Seasonal variation of CaCO 3 saturation state in bottom water of a biological hotspot in the Chukchi Sea, Arctic Ocean
Distribution of calcium carbonate saturation state (Ω) was observed in the Chukchi Sea in autumn 2012 and early summer 2013. Ω in bottom water ranged from 0.3 to 2.0 for aragonite and from 0.5 to 3.2 for calcite in 2012. In 2013, Ω in bottom water was 1.1–2.8 for aragonite and 1.7–4.4 for calcite. A...
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ftdoajarticles:oai:doaj.org/article:576bc4f69c014d3f87878e7b82cbc3e7 2023-05-15T15:08:57+02:00 Seasonal variation of CaCO 3 saturation state in bottom water of a biological hotspot in the Chukchi Sea, Arctic Ocean M. Yamamoto-Kawai T. Mifune T. Kikuchi S. Nishino 2016-11-01T00:00:00Z https://doi.org/10.5194/bg-13-6155-2016 https://doaj.org/article/576bc4f69c014d3f87878e7b82cbc3e7 EN eng Copernicus Publications https://www.biogeosciences.net/13/6155/2016/bg-13-6155-2016.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-13-6155-2016 1726-4170 1726-4189 https://doaj.org/article/576bc4f69c014d3f87878e7b82cbc3e7 Biogeosciences, Vol 13, Pp 6155-6169 (2016) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2016 ftdoajarticles https://doi.org/10.5194/bg-13-6155-2016 2022-12-31T12:44:16Z Distribution of calcium carbonate saturation state (Ω) was observed in the Chukchi Sea in autumn 2012 and early summer 2013. Ω in bottom water ranged from 0.3 to 2.0 for aragonite and from 0.5 to 3.2 for calcite in 2012. In 2013, Ω in bottom water was 1.1–2.8 for aragonite and 1.7–4.4 for calcite. Aragonite and calcite undersaturation was found in high productivity regions in autumn 2012 but not in early summer 2013. Comparison with other parameters has indicated that biological processes – respiration and photosynthesis – are major factors controlling the regional and temporal variability of Ω. From these ship-based observations, we have obtained empirical equations to reconstruct Ω from temperature, salinity and apparent oxygen utilization. Using 2-year-round mooring data and these equations, we have reconstructed seasonal variation of Ω in bottom water in Hope Valley, a biological hotspot in the southern Chukchi Sea. Estimated Ω was high in spring and early summer, decreased in later summer, and remained relatively low in winter. Calculations indicated a possibility that bottom water could have been undersaturated for aragonite on an intermittent basis even in the pre-industrial period, and that anthropogenic CO 2 has extended the period of aragonite undersaturation to more than 2-fold longer by now. Article in Journal/Newspaper Arctic Arctic Ocean Chukchi Chukchi Sea Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean Chukchi Sea Hope Valley ENVELOPE(-171.000,-171.000,68.833,68.833) Biogeosciences 13 22 6155 6169 |
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Directory of Open Access Journals: DOAJ Articles |
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English |
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 M. Yamamoto-Kawai T. Mifune T. Kikuchi S. Nishino Seasonal variation of CaCO 3 saturation state in bottom water of a biological hotspot in the Chukchi Sea, Arctic Ocean |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Distribution of calcium carbonate saturation state (Ω) was observed in the Chukchi Sea in autumn 2012 and early summer 2013. Ω in bottom water ranged from 0.3 to 2.0 for aragonite and from 0.5 to 3.2 for calcite in 2012. In 2013, Ω in bottom water was 1.1–2.8 for aragonite and 1.7–4.4 for calcite. Aragonite and calcite undersaturation was found in high productivity regions in autumn 2012 but not in early summer 2013. Comparison with other parameters has indicated that biological processes – respiration and photosynthesis – are major factors controlling the regional and temporal variability of Ω. From these ship-based observations, we have obtained empirical equations to reconstruct Ω from temperature, salinity and apparent oxygen utilization. Using 2-year-round mooring data and these equations, we have reconstructed seasonal variation of Ω in bottom water in Hope Valley, a biological hotspot in the southern Chukchi Sea. Estimated Ω was high in spring and early summer, decreased in later summer, and remained relatively low in winter. Calculations indicated a possibility that bottom water could have been undersaturated for aragonite on an intermittent basis even in the pre-industrial period, and that anthropogenic CO 2 has extended the period of aragonite undersaturation to more than 2-fold longer by now. |
format |
Article in Journal/Newspaper |
author |
M. Yamamoto-Kawai T. Mifune T. Kikuchi S. Nishino |
author_facet |
M. Yamamoto-Kawai T. Mifune T. Kikuchi S. Nishino |
author_sort |
M. Yamamoto-Kawai |
title |
Seasonal variation of CaCO 3 saturation state in bottom water of a biological hotspot in the Chukchi Sea, Arctic Ocean |
title_short |
Seasonal variation of CaCO 3 saturation state in bottom water of a biological hotspot in the Chukchi Sea, Arctic Ocean |
title_full |
Seasonal variation of CaCO 3 saturation state in bottom water of a biological hotspot in the Chukchi Sea, Arctic Ocean |
title_fullStr |
Seasonal variation of CaCO 3 saturation state in bottom water of a biological hotspot in the Chukchi Sea, Arctic Ocean |
title_full_unstemmed |
Seasonal variation of CaCO 3 saturation state in bottom water of a biological hotspot in the Chukchi Sea, Arctic Ocean |
title_sort |
seasonal variation of caco 3 saturation state in bottom water of a biological hotspot in the chukchi sea, arctic ocean |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/bg-13-6155-2016 https://doaj.org/article/576bc4f69c014d3f87878e7b82cbc3e7 |
long_lat |
ENVELOPE(-171.000,-171.000,68.833,68.833) |
geographic |
Arctic Arctic Ocean Chukchi Sea Hope Valley |
geographic_facet |
Arctic Arctic Ocean Chukchi Sea Hope Valley |
genre |
Arctic Arctic Ocean Chukchi Chukchi Sea |
genre_facet |
Arctic Arctic Ocean Chukchi Chukchi Sea |
op_source |
Biogeosciences, Vol 13, Pp 6155-6169 (2016) |
op_relation |
https://www.biogeosciences.net/13/6155/2016/bg-13-6155-2016.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-13-6155-2016 1726-4170 1726-4189 https://doaj.org/article/576bc4f69c014d3f87878e7b82cbc3e7 |
op_doi |
https://doi.org/10.5194/bg-13-6155-2016 |
container_title |
Biogeosciences |
container_volume |
13 |
container_issue |
22 |
container_start_page |
6155 |
op_container_end_page |
6169 |
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1766340207198601216 |