Unraveling the Biogeochemical Drivers of Aragonite Saturation State in Baffin Bay:Insights From the West Greenland Continental Shelf
This study investigates the biogeochemical drivers of aragonite saturation state (Ω Ar ) in Baffin Bay, with a focus on the relatively undersampled west Greenland shelf. Our findings reveal two main depth-dependant processes controlling the spatial distribution of Ω Ar in Baffin Bay; within the uppe...
Published in: | Journal of Geophysical Research: Oceans |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2024
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Online Access: | https://pure.au.dk/portal/en/publications/f17306e1-979b-4be2-92e7-7c944b005ef1 https://doi.org/10.1029/2024JC021122 http://www.scopus.com/inward/record.url?scp=85201793090&partnerID=8YFLogxK |
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ftuniaarhuspubl:oai:pure.atira.dk:publications/f17306e1-979b-4be2-92e7-7c944b005ef1 2024-09-15T17:56:56+00:00 Unraveling the Biogeochemical Drivers of Aragonite Saturation State in Baffin Bay:Insights From the West Greenland Continental Shelf Burgers, Tonya M. Azetsu-Scott, Kumiko Myers, Paul G. Else, Brent G.T. Miller, Lisa A. Rysgaard, Søren Chan, Wayne Tremblay, Jean Éric Papakyriakou, Tim 2024-08 https://pure.au.dk/portal/en/publications/f17306e1-979b-4be2-92e7-7c944b005ef1 https://doi.org/10.1029/2024JC021122 http://www.scopus.com/inward/record.url?scp=85201793090&partnerID=8YFLogxK eng eng https://pure.au.dk/portal/en/publications/f17306e1-979b-4be2-92e7-7c944b005ef1 info:eu-repo/semantics/openAccess Burgers , T M , Azetsu-Scott , K , Myers , P G , Else , B G T , Miller , L A , Rysgaard , S , Chan , W , Tremblay , J É & Papakyriakou , T 2024 , ' Unraveling the Biogeochemical Drivers of Aragonite Saturation State in Baffin Bay : Insights From the West Greenland Continental Shelf ' , Journal of Geophysical Research: Oceans , vol. 129 , no. 8 , e2024JC021122 . https://doi.org/10.1029/2024JC021122 carbon dynamics chemical oceanography climate change ocean acidification ocean biogeochemistry article 2024 ftuniaarhuspubl https://doi.org/10.1029/2024JC021122 2024-09-05T00:45:07Z This study investigates the biogeochemical drivers of aragonite saturation state (Ω Ar ) in Baffin Bay, with a focus on the relatively undersampled west Greenland shelf. Our findings reveal two main depth-dependant processes controlling the spatial distribution of Ω Ar in Baffin Bay; within the upper 200 m, lower Ω Ar coincides with increasing fractions of Arctic-outflow waters, while below 200 m organic matter respiration decreases Ω Ar . A temporal analysis comparing historical measurements from 1997 and 2004 with our 2019 data set reveals a significant decrease in the Ω Ar of Arctic-outflow waters, coinciding with reduced total alkalinity (TA). However, no discernible anthropogenic ocean acidification signal is identified. Significant Arctic water fractions (20%–40%) are found to be present on the west Greenland shelf, associated with reduced TA and Ω Ar . A numerical modeling simulation incorporating a passive tracer demonstrates that periodic changes in wind direction lead to a switch from onshore to offshore Ekman transport along the Baffin Island current, transporting Arctic waters toward the west Greenland shelf. This challenges the conventional understanding of Baffin Bay's circulation and underscores the need for further research on the region's physical oceanography. Based on salinity-TA relationships, surface waters on the west Greenland shelf have a significantly lower meteoric TA end-member compared to waters of the Baffin Island Current in western Baffin Bay. The low eastern TA freshwater end-member agrees well with recent glacial meltwater TA measurements, suggesting that glacial meltwater is the main freshwater source to surface waters on the west Greenland shelf. Article in Journal/Newspaper Baffin Bay Baffin Bay Baffin Island Baffin Climate change Greenland Ocean acidification Aarhus University: Research Journal of Geophysical Research: Oceans 129 8 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
carbon dynamics chemical oceanography climate change ocean acidification ocean biogeochemistry |
spellingShingle |
carbon dynamics chemical oceanography climate change ocean acidification ocean biogeochemistry Burgers, Tonya M. Azetsu-Scott, Kumiko Myers, Paul G. Else, Brent G.T. Miller, Lisa A. Rysgaard, Søren Chan, Wayne Tremblay, Jean Éric Papakyriakou, Tim Unraveling the Biogeochemical Drivers of Aragonite Saturation State in Baffin Bay:Insights From the West Greenland Continental Shelf |
