Deep Ocean Storage of Heat and CO 2 in the Fram Strait, Arctic Ocean During the Last Glacial Period
Funder: Tromsø Research Foundation : A31720 <jats:title>Abstract</jats:title><jats:p>The Fram Strait is the only deep gateway between the Arctic Ocean and the Nordic Seas and thus is a key area to study past changes in ocean circulation and the marine carbon cycle. Here, we study d...
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ftunivcam:oai:www.repository.cam.ac.uk:1810/326033 2024-02-04T09:58:02+01:00 Deep Ocean Storage of Heat and CO 2 in the Fram Strait, Arctic Ocean During the Last Glacial Period Ezat, MM Rasmussen, TL Hain, MP Greaves, M Rae, JWB Zamelczyk, K Marchitto, TM Szidat, S Skinner, LC 2021-07-29T06:31:33Z application/pdf text/xml https://www.repository.cam.ac.uk/handle/1810/326033 https://doi.org/10.17863/CAM.73490 en eng eng American Geophysical Union (AGU) http://dx.doi.org/10.1029/2021pa004216 Paleoceanography and Paleoclimatology https://www.repository.cam.ac.uk/handle/1810/326033 doi:10.17863/CAM.73490 Benthic foraminiferal element Ca benthic foraminiferal delta O-18 climate change the Fram Strait the Last Glacial the Nordic Seas Article 2021 ftunivcam https://doi.org/10.17863/CAM.73490 2024-01-11T23:22:37Z Funder: Tromsø Research Foundation : A31720 <jats:title>Abstract</jats:title><jats:p>The Fram Strait is the only deep gateway between the Arctic Ocean and the Nordic Seas and thus is a key area to study past changes in ocean circulation and the marine carbon cycle. Here, we study deep ocean temperature, δ<jats:sup>18</jats:sup>O, carbonate chemistry (i.e., carbonate ion concentration [CO<jats:sub>3</jats:sub><jats:sup>2−</jats:sup>]), and nutrient content in the Fram Strait during the late glacial (35,000–19,000 years BP) and the Holocene based on benthic foraminiferal geochemistry and carbon cycle modeling. Our results indicate a thickening of Atlantic water penetrating into the northern Nordic Seas, forming a subsurface Atlantic intermediate water layer reaching to at least ∼2,600 m water depth during most of the late glacial period. The recirculating Atlantic layer was characterized by relatively high [CO<jats:sub>3</jats:sub><jats:sup>2−</jats:sup>] and low δ<jats:sup>13</jats:sup>C during the late glacial, and provides evidence for a Nordic Seas source to the glacial North Atlantic intermediate water flowing at 2,000–3,000 m water depth, most likely via the Denmark Strait. In addition, we discuss evidence for enhanced terrestrial carbon input to the Nordic Seas at ∼23.5 ka. Comparing our δ<jats:sup>13</jats:sup>C and qualitative [CO<jats:sub>3</jats:sub><jats:sup>2−</jats:sup>] records with results of carbon cycle box modeling suggests that the total terrestrial CO<jats:sub>2</jats:sub> release during this carbon input event was low, slow, or directly to the atmosphere.</jats:p> Article in Journal/Newspaper Arctic Arctic Ocean Climate change Denmark Strait Foraminifera* Fram Strait Nordic Seas North Atlantic Tromsø Apollo - University of Cambridge Repository Arctic Arctic Ocean Tromsø |
institution |
Open Polar |
collection |
Apollo - University of Cambridge Repository |
op_collection_id |
ftunivcam |
language |
English |
topic |
Benthic foraminiferal element Ca benthic foraminiferal delta O-18 climate change the Fram Strait the Last Glacial the Nordic Seas |
spellingShingle |
Benthic foraminiferal element Ca benthic foraminiferal delta O-18 climate change the Fram Strait the Last Glacial the Nordic Seas Ezat, MM Rasmussen, TL Hain, MP Greaves, M Rae, JWB Zamelczyk, K Marchitto, TM Szidat, S Skinner, LC Deep Ocean Storage of Heat and CO 2 in the Fram Strait, Arctic Ocean During the Last Glacial Period |
