Deep ocean storage of heat and CO2 in the Fram Strait, Arctic Ocean during the last glacial period
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, δ18O, carbonate chemistry (i.e., carbonate ion concentration [CO32−]), and nutri...
Published in: | Paleoceanography and Paleoclimatology |
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Online Access: | https://hdl.handle.net/10037/22013 https://doi.org/10.1029/2021PA004216 |
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ftunivtroemsoe:oai:munin.uit.no:10037/22013 2023-05-15T14:24:25+02:00 Deep ocean storage of heat and CO2 in the Fram Strait, Arctic Ocean during the last glacial period Ezat, Mohamed Rasmussen, Tine Lander Hain, Mathis P. Greaves, Mervyn Rae, James W.B. Zamelczyk, Katarzyna Marchitto, Thomas M. Szidat, Sönke Skinner, Luke C. 2021-07-19 https://hdl.handle.net/10037/22013 https://doi.org/10.1029/2021PA004216 eng eng Wiley Paleoceanography and Paleoclimatology Norges forskningsråd: 223259 EC/FP7: 274429 Tromsø forskningsstiftelse: ARCLIM info:eu-repo/grantAgreement/EC/?/274429?/?/?/?/ info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/ Ezat M, Rasmussen TLR, Hain, Greaves, Rae, Zamelczyk K, Marchitto TM, Szidat S, Skinner LC. Deep ocean storage of heat and CO2 in the Fram Strait, Arctic Ocean during the last glacial period. Paleoceanography and Paleoclimatology. 2021;36(8) FRIDAID 1923003 doi:10.1029/2021PA004216 2572-4517 2572-4525 https://hdl.handle.net/10037/22013 openAccess Copyright 2021 The Author(s) VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 Journal article Tidsskriftartikkel Peer reviewed publishedVersion 2021 ftunivtroemsoe https://doi.org/10.1029/2021PA004216 2021-08-18T22:53:41Z 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, δ18O, carbonate chemistry (i.e., carbonate ion concentration [CO32−]), 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 [CO32−] and low δ13C 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 δ13C and qualitative [CO32−] records with results of carbon cycle box modeling suggests that the total terrestrial CO2 release during this carbon input event was low, slow, or directly to the atmosphere. Article in Journal/Newspaper Arctic Arctic Arctic Ocean Denmark Strait Foraminifera* Fram Strait Nordic Seas North Atlantic University of Tromsø: Munin Open Research Archive Arctic Arctic Ocean Paleoceanography and Paleoclimatology 36 8 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 |
spellingShingle |
VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 Ezat, Mohamed Rasmussen, Tine Lander Hain, Mathis P. Greaves, Mervyn Rae, James W.B. Zamelczyk, Katarzyna Marchitto, Thomas M. Szidat, Sönke Skinner, Luke C. Deep ocean storage of heat and CO2 in the Fram Strait, Arctic Ocean during the last glacial period |
topic_facet |
VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 |
description |
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, δ18O, carbonate chemistry (i.e., carbonate ion concentration [CO32−]), 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 [CO32−] and low δ13C 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 δ13C and qualitative [CO32−] records with results of carbon cycle box modeling suggests that the total terrestrial CO2 release during this carbon input event was low, slow, or directly to the atmosphere. |
format |
Article in Journal/Newspaper |
author |
Ezat, Mohamed Rasmussen, Tine Lander Hain, Mathis P. Greaves, Mervyn Rae, James W.B. Zamelczyk, Katarzyna Marchitto, Thomas M. Szidat, Sönke Skinner, Luke C. |
author_facet |
Ezat, Mohamed Rasmussen, Tine Lander Hain, Mathis P. Greaves, Mervyn Rae, James W.B. Zamelczyk, Katarzyna Marchitto, Thomas M. Szidat, Sönke Skinner, Luke C. |
author_sort |
Ezat, Mohamed |
title |
Deep ocean storage of heat and CO2 in the Fram Strait, Arctic Ocean during the last glacial period |
title_short |
Deep ocean storage of heat and CO2 in the Fram Strait, Arctic Ocean during the last glacial period |
title_full |
Deep ocean storage of heat and CO2 in the Fram Strait, Arctic Ocean during the last glacial period |
title_fullStr |
Deep ocean storage of heat and CO2 in the Fram Strait, Arctic Ocean during the last glacial period |
title_full_unstemmed |
Deep ocean storage of heat and CO2 in the Fram Strait, Arctic Ocean during the last glacial period |
title_sort |
deep ocean storage of heat and co2 in the fram strait, arctic ocean during the last glacial period |
publisher |
Wiley |
publishDate |
2021 |
url |
https://hdl.handle.net/10037/22013 https://doi.org/10.1029/2021PA004216 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Arctic Ocean Denmark Strait Foraminifera* Fram Strait Nordic Seas North Atlantic |
genre_facet |
Arctic Arctic Arctic Ocean Denmark Strait Foraminifera* Fram Strait Nordic Seas North Atlantic |
op_relation |
Paleoceanography and Paleoclimatology Norges forskningsråd: 223259 EC/FP7: 274429 Tromsø forskningsstiftelse: ARCLIM info:eu-repo/grantAgreement/EC/?/274429?/?/?/?/ info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/ Ezat M, Rasmussen TLR, Hain, Greaves, Rae, Zamelczyk K, Marchitto TM, Szidat S, Skinner LC. Deep ocean storage of heat and CO2 in the Fram Strait, Arctic Ocean during the last glacial period. Paleoceanography and Paleoclimatology. 2021;36(8) FRIDAID 1923003 doi:10.1029/2021PA004216 2572-4517 2572-4525 https://hdl.handle.net/10037/22013 |
op_rights |
openAccess Copyright 2021 The Author(s) |
op_doi |
https://doi.org/10.1029/2021PA004216 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
36 |
container_issue |
8 |
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1766296832296615936 |