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Ikaite crystals in melting sea ice – implications for <i>p</i>CO<sub>2</sub> and pH levels in Arctic surface waters

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Zeitschriftentitel: The Cryosphere
Personen und Körperschaften: Rysgaard, S., Glud, R. N., Lennert, K., Cooper, M., Halden, N., Leakey, R. J. G., Hawthorne, F. C., Barber, D.
In: The Cryosphere, 6, 2012, 4, S. 901-908
Format: E-Article
Sprache: Englisch
veröffentlicht:
Copernicus GmbH
Schlagwörter:
Earth-Surface Processes
Water Science and Technology
author_facet Rysgaard, S.
Glud, R. N.
Lennert, K.
Cooper, M.
Halden, N.
Leakey, R. J. G.
Hawthorne, F. C.
Barber, D.
Rysgaard, S.
Glud, R. N.
Lennert, K.
Cooper, M.
Halden, N.
Leakey, R. J. G.
Hawthorne, F. C.
Barber, D.
author Rysgaard, S.
Glud, R. N.
Lennert, K.
Cooper, M.
Halden, N.
Leakey, R. J. G.
Hawthorne, F. C.
Barber, D.
spellingShingle Rysgaard, S.
Glud, R. N.
Lennert, K.
Cooper, M.
Halden, N.
Leakey, R. J. G.
Hawthorne, F. C.
Barber, D.
The Cryosphere
Ikaite crystals in melting sea ice – implications for <i>p</i>CO<sub>2</sub> and pH levels in Arctic surface waters
Earth-Surface Processes
Water Science and Technology
author_sort rysgaard, s.
spelling Rysgaard, S. Glud, R. N. Lennert, K. Cooper, M. Halden, N. Leakey, R. J. G. Hawthorne, F. C. Barber, D. 1994-0424 Copernicus GmbH Earth-Surface Processes Water Science and Technology http://dx.doi.org/10.5194/tc-6-901-2012 <jats:p>Abstract. A major issue of Arctic marine science is to understand whether the Arctic Ocean is, or will be, a source or sink for air–sea CO2 exchange. This has been complicated by the recent discoveries of ikaite (a polymorph of CaCO3·6H2O) in Arctic and Antarctic sea ice, which indicate that multiple chemical transformations occur in sea ice with a possible effect on CO2 and pH conditions in surface waters. Here, we report on biogeochemical conditions, microscopic examinations and x-ray diffraction analysis of single crystals from a melting 1.7 km2 (0.5–1 m thick) drifting ice floe in the Fram Strait during summer. Our findings show that ikaite crystals are present throughout the sea ice but with larger crystals appearing in the upper ice layers. Ikaite crystals placed at elevated temperatures disintegrated into smaller crystallites and dissolved. During our field campaign in late June, melt reduced the ice floe thickness by 0.2 m per week and resulted in an estimated 3.8 ppm decrease of pCO2 in the ocean surface mixed layer. This corresponds to an air–sea CO2 uptake of 10.6 mmol m−2 sea ice d−1 or to 3.3 ton km−2 ice floe week−1. This is markedly higher than the estimated primary production within the ice floe of 0.3–1.3 mmol m−2 sea ice d−1. Finally, the presence of ikaite in sea ice and the dissolution of the mineral during melting of the sea ice and mixing of the melt water into the surface oceanic mixed layer accounted for half of the estimated pCO2 uptake. </jats:p> Ikaite crystals in melting sea ice – implications for &lt;i&gt;p&lt;/i&gt;CO&lt;sub&gt;2&lt;/sub&gt; and pH levels in Arctic surface waters The Cryosphere