topic_facet |
carbon dynamics chemical oceanography climate change ocean acidification ocean biogeochemistry |
description |
This study investigates the biogeochemical drivers of aragonite saturation state (Ω Ar ) in Baffin Bay, with a focus on the relatively undersampled west Greenland shelf. Our findings reveal two main depth-dependant processes controlling the spatial distribution of Ω Ar in Baffin Bay; within the upper 200 m, lower Ω Ar coincides with increasing fractions of Arctic-outflow waters, while below 200 m organic matter respiration decreases Ω Ar . A temporal analysis comparing historical measurements from 1997 and 2004 with our 2019 data set reveals a significant decrease in the Ω Ar of Arctic-outflow waters, coinciding with reduced total alkalinity (TA). However, no discernible anthropogenic ocean acidification signal is identified. Significant Arctic water fractions (20%–40%) are found to be present on the west Greenland shelf, associated with reduced TA and Ω Ar . A numerical modeling simulation incorporating a passive tracer demonstrates that periodic changes in wind direction lead to a switch from onshore to offshore Ekman transport along the Baffin Island current, transporting Arctic waters toward the west Greenland shelf. This challenges the conventional understanding of Baffin Bay's circulation and underscores the need for further research on the region's physical oceanography. Based on salinity-TA relationships, surface waters on the west Greenland shelf have a significantly lower meteoric TA end-member compared to waters of the Baffin Island Current in western Baffin Bay. The low eastern TA freshwater end-member agrees well with recent glacial meltwater TA measurements, suggesting that glacial meltwater is the main freshwater source to surface waters on the west Greenland shelf. |
format |
Article in Journal/Newspaper |
author |
Burgers, Tonya M. Azetsu-Scott, Kumiko Myers, Paul G. Else, Brent G.T. Miller, Lisa A. Rysgaard, Søren Chan, Wayne Tremblay, Jean Éric Papakyriakou, Tim |
author_facet |
Burgers, Tonya M. Azetsu-Scott, Kumiko Myers, Paul G. Else, Brent G.T. Miller, Lisa A. Rysgaard, Søren Chan, Wayne Tremblay, Jean Éric Papakyriakou, Tim |
author_sort |
Burgers, Tonya M. |
title |
Unraveling the Biogeochemical Drivers of Aragonite Saturation State in Baffin Bay:Insights From the West Greenland Continental Shelf |
title_short |
Unraveling the Biogeochemical Drivers of Aragonite Saturation State in Baffin Bay:Insights From the West Greenland Continental Shelf |
title_full |
Unraveling the Biogeochemical Drivers of Aragonite Saturation State in Baffin Bay:Insights From the West Greenland Continental Shelf |
title_fullStr |
Unraveling the Biogeochemical Drivers of Aragonite Saturation State in Baffin Bay:Insights From the West Greenland Continental Shelf |
title_full_unstemmed |
Unraveling the Biogeochemical Drivers of Aragonite Saturation State in Baffin Bay:Insights From the West Greenland Continental Shelf |
title_sort |
unraveling the biogeochemical drivers of aragonite saturation state in baffin bay:insights from the west greenland continental shelf |
publishDate |
2024 |
url |
https://pure.au.dk/portal/en/publications/f17306e1-979b-4be2-92e7-7c944b005ef1 https://doi.org/10.1029/2024JC021122 http://www.scopus.com/inward/record.url?scp=85201793090&partnerID=8YFLogxK |
genre |
Baffin Bay Baffin Bay Baffin Island Baffin Climate change Greenland Ocean acidification |
genre_facet |
Baffin Bay Baffin Bay Baffin Island Baffin Climate change Greenland Ocean acidification |
op_source |
Burgers , T M , Azetsu-Scott , K , Myers , P G , Else , B G T , Miller , L A , Rysgaard , S , Chan , W , Tremblay , J É & Papakyriakou , T 2024 , ' Unraveling the Biogeochemical Drivers of Aragonite Saturation State in Baffin Bay : Insights From the West Greenland Continental Shelf ' , Journal of Geophysical Research: Oceans , vol. 129 , no. 8 , e2024JC021122 . https://doi.org/10.1029/2024JC021122 |
op_relation |
https://pure.au.dk/portal/en/publications/f17306e1-979b-4be2-92e7-7c944b005ef1 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2024JC021122 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
129 |
container_issue |
8 |
_version_ |
1810433122006728704 |