Inorganic carbon system dynamics in landfast Arctic sea ice during the early-melt period
We present the results of a 6 week time series of carbonate system and stable isotope measurements investigating the effects of sea ice on air-sea CO 2 exchange during the early melt period in the Canadian Arctic Archipelago. Our observations revealed significant changes in sea ice and sackhole brin...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/217327 2023-05-15T14:29:01+02:00 Inorganic carbon system dynamics in landfast Arctic sea ice during the early-melt period Brown, Kristina A. Miller, Lisa L.M. Mundy, Christopher John Papakyriakou, Tim Roger, Francois Gosselin, Michel Carnat, Gauthier Swystun, Kyle Tortell, Philippe P.D. 2015-05 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/217327 https://dipot.ulb.ac.be/dspace/bitstream/2013/217327/3/217327.pdf en eng uri/info:doi/10.1002/2014JC010620 uri/info:scp/84934945188 https://dipot.ulb.ac.be/dspace/bitstream/2013/217327/3/217327.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/217327 1 full-text file(s): info:eu-repo/semantics/restrictedAccess Journal of geophysical research. Oceans, 120 (5 Sciences de l'espace Phénomènes atmosphériques Géographie physique Sciences de la terre et du cosmos Arctic Ocean brines carbon cycling CO 2 sea ice stable isotopes info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2015 ftunivbruxelles 2022-06-12T21:09:45Z We present the results of a 6 week time series of carbonate system and stable isotope measurements investigating the effects of sea ice on air-sea CO 2 exchange during the early melt period in the Canadian Arctic Archipelago. Our observations revealed significant changes in sea ice and sackhole brine carbonate system parameters that were associated with increasing temperatures and the buildup of chlorophyll a in bottom ice. The warming sea-ice column could be separated into distinct geochemical zones where biotic and abiotic processes exerted different influences on inorganic carbon and pCO 2 distributions. In the bottom ice, biological carbon uptake maintained undersaturated pCO 2 conditions throughout the time series, while pCO 2 was supersaturated in the upper ice. Low CO 2 permeability of the sea ice matrix and snow cover effectively impeded CO 2 efflux to the atmosphere, despite a strong pCO 2 gradient. Throughout the middle of the ice column, brine pCO 2 decreased significantly with time and was tightly controlled by solubility, as sea ice temperature and in situ melt dilution increased. Once the influence of melt dilution was accounted for, both CaCO 3 dissolution and seawater mixing were found to contribute alkalinity and dissolved inorganic carbon to brines, with the CaCO 3 contribution driving brine pCO 2 to values lower than predicted from melt-water dilution alone. This field study reveals a dynamic carbon system within the rapidly warming sea ice, prior to snow melt. We suggest that the early spring period drives the ice column toward pCO 2 undersaturation, contributing to a weak atmospheric CO 2 sink as the melt period advances. Key Points: As spring Arctic sea ice matures, carbon dioxide undersaturation develops Abiotic processes dominated inorganic carbon in upper ice and early in season Biotic processes controlled inorganic carbon in bottom ice and late in season SCOPUS: ar.j FLWIN SCOPUS: ar.j info:eu-repo/semantics/published Article in Journal/Newspaper Arctic Archipelago Arctic Arctic Ocean Canadian Arctic Archipelago Sea ice DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) Arctic Arctic Ocean Canadian Arctic Archipelago |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Sciences de l'espace Phénomènes atmosphériques Géographie physique Sciences de la terre et du cosmos Arctic Ocean brines carbon cycling CO 2 sea ice stable isotopes |
spellingShingle |
Sciences de l'espace Phénomènes atmosphériques Géographie physique Sciences de la terre et du cosmos Arctic Ocean brines carbon cycling CO 2 sea ice stable isotopes Brown, Kristina A. Miller, Lisa L.M. Mundy, Christopher John Papakyriakou, Tim Roger, Francois Gosselin, Michel Carnat, Gauthier Swystun, Kyle Tortell, Philippe P.D. Inorganic carbon system dynamics in landfast Arctic sea ice during the early-melt period |
