Estimates of ikaite export from sea ice to the underlying seawater in a sea ice–seawater mesocosm
The precipitation of ikaite and its fate within sea ice is still poorly understood. We quantify temporal inorganic carbon dynamics in sea ice from initial formation to its melt in a sea ice–seawater mesocosm pool from 11 to 29 January 2013. Based on measurements of total alkalinity (TA) and total di...
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Copernicus Publications
2016
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ftdoajarticles:oai:doaj.org/article:43e154d45fe24beaa19fffddc07f2430 2023-05-15T18:16:05+02:00 Estimates of ikaite export from sea ice to the underlying seawater in a sea ice–seawater mesocosm N.-X. Geilfus R. J. Galley B. G. T. Else K. Campbell T. Papakyriakou O. Crabeck M. Lemes B. Delille S. Rysgaard 2016-09-01T00:00:00Z https://doi.org/10.5194/tc-10-2173-2016 https://doaj.org/article/43e154d45fe24beaa19fffddc07f2430 EN eng Copernicus Publications https://www.the-cryosphere.net/10/2173/2016/tc-10-2173-2016.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-10-2173-2016 1994-0416 1994-0424 https://doaj.org/article/43e154d45fe24beaa19fffddc07f2430 The Cryosphere, Vol 10, Pp 2173-2189 (2016) Environmental sciences GE1-350 Geology QE1-996.5 article 2016 ftdoajarticles https://doi.org/10.5194/tc-10-2173-2016 2022-12-31T04:21:31Z The precipitation of ikaite and its fate within sea ice is still poorly understood. We quantify temporal inorganic carbon dynamics in sea ice from initial formation to its melt in a sea ice–seawater mesocosm pool from 11 to 29 January 2013. Based on measurements of total alkalinity (TA) and total dissolved inorganic carbon (TCO 2 ), the main processes affecting inorganic carbon dynamics within sea ice were ikaite precipitation and CO 2 exchange with the atmosphere. In the underlying seawater, the dissolution of ikaite was the main process affecting inorganic carbon dynamics. Sea ice acted as an active layer, releasing CO 2 to the atmosphere during the growth phase, taking up CO 2 as it melted and exporting both ikaite and TCO 2 into the underlying seawater during the whole experiment. Ikaite precipitation of up to 167 µmol<mspace width="0.125em" linebreak="nobreak"/>kg −1 within sea ice was estimated, while its export and dissolution into the underlying seawater was responsible for a TA increase of 64–66 µmol<mspace width="0.125em" linebreak="nobreak"/>kg −1 in the water column. The export of TCO 2 from sea ice to the water column increased the underlying seawater TCO 2 by 43.5 µmol<mspace linebreak="nobreak" width="0.125em"/>kg −1 , suggesting that almost all of the TCO 2 that left the sea ice was exported to the underlying seawater. The export of ikaite from the ice to the underlying seawater was associated with brine rejection during sea ice growth, increased vertical connectivity in sea ice due to the upward percolation of seawater and meltwater flushing during sea ice melt. Based on the change in TA in the water column around the onset of sea ice melt, more than half of the total ikaite precipitated in the ice during sea ice growth was still contained in the ice when the sea ice began to melt. Ikaite crystal dissolution in the water column kept the seawater p CO 2 undersaturated with respect to the atmosphere in spite of increased salinity, TA and TCO 2 associated with sea ice growth. ... Article in Journal/Newspaper Sea ice The Cryosphere Directory of Open Access Journals: DOAJ Articles The Cryosphere 10 5 2173 2189 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 N.-X. Geilfus R. J. Galley B. G. T. Else K. Campbell T. Papakyriakou O. Crabeck M. Lemes B. Delille S. Rysgaard Estimates of ikaite export from sea ice to the underlying seawater in a sea ice–seawater mesocosm |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
The precipitation of ikaite and its fate within sea ice is still poorly understood. We quantify temporal inorganic carbon dynamics in sea ice from initial formation to its melt in a sea ice–seawater mesocosm pool from 11 to 29 January 2013. Based on measurements of total alkalinity (TA) and total dissolved inorganic carbon (TCO 2 ), the main processes affecting inorganic carbon dynamics within sea ice were ikaite precipitation and CO 2 exchange with the atmosphere. In the underlying seawater, the dissolution of ikaite was the main process affecting inorganic carbon dynamics. Sea ice acted as an active layer, releasing CO 2 to the atmosphere during the growth phase, taking up CO 2 as it melted and exporting both ikaite and TCO 2 into the underlying seawater during the whole experiment. Ikaite precipitation of up to 167 µmol<mspace width="0.125em" linebreak="nobreak"/>kg −1 within sea ice was estimated, while its export and dissolution into the underlying seawater was responsible for a TA increase of 64–66 µmol<mspace width="0.125em" linebreak="nobreak"/>kg −1 in the water column. The export of TCO 2 from sea ice to the water column increased the underlying seawater TCO 2 by 43.5 µmol<mspace linebreak="nobreak" width="0.125em"/>kg −1 , suggesting that almost all of the TCO 2 that left the sea ice was exported to the underlying seawater. The export of ikaite from the ice to the underlying seawater was associated with brine rejection during sea ice growth, increased vertical connectivity in sea ice due to the upward percolation of seawater and meltwater flushing during sea ice melt. Based on the change in TA in the water column around the onset of sea ice melt, more than half of the total ikaite precipitated in the ice during sea ice growth was still contained in the ice when the sea ice began to melt. Ikaite crystal dissolution in the water column kept the seawater p CO 2 undersaturated with respect to the atmosphere in spite of increased salinity, TA and TCO 2 associated with sea ice growth. ... |
format |
Article in Journal/Newspaper |
author |
N.-X. Geilfus R. J. Galley B. G. T. Else K. Campbell T. Papakyriakou O. Crabeck M. Lemes B. Delille S. Rysgaard |
author_facet |
N.-X. Geilfus R. J. Galley B. G. T. Else K. Campbell T. Papakyriakou O. Crabeck M. Lemes B. Delille S. Rysgaard |
author_sort |
N.-X. Geilfus |
title |
Estimates of ikaite export from sea ice to the underlying seawater in a sea ice–seawater mesocosm |
title_short |
Estimates of ikaite export from sea ice to the underlying seawater in a sea ice–seawater mesocosm |
title_full |
Estimates of ikaite export from sea ice to the underlying seawater in a sea ice–seawater mesocosm |
title_fullStr |
Estimates of ikaite export from sea ice to the underlying seawater in a sea ice–seawater mesocosm |
title_full_unstemmed |
Estimates of ikaite export from sea ice to the underlying seawater in a sea ice–seawater mesocosm |
title_sort |
estimates of ikaite export from sea ice to the underlying seawater in a sea ice–seawater mesocosm |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/tc-10-2173-2016 https://doaj.org/article/43e154d45fe24beaa19fffddc07f2430 |
genre |
Sea ice The Cryosphere |
genre_facet |
Sea ice The Cryosphere |
op_source |
The Cryosphere, Vol 10, Pp 2173-2189 (2016) |
op_relation |
https://www.the-cryosphere.net/10/2173/2016/tc-10-2173-2016.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-10-2173-2016 1994-0416 1994-0424 https://doaj.org/article/43e154d45fe24beaa19fffddc07f2430 |
op_doi |
https://doi.org/10.5194/tc-10-2173-2016 |
container_title |
The Cryosphere |
container_volume |
10 |
container_issue |
5 |
container_start_page |
2173 |
op_container_end_page |
2189 |
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1766189501286187008 |