Coastal acidification induced by biogeochemical processes driven by sea-ice melt in the western Arctic ocean
To better understand the extent of acidification in the Arctic Ocean, we present pH measurements collected along a shelf-slope-basin transect from the Chukchi Sea shelf to the Chukchi Abyssal Plain (CAP) in the western Arctic Ocean during the summer 2010 Chinese Arctic National Research Expedition (...
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ftnipr:oai:nipr.repo.nii.ac.jp:00015978 2023-05-15T14:45:35+02:00 Coastal acidification induced by biogeochemical processes driven by sea-ice melt in the western Arctic ocean 2020-03 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=15978 http://id.nii.ac.jp/1291/00015868/ en eng https://doi.org/10.1016/j.polar.2020.100504 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=15978 http://id.nii.ac.jp/1291/00015868/ Polar Science, 23, 100504(2020-03) 18739652 pH Acidification Sea-ice loss Arctic ocean Journal Article 2020 ftnipr https://doi.org/10.1016/j.polar.2020.100504 2022-12-03T19:43:16Z To better understand the extent of acidification in the Arctic Ocean, we present pH measurements collected along a shelf-slope-basin transect from the Chukchi Sea shelf to the Chukchi Abyssal Plain (CAP) in the western Arctic Ocean during the summer 2010 Chinese Arctic National Research Expedition (CHINARE) cruise. We observed low pH values in the Chukchi Sea shelf bottom waters (~30 m-bottom) and CAP upper haloline layer (UHL) (100–200 m). In the shelf bottom waters, the pH values were 7.66–8.13, about 0.07–0.68 pH units lower than the surface values of 8.20–8.24. In the CAP subsurface waters, the pH values were 7.85–7.98, about 0.08–0.31 pH units lower than the surface values of 8.20–8.24. Biogeochemical model simulations suggest that remineralized CO2 driven by sea-ice loss is primarily responsible for the low pH values in the bottom waters of the Chukchi Sea (shelf) and the UHL waters of the CAP (basin). Recent sea-ice melt enhanced organic matter production in surface waters and subsequent supported the increased microbial respiration of organic matter in bottom waters. Moreover, low pH bottom waters were flushed into the UHL during winter to sustain the low pH characteristics in the subsurface basin layers. In addition, our simplified model suggests that the thermodynamic effect of pH is small. However, increasing temperature significantly increased aragonite saturation (Ωarag) which slowed down the speed of acidification. Article in Journal/Newspaper Arctic Arctic Ocean Chukchi Chukchi Sea Polar Science Polar Science Sea ice National Institute of Polar Research Repository, Japan Arctic Arctic Ocean Chukchi Sea Chukchi Abyssal Plain ENVELOPE(-171.192,-171.192,76.285,76.285) Polar Science 23 100504 |
institution |
Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
topic |
pH Acidification Sea-ice loss Arctic ocean |
spellingShingle |
pH Acidification Sea-ice loss Arctic ocean Coastal acidification induced by biogeochemical processes driven by sea-ice melt in the western Arctic ocean |
topic_facet |
pH Acidification Sea-ice loss Arctic ocean |
description |
To better understand the extent of acidification in the Arctic Ocean, we present pH measurements collected along a shelf-slope-basin transect from the Chukchi Sea shelf to the Chukchi Abyssal Plain (CAP) in the western Arctic Ocean during the summer 2010 Chinese Arctic National Research Expedition (CHINARE) cruise. We observed low pH values in the Chukchi Sea shelf bottom waters (~30 m-bottom) and CAP upper haloline layer (UHL) (100–200 m). In the shelf bottom waters, the pH values were 7.66–8.13, about 0.07–0.68 pH units lower than the surface values of 8.20–8.24. In the CAP subsurface waters, the pH values were 7.85–7.98, about 0.08–0.31 pH units lower than the surface values of 8.20–8.24. Biogeochemical model simulations suggest that remineralized CO2 driven by sea-ice loss is primarily responsible for the low pH values in the bottom waters of the Chukchi Sea (shelf) and the UHL waters of the CAP (basin). Recent sea-ice melt enhanced organic matter production in surface waters and subsequent supported the increased microbial respiration of organic matter in bottom waters. Moreover, low pH bottom waters were flushed into the UHL during winter to sustain the low pH characteristics in the subsurface basin layers. In addition, our simplified model suggests that the thermodynamic effect of pH is small. However, increasing temperature significantly increased aragonite saturation (Ωarag) which slowed down the speed of acidification. |
format |
Article in Journal/Newspaper |
title |
Coastal acidification induced by biogeochemical processes driven by sea-ice melt in the western Arctic ocean |
title_short |
Coastal acidification induced by biogeochemical processes driven by sea-ice melt in the western Arctic ocean |
title_full |
Coastal acidification induced by biogeochemical processes driven by sea-ice melt in the western Arctic ocean |
title_fullStr |
Coastal acidification induced by biogeochemical processes driven by sea-ice melt in the western Arctic ocean |
title_full_unstemmed |
Coastal acidification induced by biogeochemical processes driven by sea-ice melt in the western Arctic ocean |
title_sort |
coastal acidification induced by biogeochemical processes driven by sea-ice melt in the western arctic ocean |
publishDate |
2020 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=15978 http://id.nii.ac.jp/1291/00015868/ |
long_lat |
ENVELOPE(-171.192,-171.192,76.285,76.285) |
geographic |
Arctic Arctic Ocean Chukchi Sea Chukchi Abyssal Plain |
geographic_facet |
Arctic Arctic Ocean Chukchi Sea Chukchi Abyssal Plain |
genre |
Arctic Arctic Ocean Chukchi Chukchi Sea Polar Science Polar Science Sea ice |
genre_facet |
Arctic Arctic Ocean Chukchi Chukchi Sea Polar Science Polar Science Sea ice |
op_relation |
https://doi.org/10.1016/j.polar.2020.100504 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=15978 http://id.nii.ac.jp/1291/00015868/ Polar Science, 23, 100504(2020-03) 18739652 |
op_doi |
https://doi.org/10.1016/j.polar.2020.100504 |
container_title |
Polar Science |
container_volume |
23 |
container_start_page |
100504 |
_version_ |
1766316979893829632 |