Temporal dynamics of ikaite in experimental sea ice
Ikaite (CaCO3·6H2O) is a metastable phase of calcium carbonate that normally forms in a cold environment and/or under high pressure. Recently, ikaite crystals have been found in sea ice, and it has been suggested that their precipitation may play an important role in air–sea CO2 exchange in ice-cove...
Published in: | The Cryosphere |
---|---|
Main Authors: | , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2014
|
Subjects: | |
Online Access: | https://pure.au.dk/portal/da/publications/temporal-dynamics-of-ikaite-in-experimental-sea-ice(fb08aaf2-55ec-4fb4-a1cd-2ed51700ed3a).html https://doi.org/10.5194/tc-8-1469-2014 https://pure.au.dk/ws/files/82099771/Rysgaard_et_al_2014_Ikaite_SERF.pdf |
id |
ftuniaarhuspubl:oai:pure.atira.dk:publications/fb08aaf2-55ec-4fb4-a1cd-2ed51700ed3a |
---|---|
record_format |
openpolar |
spelling |
ftuniaarhuspubl:oai:pure.atira.dk:publications/fb08aaf2-55ec-4fb4-a1cd-2ed51700ed3a 2023-05-15T18:16:13+02:00 Temporal dynamics of ikaite in experimental sea ice Rysgaard, Søren Wang, F. Galley, R.J. Grimm, R. Notz, D. Lemes, M. Geilfus, Nicolas-Xavier Chaulk, A. Hare, A.A. Crabeck, O. Else, B.G.T. Campbell, K. Sørensen, Lise Lotte Sievers, Jakob Papakyriakou, T. 2014-08-08 application/pdf https://pure.au.dk/portal/da/publications/temporal-dynamics-of-ikaite-in-experimental-sea-ice(fb08aaf2-55ec-4fb4-a1cd-2ed51700ed3a).html https://doi.org/10.5194/tc-8-1469-2014 https://pure.au.dk/ws/files/82099771/Rysgaard_et_al_2014_Ikaite_SERF.pdf eng eng info:eu-repo/semantics/restrictedAccess Rysgaard , S , Wang , F , Galley , R J , Grimm , R , Notz , D , Lemes , M , Geilfus , N-X , Chaulk , A , Hare , A A , Crabeck , O , Else , B G T , Campbell , K , Sørensen , L L , Sievers , J & Papakyriakou , T 2014 , ' Temporal dynamics of ikaite in experimental sea ice ' , Cryosphere , vol. 8 , no. 4 , pp. 1469-1478 . https://doi.org/10.5194/tc-8-1469-2014 article 2014 ftuniaarhuspubl https://doi.org/10.5194/tc-8-1469-2014 2020-11-18T23:43:31Z Ikaite (CaCO3·6H2O) is a metastable phase of calcium carbonate that normally forms in a cold environment and/or under high pressure. Recently, ikaite crystals have been found in sea ice, and it has been suggested that their precipitation may play an important role in air–sea CO2 exchange in ice-covered seas. Little is known, however, of the spatial and temporal dynamics of ikaite in sea ice. Here we present evidence for highly dynamic ikaite precipitation and dissolution in sea ice grown at an outdoor pool of the Sea-ice Environmental Research Facility (SERF) in Manitoba, Canada. During the experiment, ikaite precipitated in sea ice when temperatures were below −4 C, creating three distinct zones of ikaite concentrations: (1) a millimeter-to-centimeter-thin surface layer containing frost flowers and brine skim with bulk ikaite concentrations of > 2000 μmol kg−1, (2) an internal layer with ikaite concentrations of 200–400 μmol kg−1, and (3) a bottom layer with ikaite concentrations of < 100 μmol kg−1. Snowfall events caused the sea ice to warm and ikaite crystals to dissolve. Manual removal of the snow cover allowed the sea ice to cool and brine salinities to increase, resulting in rapid ikaite precipitation. The observed ikaite concentrations were on the same order of magnitude as modeled by FREZCHEM, which further supports the notion that ikaite concentration in sea ice increases with decreasing temperature. Thus, varying snow conditions may play a key role in ikaite precipitation and dissolution in sea ice. This could have a major implication for CO2 exchange with the atmosphere and ocean that has not been accounted for previously. Article in Journal/Newspaper Sea ice Aarhus University: Research Canada The Cryosphere 8 4 1469 1478 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
