Physical and biogeochemical properties in landfast sea ice (Barrow, Alaska): Insights on brine and gas dynamics across seasons
The impacts of the seasonal evolution of sea-ice physical properties on ice-ocean biogeochemical exchanges were investigated in landfast ice at Barrow (Alaska) from January through June 2009. Three stages of brine dynamics across the annual cycle have been identified based on brine salinity, brine v...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/154484 2023-05-15T15:39:40+02:00 Physical and biogeochemical properties in landfast sea ice (Barrow, Alaska): Insights on brine and gas dynamics across seasons Zhou, J. M. Delille, B. Eicken, Hajo Vancoppenolle, Martin Brabant, Frédéric Carnat, Gauthier Geilfus, Nicolas Xavier Papakyriakou, T. Heinesch, B. Tison, Jean-Louis 2013 No full-text files http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/154484 en eng http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/154484 Journal of Geophysical Research, 118 (6 Sciences exactes et naturelles Glaciologie Océanographie physique et chimique Océanographie biologique info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2013 ftunivbruxelles 2022-06-12T21:12:36Z The impacts of the seasonal evolution of sea-ice physical properties on ice-ocean biogeochemical exchanges were investigated in landfast ice at Barrow (Alaska) from January through June 2009. Three stages of brine dynamics across the annual cycle have been identified based on brine salinity, brine volume fraction, and porous medium Rayleigh number (Ra). These are sea-ice bottom-layer convection, full-depth convection, and brine stratification. We further discuss the impact of brine dynamics on biogeochemical compounds in sea ice: stable isotopes of water (δD, δ18O), nutrients (NO 3 -, PO4 3-, NH4 +), microalgae (chlorophyll-a), and inert gas (argon). In general, full-depth convection events favor exchanges between sea ice and seawater, while brine stratification limits these exchanges. However, argon responds differently to brine dynamics than the other biogeochemical compounds analyzed in this study. This contrast is attributed to the impact of bubble nucleation on inert gas transport compared to the other biogeochemical compounds. We present a scenario for argon bubble formation and evolution in sea ice and suggest that a brine volume fraction approaching 7.5-10% is required for inert gas bubbles to escape from sea ice to the atmosphere. Key Points The stages of the brine dynamics within sea ice over the full growth-decay cycle Link between brine dynamics and ice-ocean exchanges of biogeochemical compounds First scenario for inert gas entrapment and migration in sea ice ©2013. American Geophysical Union. All Rights Reserved. info:eu-repo/semantics/published Article in Journal/Newspaper Barrow Sea ice Alaska DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
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Open Polar |
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DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Sciences exactes et naturelles Glaciologie Océanographie physique et chimique Océanographie biologique |
spellingShingle |
Sciences exactes et naturelles Glaciologie Océanographie physique et chimique Océanographie biologique Zhou, J. M. Delille, B. Eicken, Hajo Vancoppenolle, Martin Brabant, Frédéric Carnat, Gauthier Geilfus, Nicolas Xavier Papakyriakou, T. Heinesch, B. Tison, Jean-Louis Physical and biogeochemical properties in landfast sea ice (Barrow, Alaska): Insights on brine and gas dynamics across seasons |
topic_facet |
Sciences exactes et naturelles Glaciologie Océanographie physique et chimique Océanographie biologique |
description |
The impacts of the seasonal evolution of sea-ice physical properties on ice-ocean biogeochemical exchanges were investigated in landfast ice at Barrow (Alaska) from January through June 2009. Three stages of brine dynamics across the annual cycle have been identified based on brine salinity, brine volume fraction, and porous medium Rayleigh number (Ra). These are sea-ice bottom-layer convection, full-depth convection, and brine stratification. We further discuss the impact of brine dynamics on biogeochemical compounds in sea ice: stable isotopes of water (δD, δ18O), nutrients (NO 3 -, PO4 3-, NH4 +), microalgae (chlorophyll-a), and inert gas (argon). In general, full-depth convection events favor exchanges between sea ice and seawater, while brine stratification limits these exchanges. However, argon responds differently to brine dynamics than the other biogeochemical compounds analyzed in this study. This contrast is attributed to the impact of bubble nucleation on inert gas transport compared to the other biogeochemical compounds. We present a scenario for argon bubble formation and evolution in sea ice and suggest that a brine volume fraction approaching 7.5-10% is required for inert gas bubbles to escape from sea ice to the atmosphere. Key Points The stages of the brine dynamics within sea ice over the full growth-decay cycle Link between brine dynamics and ice-ocean exchanges of biogeochemical compounds First scenario for inert gas entrapment and migration in sea ice ©2013. American Geophysical Union. All Rights Reserved. info:eu-repo/semantics/published |
format |
Article in Journal/Newspaper |
author |
Zhou, J. M. Delille, B. Eicken, Hajo Vancoppenolle, Martin Brabant, Frédéric Carnat, Gauthier Geilfus, Nicolas Xavier Papakyriakou, T. Heinesch, B. Tison, Jean-Louis |
author_facet |
Zhou, J. M. Delille, B. Eicken, Hajo Vancoppenolle, Martin Brabant, Frédéric Carnat, Gauthier Geilfus, Nicolas Xavier Papakyriakou, T. Heinesch, B. Tison, Jean-Louis |
author_sort |
Zhou, J. M. |
title |
Physical and biogeochemical properties in landfast sea ice (Barrow, Alaska): Insights on brine and gas dynamics across seasons |
title_short |
Physical and biogeochemical properties in landfast sea ice (Barrow, Alaska): Insights on brine and gas dynamics across seasons |
title_full |
Physical and biogeochemical properties in landfast sea ice (Barrow, Alaska): Insights on brine and gas dynamics across seasons |
title_fullStr |
Physical and biogeochemical properties in landfast sea ice (Barrow, Alaska): Insights on brine and gas dynamics across seasons |
title_full_unstemmed |
Physical and biogeochemical properties in landfast sea ice (Barrow, Alaska): Insights on brine and gas dynamics across seasons |
title_sort |
physical and biogeochemical properties in landfast sea ice (barrow, alaska): insights on brine and gas dynamics across seasons |
publishDate |
2013 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/154484 |
genre |
Barrow Sea ice Alaska |
genre_facet |
Barrow Sea ice Alaska |
op_source |
Journal of Geophysical Research, 118 (6 |
op_relation |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/154484 |
_version_ |
1766371703609360384 |