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title Ikaite crystals in melting sea ice – implications for &lt;i&gt;p&lt;/i&gt;CO&lt;sub&gt;2&lt;/sub&gt; and pH levels in Arctic surface waters
title_unstemmed Ikaite crystals in melting sea ice – implications for &lt;i&gt;p&lt;/i&gt;CO&lt;sub&gt;2&lt;/sub&gt; and pH levels in Arctic surface waters
title_full Ikaite crystals in melting sea ice – implications for &lt;i&gt;p&lt;/i&gt;CO&lt;sub&gt;2&lt;/sub&gt; and pH levels in Arctic surface waters
title_fullStr Ikaite crystals in melting sea ice – implications for &lt;i&gt;p&lt;/i&gt;CO&lt;sub&gt;2&lt;/sub&gt; and pH levels in Arctic surface waters
title_full_unstemmed Ikaite crystals in melting sea ice – implications for &lt;i&gt;p&lt;/i&gt;CO&lt;sub&gt;2&lt;/sub&gt; and pH levels in Arctic surface waters
title_short Ikaite crystals in melting sea ice – implications for &lt;i&gt;p&lt;/i&gt;CO&lt;sub&gt;2&lt;/sub&gt; and pH levels in Arctic surface waters
title_sort ikaite crystals in melting sea ice – implications for &lt;i&gt;p&lt;/i&gt;co&lt;sub&gt;2&lt;/sub&gt; and ph levels in arctic surface waters
topic Earth-Surface Processes
Water Science and Technology
url http://dx.doi.org/10.5194/tc-6-901-2012
publishDate 2012
physical 901-908
description <jats:p>Abstract. A major issue of Arctic marine science is to understand whether the Arctic Ocean is, or will be, a source or sink for air–sea CO2 exchange. This has been complicated by the recent discoveries of ikaite (a polymorph of CaCO3·6H2O) in Arctic and Antarctic sea ice, which indicate that multiple chemical transformations occur in sea ice with a possible effect on CO2 and pH conditions in surface waters. Here, we report on biogeochemical conditions, microscopic examinations and x-ray diffraction analysis of single crystals from a melting 1.7 km2 (0.5–1 m thick) drifting ice floe in the Fram Strait during summer. Our findings show that ikaite crystals are present throughout the sea ice but with larger crystals appearing in the upper ice layers. Ikaite crystals placed at elevated temperatures disintegrated into smaller crystallites and dissolved. During our field campaign in late June, melt reduced the ice floe thickness by 0.2 m per week and resulted in an estimated 3.8 ppm decrease of pCO2 in the ocean surface mixed layer. This corresponds to an air–sea CO2 uptake of 10.6 mmol m−2 sea ice d−1 or to 3.3 ton km−2 ice floe week−1. This is markedly higher than the estimated primary production within the ice floe of 0.3–1.3 mmol m−2 sea ice d−1. Finally, the presence of ikaite in sea ice and the dissolution of the mineral during melting of the sea ice and mixing of the melt water into the surface oceanic mixed layer accounted for half of the estimated pCO2 uptake. </jats:p>
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author Rysgaard, S., Glud, R. N., Lennert, K., Cooper, M., Halden, N., Leakey, R. J. G., Hawthorne, F. C., Barber, D.
author_facet Rysgaard, S., Glud, R. N., Lennert, K., Cooper, M., Halden, N., Leakey, R. J. G., Hawthorne, F. C., Barber, D., Rysgaard, S., Glud, R. N., Lennert, K., Cooper, M., Halden, N., Leakey, R. J. G., Hawthorne, F. C., Barber, D.
author_sort rysgaard, s.