description |
Ikaite (CaCO3·6H2O) is a metastable phase of calcium carbonate that normally forms in a cold environment and/or under high pressure. Recently, ikaite crystals have been found in sea ice, and it has been suggested that their precipitation may play an important role in air–sea CO2 exchange in ice-covered seas. Little is known, however, of the spatial and temporal dynamics of ikaite in sea ice. Here we present evidence for highly dynamic ikaite precipitation and dissolution in sea ice grown at an outdoor pool of the Sea-ice Environmental Research Facility (SERF) in Manitoba, Canada. During the experiment, ikaite precipitated in sea ice when temperatures were below −4 C, creating three distinct zones of ikaite concentrations: (1) a millimeter-to-centimeter-thin surface layer containing frost flowers and brine skim with bulk ikaite concentrations of > 2000 μmol kg−1, (2) an internal layer with ikaite concentrations of 200–400 μmol kg−1, and (3) a bottom layer with ikaite concentrations of < 100 μmol kg−1. Snowfall events caused the sea ice to warm and ikaite crystals to dissolve. Manual removal of the snow cover allowed the sea ice to cool and brine salinities to increase, resulting in rapid ikaite precipitation. The observed ikaite concentrations were on the same order of magnitude as modeled by FREZCHEM, which further supports the notion that ikaite concentration in sea ice increases with decreasing temperature. Thus, varying snow conditions may play a key role in ikaite precipitation and dissolution in sea ice. This could have a major implication for CO2 exchange with the atmosphere and ocean that has not been accounted for previously. |
format |
Article in Journal/Newspaper |
author |
Rysgaard, Søren Wang, F. Galley, R.J. Grimm, R. Notz, D. Lemes, M. Geilfus, Nicolas-Xavier Chaulk, A. Hare, A.A. Crabeck, O. Else, B.G.T. Campbell, K. Sørensen, Lise Lotte Sievers, Jakob Papakyriakou, T. |
spellingShingle |
Rysgaard, Søren Wang, F. Galley, R.J. Grimm, R. Notz, D. Lemes, M. Geilfus, Nicolas-Xavier Chaulk, A. Hare, A.A. Crabeck, O. Else, B.G.T. Campbell, K. Sørensen, Lise Lotte Sievers, Jakob Papakyriakou, T. Temporal dynamics of ikaite in experimental sea ice |
author_facet |
Rysgaard, Søren Wang, F. Galley, R.J. Grimm, R. Notz, D. Lemes, M. Geilfus, Nicolas-Xavier Chaulk, A. Hare, A.A. Crabeck, O. Else, B.G.T. Campbell, K. Sørensen, Lise Lotte Sievers, Jakob Papakyriakou, T. |
author_sort |
Rysgaard, Søren |
title |
Temporal dynamics of ikaite in experimental sea ice |
title_short |
Temporal dynamics of ikaite in experimental sea ice |
title_full |
Temporal dynamics of ikaite in experimental sea ice |
title_fullStr |
Temporal dynamics of ikaite in experimental sea ice |
title_full_unstemmed |
Temporal dynamics of ikaite in experimental sea ice |
title_sort |
temporal dynamics of ikaite in experimental sea ice |
publishDate |
2014 |
url |
https://pure.au.dk/portal/da/publications/temporal-dynamics-of-ikaite-in-experimental-sea-ice(fb08aaf2-55ec-4fb4-a1cd-2ed51700ed3a).html https://doi.org/10.5194/tc-8-1469-2014 https://pure.au.dk/ws/files/82099771/Rysgaard_et_al_2014_Ikaite_SERF.pdf |
geographic |
Canada |
geographic_facet |
Canada |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
Rysgaard , S , Wang , F , Galley , R J , Grimm , R , Notz , D , Lemes , M , Geilfus , N-X , Chaulk , A , Hare , A A , Crabeck , O , Else , B G T , Campbell , K , Sørensen , L L , Sievers , J & Papakyriakou , T 2014 , ' Temporal dynamics of ikaite in experimental sea ice ' , Cryosphere , vol. 8 , no. 4 , pp. 1469-1478 . https://doi.org/10.5194/tc-8-1469-2014 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.5194/tc-8-1469-2014 |
container_title |
The Cryosphere |
container_volume |
8 |
container_issue |
4 |
container_start_page |
1469 |
op_container_end_page |
1478 |
_version_ |
1766189686061006848 |