Multidecadal accumulation of anthropogenic and remineralized dissolved inorganic carbon along the Extended Ellett Line in the northeast Atlantic Ocean
Marine carbonate chemistry measurements have been carried out annually since 2009 during UK research cruises along the Extended Ellett Line (EEL), a hydrographic transect in the northeast Atlantic Ocean. The EEL intersects several water masses that are key to the global thermohaline circulation, and...
Published in: | Global Biogeochemical Cycles |
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Language: | English |
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AGU (American Geophysical Union)
2016
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Online Access: | https://oceanrep.geomar.de/id/eprint/32151/ https://oceanrep.geomar.de/id/eprint/32151/1/gbc20392.pdf https://doi.org/10.1002/2015GB005246 |
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ftoceanrep:oai:oceanrep.geomar.de:32151 2023-05-15T17:24:23+02:00 Multidecadal accumulation of anthropogenic and remineralized dissolved inorganic carbon along the Extended Ellett Line in the northeast Atlantic Ocean Humphreys, Matthew P. Griffiths, Alex M. Achterberg, Eric P. Holliday, N. Penny Rérolle, Victoire M. C. Menzel Barraqueta, Jan-Lukas Couldrey, Matthew P. Oliver, Kevin I. C. Hartman, Susan E. Esposito, Mario Boyce, Adrian J. 2016-02 text https://oceanrep.geomar.de/id/eprint/32151/ https://oceanrep.geomar.de/id/eprint/32151/1/gbc20392.pdf https://doi.org/10.1002/2015GB005246 en eng AGU (American Geophysical Union) Wiley https://oceanrep.geomar.de/id/eprint/32151/1/gbc20392.pdf Humphreys, M. P., Griffiths, A. M., Achterberg, E. P. , Holliday, N. P., Rérolle, V. M. C., Menzel Barraqueta, J. L. , Couldrey, M. P., Oliver, K. I. C., Hartman, S. E., Esposito, M. and Boyce, A. J. (2016) Multidecadal accumulation of anthropogenic and remineralized dissolved inorganic carbon along the Extended Ellett Line in the northeast Atlantic Ocean. Open Access Global Biogeochemical Cycles, 30 (2). pp. 293-310. DOI 10.1002/2015GB005246 <https://doi.org/10.1002/2015GB005246>. doi:10.1002/2015GB005246 cc_by_3.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2016 ftoceanrep https://doi.org/10.1002/2015GB005246 2023-04-07T15:25:02Z Marine carbonate chemistry measurements have been carried out annually since 2009 during UK research cruises along the Extended Ellett Line (EEL), a hydrographic transect in the northeast Atlantic Ocean. The EEL intersects several water masses that are key to the global thermohaline circulation, and therefore the cruises sample a region in which it is critical to monitor secular physical and biogeochemical changes. We have combined results from these EEL cruises with existing quality-controlled observational data syntheses to produce a hydrographic time series for the EEL from 1981 to 2013. This reveals multidecadal increases in dissolved inorganic carbon (DIC) throughout the water column, with a near-surface maximum rate of 1.800.45 mu molkg(-1)yr(-1). Anthropogenic CO2 accumulation was assessed, using simultaneous changes in apparent oxygen utilization (AOU) and total alkalinity (TA) as proxies for the biogeochemical processes that influence DIC. The stable carbon isotope composition of DIC (C-13(DIC)) was also determined and used as an independent test of our method. We calculated a volume-integrated anthropogenic CO2 accumulation rate of 2.80.4mgCm(-3)yr(-1) along the EEL, which is about double the global mean. The anthropogenic CO2 component accounts for only 316% of the total DIC increase. The remainder is derived from increased organic matter remineralization, which we attribute to the lateral redistribution of water masses that accompanies subpolar gyre contraction. Output from a general circulation ecosystem model demonstrates that spatiotemporal heterogeneity in the observations has not significantly biased our multidecadal rate of change calculations and indicates that the EEL observations have been tracking distal changes in the surrounding North Atlantic and Nordic Seas. Article in Journal/Newspaper Nordic Seas North Atlantic Northeast Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Global Biogeochemical Cycles 30 2 293 310 |
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Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
