Changes in column inventories of carbon and oxygen in the Atlantic Ocean
Increasing concentrations of dissolved inorganic carbon (DIC) in the interior ocean are expected as a direct consequence of increasing concentrations of CO 2 in the atmosphere. This extra DIC is often referred to as anthropogenic carbon (C ant ), and its inventory, or increase rate, in the interior...
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ftdoajarticles:oai:doaj.org/article:567a6574bfa44e88ad9804f307b18016 2023-05-15T17:32:38+02:00 Changes in column inventories of carbon and oxygen in the Atlantic Ocean T. Tanhua R. F. Keeling 2012-11-01T00:00:00Z https://doi.org/10.5194/bg-9-4819-2012 https://doaj.org/article/567a6574bfa44e88ad9804f307b18016 EN eng Copernicus Publications http://www.biogeosciences.net/9/4819/2012/bg-9-4819-2012.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-9-4819-2012 1726-4170 1726-4189 https://doaj.org/article/567a6574bfa44e88ad9804f307b18016 Biogeosciences, Vol 9, Iss 11, Pp 4819-4833 (2012) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2012 ftdoajarticles https://doi.org/10.5194/bg-9-4819-2012 2022-12-31T14:35:47Z Increasing concentrations of dissolved inorganic carbon (DIC) in the interior ocean are expected as a direct consequence of increasing concentrations of CO 2 in the atmosphere. This extra DIC is often referred to as anthropogenic carbon (C ant ), and its inventory, or increase rate, in the interior ocean has previously been estimated by a multitude of observational approaches. Each of these methods is associated with hard to test assumptions since C ant cannot be directly observed. Results from a simpler concept with fewer assumptions applied to the Atlantic Ocean are reported on here using two large data collections of carbon relevant bottle data. The change in column inventory on decadal time scales, i.e. the storage rate, of DIC, respiration compensated DIC and oxygen is calculated for the Atlantic Ocean. We report storage rates and the confidence intervals of the mean trend at the 95% level (CI), reflecting the mean trend but not considering potential biasing effects of the spatial and temporal sampling. For the whole Atlantic Ocean the mean trends for DIC and oxygen are non-zero at the 95% confidence level: DIC: 0.86 (CI: 0.72–1.00) and oxygen: −0.24 (CI: −0.41–(−0.07)) mol m −2 yr −1 . For oxygen, the whole Atlantic trend is dominated by the subpolar North Atlantic, whereas for other regions the O 2 trends are not significant. The storage rates are similar to changes found by other studies, although with large uncertainty. For the subpolar North Atlantic the storage rates show significant temporal and regional variation of all variables. This seems to be due to variations in the prevalence of subsurface water masses with different DIC and oxygen concentrations leading to sometimes different signs of storage rates for DIC compared to published C ant estimates. This study suggest that accurate assessment of the uptake of CO 2 by the oceans will require accounting not only for processes that influence C ant but also additional processes that modify CO 2 storage. Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles Biogeosciences 9 11 4819 4833 |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 T. Tanhua R. F. Keeling Changes in column inventories of carbon and oxygen in the Atlantic Ocean |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Increasing concentrations of dissolved inorganic carbon (DIC) in the interior ocean are expected as a direct consequence of increasing concentrations of CO 2 in the atmosphere. This extra DIC is often referred to as anthropogenic carbon (C ant ), and its inventory, or increase rate, in the interior ocean has previously been estimated by a multitude of observational approaches. Each of these methods is associated with hard to test assumptions since C ant cannot be directly observed. Results from a simpler concept with fewer assumptions applied to the Atlantic Ocean are reported on here using two large data collections of carbon relevant bottle data. The change in column inventory on decadal time scales, i.e. the storage rate, of DIC, respiration compensated DIC and oxygen is calculated for the Atlantic Ocean. We report storage rates and the confidence intervals of the mean trend at the 95% level (CI), reflecting the mean trend but not considering potential biasing effects of the spatial and temporal sampling. For the whole Atlantic Ocean the mean trends for DIC and oxygen are non-zero at the 95% confidence level: DIC: 0.86 (CI: 0.72–1.00) and oxygen: −0.24 (CI: −0.41–(−0.07)) mol m −2 yr −1 . For oxygen, the whole Atlantic trend is dominated by the subpolar North Atlantic, whereas for other regions the O 2 trends are not significant. The storage rates are similar to changes found by other studies, although with large uncertainty. For the subpolar North Atlantic the storage rates show significant temporal and regional variation of all variables. This seems to be due to variations in the prevalence of subsurface water masses with different DIC and oxygen concentrations leading to sometimes different signs of storage rates for DIC compared to published C ant estimates. This study suggest that accurate assessment of the uptake of CO 2 by the oceans will require accounting not only for processes that influence C ant but also additional processes that modify CO 2 storage. |
format |
Article in Journal/Newspaper |
author |
T. Tanhua R. F. Keeling |
author_facet |
T. Tanhua R. F. Keeling |
author_sort |
T. Tanhua |
title |
Changes in column inventories of carbon and oxygen in the Atlantic Ocean |
title_short |
Changes in column inventories of carbon and oxygen in the Atlantic Ocean |
title_full |
Changes in column inventories of carbon and oxygen in the Atlantic Ocean |
title_fullStr |
Changes in column inventories of carbon and oxygen in the Atlantic Ocean |
title_full_unstemmed |
Changes in column inventories of carbon and oxygen in the Atlantic Ocean |
title_sort |
changes in column inventories of carbon and oxygen in the atlantic ocean |
publisher |
Copernicus Publications |
publishDate |
2012 |
url |
https://doi.org/10.5194/bg-9-4819-2012 https://doaj.org/article/567a6574bfa44e88ad9804f307b18016 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Biogeosciences, Vol 9, Iss 11, Pp 4819-4833 (2012) |
op_relation |
http://www.biogeosciences.net/9/4819/2012/bg-9-4819-2012.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-9-4819-2012 1726-4170 1726-4189 https://doaj.org/article/567a6574bfa44e88ad9804f307b18016 |
op_doi |
https://doi.org/10.5194/bg-9-4819-2012 |
container_title |
Biogeosciences |
container_volume |
9 |
container_issue |
11 |
container_start_page |
4819 |
op_container_end_page |
4833 |
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1766130845275389952 |