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description <jats:p>Abstract. A major issue of Arctic marine science is to understand whether the Arctic Ocean is, or will be, a source or sink for air–sea CO2 exchange. This has been complicated by the recent discoveries of ikaite (a polymorph of CaCO3·6H2O) in Arctic and Antarctic sea ice, which indicate that multiple chemical transformations occur in sea ice with a possible effect on CO2 and pH conditions in surface waters. Here, we report on biogeochemical conditions, microscopic examinations and x-ray diffraction analysis of single crystals from a melting 1.7 km2 (0.5–1 m thick) drifting ice floe in the Fram Strait during summer. Our findings show that ikaite crystals are present throughout the sea ice but with larger crystals appearing in the upper ice layers. Ikaite crystals placed at elevated temperatures disintegrated into smaller crystallites and dissolved. During our field campaign in late June, melt reduced the ice floe thickness by 0.2 m per week and resulted in an estimated 3.8 ppm decrease of pCO2 in the ocean surface mixed layer. This corresponds to an air–sea CO2 uptake of 10.6 mmol m−2 sea ice d−1 or to 3.3 ton km−2 ice floe week−1. This is markedly higher than the estimated primary production within the ice floe of 0.3–1.3 mmol m−2 sea ice d−1. Finally, the presence of ikaite in sea ice and the dissolution of the mineral during melting of the sea ice and mixing of the melt water into the surface oceanic mixed layer accounted for half of the estimated pCO2 uptake. </jats:p>
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spelling Rysgaard, S. Glud, R. N. Lennert, K. Cooper, M. Halden, N. Leakey, R. J. G. Hawthorne, F. C. Barber, D. 1994-0424 Copernicus GmbH Earth-Surface Processes Water Science and Technology http://dx.doi.org/10.5194/tc-6-901-2012 <jats:p>Abstract. A major issue of Arctic marine science is to understand whether the Arctic Ocean is, or will be, a source or sink for air–sea CO2 exchange. This has been complicated by the recent discoveries of ikaite (a polymorph of CaCO3·6H2O) in Arctic and Antarctic sea ice, which indicate that multiple chemical transformations occur in sea ice with a possible effect on CO2 and pH conditions in surface waters. Here, we report on biogeochemical conditions, microscopic examinations and x-ray diffraction analysis of single crystals from a melting 1.7 km2 (0.5–1 m thick) drifting ice floe in the Fram Strait during summer. Our findings show that ikaite crystals are present throughout the sea ice but with larger crystals appearing in the upper ice layers. Ikaite crystals placed at elevated temperatures disintegrated into smaller crystallites and dissolved. During our field campaign in late June, melt reduced the ice floe thickness by 0.2 m per week and resulted in an estimated 3.8 ppm decrease of pCO2 in the ocean surface mixed layer. This corresponds to an air–sea CO2 uptake of 10.6 mmol m−2 sea ice d−1 or to 3.3 ton km−2 ice floe week−1. This is markedly higher than the estimated primary production within the ice floe of 0.3–1.3 mmol m−2 sea ice d−1. Finally, the presence of ikaite in sea ice and the dissolution of the mineral during melting of the sea ice and mixing of the melt water into the surface oceanic mixed layer accounted for half of the estimated pCO2 uptake. </jats:p> Ikaite crystals in melting sea ice – implications for &lt;i&gt;p&lt;/i&gt;CO&lt;sub&gt;2&lt;/sub&gt; and pH levels in Arctic surface waters The Cryosphere
spellingShingle Rysgaard, S., Glud, R. N., Lennert, K., Cooper, M., Halden, N., Leakey, R. J. G., Hawthorne, F. C., Barber, D., The Cryosphere, Ikaite crystals in melting sea ice – implications for &lt;i&gt;p&lt;/i&gt;CO&lt;sub&gt;2&lt;/sub&gt; and pH levels in Arctic surface waters, Earth-Surface Processes, Water Science and Technology
title Ikaite crystals in melting sea ice – implications for &lt;i&gt;p&lt;/i&gt;CO&lt;sub&gt;2&lt;/sub&gt; and pH levels in Arctic surface waters
title_full Ikaite crystals in melting sea ice – implications for &lt;i&gt;p&lt;/i&gt;CO&lt;sub&gt;2&lt;/sub&gt; and pH levels in Arctic surface waters
title_fullStr Ikaite crystals in melting sea ice – implications for &lt;i&gt;p&lt;/i&gt;CO&lt;sub&gt;2&lt;/sub&gt; and pH levels in Arctic surface waters
title_full_unstemmed Ikaite crystals in melting sea ice – implications for &lt;i&gt;p&lt;/i&gt;CO&lt;sub&gt;2&lt;/sub&gt; and pH levels in Arctic surface waters
title_short Ikaite crystals in melting sea ice – implications for &lt;i&gt;p&lt;/i&gt;CO&lt;sub&gt;2&lt;/sub&gt; and pH levels in Arctic surface waters
title_sort ikaite crystals in melting sea ice – implications for &lt;i&gt;p&lt;/i&gt;co&lt;sub&gt;2&lt;/sub&gt; and ph levels in arctic surface waters
title_unstemmed Ikaite crystals in melting sea ice – implications for &lt;i&gt;p&lt;/i&gt;CO&lt;sub&gt;2&lt;/sub&gt; and pH levels in Arctic surface waters
topic Earth-Surface Processes, Water Science and Technology
url http://dx.doi.org/10.5194/tc-6-901-2012