topic_facet |
Sciences de l'espace Phénomènes atmosphériques Géographie physique Sciences de la terre et du cosmos Arctic Ocean brines carbon cycling CO 2 sea ice stable isotopes |
description |
We present the results of a 6 week time series of carbonate system and stable isotope measurements investigating the effects of sea ice on air-sea CO 2 exchange during the early melt period in the Canadian Arctic Archipelago. Our observations revealed significant changes in sea ice and sackhole brine carbonate system parameters that were associated with increasing temperatures and the buildup of chlorophyll a in bottom ice. The warming sea-ice column could be separated into distinct geochemical zones where biotic and abiotic processes exerted different influences on inorganic carbon and pCO 2 distributions. In the bottom ice, biological carbon uptake maintained undersaturated pCO 2 conditions throughout the time series, while pCO 2 was supersaturated in the upper ice. Low CO 2 permeability of the sea ice matrix and snow cover effectively impeded CO 2 efflux to the atmosphere, despite a strong pCO 2 gradient. Throughout the middle of the ice column, brine pCO 2 decreased significantly with time and was tightly controlled by solubility, as sea ice temperature and in situ melt dilution increased. Once the influence of melt dilution was accounted for, both CaCO 3 dissolution and seawater mixing were found to contribute alkalinity and dissolved inorganic carbon to brines, with the CaCO 3 contribution driving brine pCO 2 to values lower than predicted from melt-water dilution alone. This field study reveals a dynamic carbon system within the rapidly warming sea ice, prior to snow melt. We suggest that the early spring period drives the ice column toward pCO 2 undersaturation, contributing to a weak atmospheric CO 2 sink as the melt period advances. Key Points: As spring Arctic sea ice matures, carbon dioxide undersaturation develops Abiotic processes dominated inorganic carbon in upper ice and early in season Biotic processes controlled inorganic carbon in bottom ice and late in season SCOPUS: ar.j FLWIN SCOPUS: ar.j info:eu-repo/semantics/published |
format |
Article in Journal/Newspaper |
author |
Brown, Kristina A. Miller, Lisa L.M. Mundy, Christopher John Papakyriakou, Tim Roger, Francois Gosselin, Michel Carnat, Gauthier Swystun, Kyle Tortell, Philippe P.D. |
author_facet |
Brown, Kristina A. Miller, Lisa L.M. Mundy, Christopher John Papakyriakou, Tim Roger, Francois Gosselin, Michel Carnat, Gauthier Swystun, Kyle Tortell, Philippe P.D. |
author_sort |
Brown, Kristina A. |
title |
Inorganic carbon system dynamics in landfast Arctic sea ice during the early-melt period |
title_short |
Inorganic carbon system dynamics in landfast Arctic sea ice during the early-melt period |
title_full |
Inorganic carbon system dynamics in landfast Arctic sea ice during the early-melt period |
title_fullStr |
Inorganic carbon system dynamics in landfast Arctic sea ice during the early-melt period |
title_full_unstemmed |
Inorganic carbon system dynamics in landfast Arctic sea ice during the early-melt period |
title_sort |
inorganic carbon system dynamics in landfast arctic sea ice during the early-melt period |
publishDate |
2015 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/217327 https://dipot.ulb.ac.be/dspace/bitstream/2013/217327/3/217327.pdf |
geographic |
Arctic Arctic Ocean Canadian Arctic Archipelago |
geographic_facet |
Arctic Arctic Ocean Canadian Arctic Archipelago |
genre |
Arctic Archipelago Arctic Arctic Ocean Canadian Arctic Archipelago Sea ice |
genre_facet |
Arctic Archipelago Arctic Arctic Ocean Canadian Arctic Archipelago Sea ice |
op_source |
Journal of geophysical research. Oceans, 120 (5 |
op_relation |
uri/info:doi/10.1002/2014JC010620 uri/info:scp/84934945188 https://dipot.ulb.ac.be/dspace/bitstream/2013/217327/3/217327.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/217327 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/restrictedAccess |
_version_ |
1766303123402391552 |