Insights into carbonate environmental conditions in the Chukchi Sea
Healthy Arctic marine ecosystems are essential to the food security and sovereignty, culture, and wellbeing of Indigenous Peoples in the Arctic. At the same time, Arctic marine ecosystems are highly susceptible to impacts of climate change and ocean acidification. While increasing ocean and air temp...
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2024
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ftdoajarticles:oai:doaj.org/article:328162aeaa7448a19373890d3266b93e 2024-09-15T17:52:29+00:00 Insights into carbonate environmental conditions in the Chukchi Sea C. Hauri B. Irving S. Dupont R. Pagés D. D. W. Hauser S. L. Danielson 2024-03-01T00:00:00Z https://doi.org/10.5194/bg-21-1135-2024 https://doaj.org/article/328162aeaa7448a19373890d3266b93e EN eng Copernicus Publications https://bg.copernicus.org/articles/21/1135/2024/bg-21-1135-2024.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-21-1135-2024 1726-4170 1726-4189 https://doaj.org/article/328162aeaa7448a19373890d3266b93e Biogeosciences, Vol 21, Pp 1135-1159 (2024) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2024 ftdoajarticles https://doi.org/10.5194/bg-21-1135-2024 2024-08-05T17:49:51Z Healthy Arctic marine ecosystems are essential to the food security and sovereignty, culture, and wellbeing of Indigenous Peoples in the Arctic. At the same time, Arctic marine ecosystems are highly susceptible to impacts of climate change and ocean acidification. While increasing ocean and air temperatures and melting sea ice act as direct stressors on the ecosystem, they also indirectly enhance ocean acidification, accelerating the associated changes in the inorganic carbon system. Yet, much is to be learned about the current state and variability of the inorganic carbon system in remote, high-latitude oceans. Here, we present time series (2016–2020) of pH and the partial pressure of carbon dioxide ( p CO 2 ) from the northeast Chukchi Sea continental shelf. The Chukchi Ecosystem Observatory includes a suite of subsurface year-round moorings sited amid a biological hotspot that is characterized by high primary productivity and a rich benthic food web that in turn supports coastal Iñupiat, whales, ice seals, walrus ( Odobenus rosmarus ), and Arctic cod ( Boreogadus saida ). Our observations suggest that near-bottom waters (33 m depth, 13 m above the seafloor) are a high carbon dioxide and low pH and aragonite saturation state ( Ω arag ) environment in summer and fall, when organic material from the highly productive summer remineralizes. During this time, Ω arag can be as low as 0.4. In winter, when the site was covered by sea ice, pH was <8 and Ω arag remained undersaturated under the sea ice. There were only two short seasonal periods with relatively higher pH and Ω arag , which we term ocean acidification relaxation events. In spring, high primary production from sea ice algae and phytoplankton blooms led to spikes in pH (pH > 8) and aragonite oversaturation. In late fall, strong wind-driven mixing events that delivered low-CO 2 surface water to the shelf also led to events with elevated pH and Ω arag . Given the recent observations of high rates of ocean acidification and a sudden and dramatic shift ... Article in Journal/Newspaper Arctic cod Boreogadus saida Chukchi Chukchi Sea Climate change ice algae Ocean acidification Odobenus rosmarus Phytoplankton Sea ice walrus* Directory of Open Access Journals: DOAJ Articles Biogeosciences 21 5 1135 1159 |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
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topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
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Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 C. Hauri B. Irving S. Dupont R. Pagés D. D. W. Hauser S. L. Danielson Insights into carbonate environmental conditions in the Chukchi Sea |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Healthy Arctic marine ecosystems are essential to the food security and sovereignty, culture, and wellbeing of Indigenous Peoples in the Arctic. At the same time, Arctic marine ecosystems are highly susceptible to impacts of climate change and ocean acidification. While increasing ocean and air temperatures and melting sea ice act as direct stressors on the ecosystem, they also indirectly enhance ocean acidification, accelerating the associated changes in the inorganic carbon system. Yet, much is to be learned about the current state and variability of the inorganic carbon system in remote, high-latitude oceans. Here, we present time series (2016–2020) of pH and the partial pressure of carbon dioxide ( p CO 2 ) from the northeast Chukchi Sea continental shelf. The Chukchi Ecosystem Observatory includes a suite of subsurface year-round moorings sited amid a biological hotspot that is characterized by high primary productivity and a rich benthic food web that in turn supports coastal Iñupiat, whales, ice seals, walrus ( Odobenus rosmarus ), and Arctic cod ( Boreogadus saida ). Our observations suggest that near-bottom waters (33 m depth, 13 m above the seafloor) are a high carbon dioxide and low pH and aragonite saturation state ( Ω arag ) environment in summer and fall, when organic material from the highly productive summer remineralizes. During this time, Ω arag can be as low as 0.4. In winter, when the site was covered by sea ice, pH was <8 and Ω arag remained undersaturated under the sea ice. There were only two short seasonal periods with relatively higher pH and Ω arag , which we term ocean acidification relaxation events. In spring, high primary production from sea ice algae and phytoplankton blooms led to spikes in pH (pH > 8) and aragonite oversaturation. In late fall, strong wind-driven mixing events that delivered low-CO 2 surface water to the shelf also led to events with elevated pH and Ω arag . Given the recent observations of high rates of ocean acidification and a sudden and dramatic shift ... |
format |
Article in Journal/Newspaper |
author |
C. Hauri B. Irving S. Dupont R. Pagés D. D. W. Hauser S. L. Danielson |
author_facet |
C. Hauri B. Irving S. Dupont R. Pagés D. D. W. Hauser S. L. Danielson |
author_sort |
C. Hauri |
title |
Insights into carbonate environmental conditions in the Chukchi Sea |
title_short |
Insights into carbonate environmental conditions in the Chukchi Sea |
title_full |
Insights into carbonate environmental conditions in the Chukchi Sea |
title_fullStr |
Insights into carbonate environmental conditions in the Chukchi Sea |
title_full_unstemmed |
Insights into carbonate environmental conditions in the Chukchi Sea |
title_sort |
insights into carbonate environmental conditions in the chukchi sea |
publisher |
Copernicus Publications |
publishDate |
2024 |
url |
https://doi.org/10.5194/bg-21-1135-2024 https://doaj.org/article/328162aeaa7448a19373890d3266b93e |
genre |
Arctic cod Boreogadus saida Chukchi Chukchi Sea Climate change ice algae Ocean acidification Odobenus rosmarus Phytoplankton Sea ice walrus* |
genre_facet |
Arctic cod Boreogadus saida Chukchi Chukchi Sea Climate change ice algae Ocean acidification Odobenus rosmarus Phytoplankton Sea ice walrus* |
op_source |
Biogeosciences, Vol 21, Pp 1135-1159 (2024) |
op_relation |
https://bg.copernicus.org/articles/21/1135/2024/bg-21-1135-2024.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-21-1135-2024 1726-4170 1726-4189 https://doaj.org/article/328162aeaa7448a19373890d3266b93e |
op_doi |
https://doi.org/10.5194/bg-21-1135-2024 |
container_title |
Biogeosciences |
container_volume |
21 |
container_issue |
5 |
container_start_page |
1135 |
op_container_end_page |
1159 |
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1810294500983046144 |