions have on ambient air concentrations and potentially on ... |
author2 |
Spolaor, Andrea Barbaro, Elena Cappelletti, David Turetta, Clara Mazzola, Mauro Giardi, Fabio Björkman, Mats P. Lucchetta, Federico Dallo, Federico Pfaffhuber, Katrine Aspmo Angot, Hélène Dommergue, Aurelien Maturilli, Marion Saiz-Lopez, Alfonso Barbante, Carlo Cairns, Warren R. L. |
format |
Article in Journal/Newspaper |
author |
Spolaor, Andrea Barbaro, Elena Cappelletti, David Turetta, Clara Mazzola, Mauro Giardi, Fabio Björkman, Mats P. Lucchetta, Federico Dallo, Federico Pfaffhuber, Katrine Aspmo Angot, Hélène Dommergue, Aurelien Maturilli, Marion Saiz-Lopez, Alfonso Barbante, Carlo Cairns, Warren R. L. |
author_facet |
Spolaor, Andrea Barbaro, Elena Cappelletti, David Turetta, Clara Mazzola, Mauro Giardi, Fabio Björkman, Mats P. Lucchetta, Federico Dallo, Federico Pfaffhuber, Katrine Aspmo Angot, Hélène Dommergue, Aurelien Maturilli, Marion Saiz-Lopez, Alfonso Barbante, Carlo Cairns, Warren R. L. |
author_sort |
Spolaor, Andrea |
title |
Diurnal cycle of iodine, bromine, and mercury concentrations in Svalbard surface snow |
title_short |
Diurnal cycle of iodine, bromine, and mercury concentrations in Svalbard surface snow |
title_full |
Diurnal cycle of iodine, bromine, and mercury concentrations in Svalbard surface snow |
title_fullStr |
Diurnal cycle of iodine, bromine, and mercury concentrations in Svalbard surface snow |
title_full_unstemmed |
Diurnal cycle of iodine, bromine, and mercury concentrations in Svalbard surface snow |
title_sort |
diurnal cycle of iodine, bromine, and mercury concentrations in svalbard surface snow |
publishDate |
2019 |
url |
http://hdl.handle.net/10278/3725461 https://doi.org/10.5194/acp-19-13325-2019 https://www.atmos-chem-phys.net/19/13325/2019/ |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
Svalbard |
genre_facet |
Svalbard |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000494263100001 volume:19 issue:20 firstpage:13325 lastpage:13339 numberofpages:15 journal:ATMOSPHERIC CHEMISTRY AND PHYSICS info:eu-repo/grantAgreement/EC/H2020/689443 http://hdl.handle.net/10278/3725461 doi:10.5194/acp-19-13325-2019 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85074516088 https://www.atmos-chem-phys.net/19/13325/2019/ |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/acp-19-13325-2019 |
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Atmospheric Chemistry and Physics |
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19 |
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20 |
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13325 |
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13339 |
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