topic_facet |
Benthic foraminiferal element Ca benthic foraminiferal delta O-18 climate change the Fram Strait the Last Glacial the Nordic Seas |
description |
Funder: Tromsø Research Foundation : A31720 <jats:title>Abstract</jats:title><jats:p>The Fram Strait is the only deep gateway between the Arctic Ocean and the Nordic Seas and thus is a key area to study past changes in ocean circulation and the marine carbon cycle. Here, we study deep ocean temperature, δ<jats:sup>18</jats:sup>O, carbonate chemistry (i.e., carbonate ion concentration [CO<jats:sub>3</jats:sub><jats:sup>2−</jats:sup>]), and nutrient content in the Fram Strait during the late glacial (35,000–19,000 years BP) and the Holocene based on benthic foraminiferal geochemistry and carbon cycle modeling. Our results indicate a thickening of Atlantic water penetrating into the northern Nordic Seas, forming a subsurface Atlantic intermediate water layer reaching to at least ∼2,600 m water depth during most of the late glacial period. The recirculating Atlantic layer was characterized by relatively high [CO<jats:sub>3</jats:sub><jats:sup>2−</jats:sup>] and low δ<jats:sup>13</jats:sup>C during the late glacial, and provides evidence for a Nordic Seas source to the glacial North Atlantic intermediate water flowing at 2,000–3,000 m water depth, most likely via the Denmark Strait. In addition, we discuss evidence for enhanced terrestrial carbon input to the Nordic Seas at ∼23.5 ka. Comparing our δ<jats:sup>13</jats:sup>C and qualitative [CO<jats:sub>3</jats:sub><jats:sup>2−</jats:sup>] records with results of carbon cycle box modeling suggests that the total terrestrial CO<jats:sub>2</jats:sub> release during this carbon input event was low, slow, or directly to the atmosphere.</jats:p> |
format |
Article in Journal/Newspaper |
author |
Ezat, MM Rasmussen, TL Hain, MP Greaves, M Rae, JWB Zamelczyk, K Marchitto, TM Szidat, S Skinner, LC |
author_facet |
Ezat, MM Rasmussen, TL Hain, MP Greaves, M Rae, JWB Zamelczyk, K Marchitto, TM Szidat, S Skinner, LC |
author_sort |
Ezat, MM |
title |
Deep Ocean Storage of Heat and CO 2 in the Fram Strait, Arctic Ocean During the Last Glacial Period |
title_short |
Deep Ocean Storage of Heat and CO 2 in the Fram Strait, Arctic Ocean During the Last Glacial Period |
title_full |
Deep Ocean Storage of Heat and CO 2 in the Fram Strait, Arctic Ocean During the Last Glacial Period |
title_fullStr |
Deep Ocean Storage of Heat and CO 2 in the Fram Strait, Arctic Ocean During the Last Glacial Period |
title_full_unstemmed |
Deep Ocean Storage of Heat and CO 2 in the Fram Strait, Arctic Ocean During the Last Glacial Period |
title_sort |
deep ocean storage of heat and co 2 in the fram strait, arctic ocean during the last glacial period |
publisher |
American Geophysical Union (AGU) |
publishDate |
2021 |
url |
https://www.repository.cam.ac.uk/handle/1810/326033 https://doi.org/10.17863/CAM.73490 |
geographic |
Arctic Arctic Ocean Tromsø |
geographic_facet |
Arctic Arctic Ocean Tromsø |
genre |
Arctic Arctic Ocean Climate change Denmark Strait Foraminifera* Fram Strait Nordic Seas North Atlantic Tromsø |
genre_facet |
Arctic Arctic Ocean Climate change Denmark Strait Foraminifera* Fram Strait Nordic Seas North Atlantic Tromsø |
op_relation |
https://www.repository.cam.ac.uk/handle/1810/326033 doi:10.17863/CAM.73490 |
op_doi |
https://doi.org/10.17863/CAM.73490 |
_version_ |
1789962365715873792 |