Marine carbonate chemistry measurements have been carried out annually since 2009 during UK research cruises along the Extended Ellett Line (EEL), a hydrographic transect in the northeast Atlantic Ocean. The EEL intersects several water masses that are key to the global thermohaline circulation, and therefore the cruises sample a region in which it is critical to monitor secular physical and biogeochemical changes. We have combined results from these EEL cruises with existing quality-controlled observational data syntheses to produce a hydrographic time series for the EEL from 1981 to 2013. This reveals multidecadal increases in dissolved inorganic carbon (DIC) throughout the water column, with a near-surface maximum rate of 1.800.45 mu molkg(-1)yr(-1). Anthropogenic CO2 accumulation was assessed, using simultaneous changes in apparent oxygen utilization (AOU) and total alkalinity (TA) as proxies for the biogeochemical processes that influence DIC. The stable carbon isotope composition of DIC (C-13(DIC)) was also determined and used as an independent test of our method. We calculated a volume-integrated anthropogenic CO2 accumulation rate of 2.80.4mgCm(-3)yr(-1) along the EEL, which is about double the global mean. The anthropogenic CO2 component accounts for only 316% of the total DIC increase. The remainder is derived from increased organic matter remineralization, which we attribute to the lateral redistribution of water masses that accompanies subpolar gyre contraction. Output from a general circulation ecosystem model demonstrates that spatiotemporal heterogeneity in the observations has not significantly biased our multidecadal rate of change calculations and indicates that the EEL observations have been tracking distal changes in the surrounding North Atlantic and Nordic Seas. |
format |
Article in Journal/Newspaper |
author |
Humphreys, Matthew P. Griffiths, Alex M. Achterberg, Eric P. Holliday, N. Penny Rérolle, Victoire M. C. Menzel Barraqueta, Jan-Lukas Couldrey, Matthew P. Oliver, Kevin I. C. Hartman, Susan E. Esposito, Mario Boyce, Adrian J. |
spellingShingle |
Humphreys, Matthew P. Griffiths, Alex M. Achterberg, Eric P. Holliday, N. Penny Rérolle, Victoire M. C. Menzel Barraqueta, Jan-Lukas Couldrey, Matthew P. Oliver, Kevin I. C. Hartman, Susan E. Esposito, Mario Boyce, Adrian J. Multidecadal accumulation of anthropogenic and remineralized dissolved inorganic carbon along the Extended Ellett Line in the northeast Atlantic Ocean |
author_facet |
Humphreys, Matthew P. Griffiths, Alex M. Achterberg, Eric P. Holliday, N. Penny Rérolle, Victoire M. C. Menzel Barraqueta, Jan-Lukas Couldrey, Matthew P. Oliver, Kevin I. C. Hartman, Susan E. Esposito, Mario Boyce, Adrian J. |
author_sort |
Humphreys, Matthew P. |
title |
Multidecadal accumulation of anthropogenic and remineralized dissolved inorganic carbon along the Extended Ellett Line in the northeast Atlantic Ocean |
title_short |
Multidecadal accumulation of anthropogenic and remineralized dissolved inorganic carbon along the Extended Ellett Line in the northeast Atlantic Ocean |
title_full |
Multidecadal accumulation of anthropogenic and remineralized dissolved inorganic carbon along the Extended Ellett Line in the northeast Atlantic Ocean |
title_fullStr |
Multidecadal accumulation of anthropogenic and remineralized dissolved inorganic carbon along the Extended Ellett Line in the northeast Atlantic Ocean |
title_full_unstemmed |
Multidecadal accumulation of anthropogenic and remineralized dissolved inorganic carbon along the Extended Ellett Line in the northeast Atlantic Ocean |
title_sort |
multidecadal accumulation of anthropogenic and remineralized dissolved inorganic carbon along the extended ellett line in the northeast atlantic ocean |
publisher |
AGU (American Geophysical Union) |
publishDate |
2016 |
url |
https://oceanrep.geomar.de/id/eprint/32151/ https://oceanrep.geomar.de/id/eprint/32151/1/gbc20392.pdf https://doi.org/10.1002/2015GB005246 |
genre |
Nordic Seas North Atlantic Northeast Atlantic |
genre_facet |
Nordic Seas North Atlantic Northeast Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/32151/1/gbc20392.pdf Humphreys, M. P., Griffiths, A. M., Achterberg, E. P. , Holliday, N. P., Rérolle, V. M. C., Menzel Barraqueta, J. L. , Couldrey, M. P., Oliver, K. I. C., Hartman, S. E., Esposito, M. and Boyce, A. J. (2016) Multidecadal accumulation of anthropogenic and remineralized dissolved inorganic carbon along the Extended Ellett Line in the northeast Atlantic Ocean. Open Access Global Biogeochemical Cycles, 30 (2). pp. 293-310. DOI 10.1002/2015GB005246 <https://doi.org/10.1002/2015GB005246>. doi:10.1002/2015GB005246 |
op_rights |
cc_by_3.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1002/2015GB005246 |
container_title |
Global Biogeochemical Cycles |
container_volume |
30 |
container_issue |
2 |
container_start_page |
293 |
op_container_end_page |
310 |
_version_ |
1766115368322990080 |