Inorganic carbon and pH levels in the Rockall Trough 1991–2010

The accumulation of anthropogenic CO2 in the oceans is altering seawater carbonate chemistry. Investigation and monitoring of the carbonate parameters is therefore necessary to understand potential impacts on ocean ecosystems. Total alkalinity (AT) and dissolved inorganic carbon (CT) were sampled ac...

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Published in:Deep Sea Research Part I: Oceanographic Research Papers
Main Authors: McGrath, Triona, Kivimäe, Caroline, Tanhua, Toste, Cave, Rachel R., McGovern, Evin
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier 2012
Subjects:
Online Access:https://oceanrep.geomar.de/id/eprint/19323/
https://oceanrep.geomar.de/id/eprint/19323/1/1-s2.0-S0967063712001185-main.pdf
https://doi.org/10.1016/j.dsr.2012.05.011
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spelling ftoceanrep:oai:oceanrep.geomar.de:19323 2023-05-15T17:06:15+02:00 Inorganic carbon and pH levels in the Rockall Trough 1991–2010 McGrath, Triona Kivimäe, Caroline Tanhua, Toste Cave, Rachel R. McGovern, Evin 2012 text https://oceanrep.geomar.de/id/eprint/19323/ https://oceanrep.geomar.de/id/eprint/19323/1/1-s2.0-S0967063712001185-main.pdf https://doi.org/10.1016/j.dsr.2012.05.011 en eng Elsevier https://oceanrep.geomar.de/id/eprint/19323/1/1-s2.0-S0967063712001185-main.pdf McGrath, T., Kivimäe, C., Tanhua, T. , Cave, R. R. and McGovern, E. (2012) Inorganic carbon and pH levels in the Rockall Trough 1991–2010. Deep Sea Research Part I: Oceanographic Research Papers, 68 . pp. 79-91. DOI 10.1016/j.dsr.2012.05.011 <https://doi.org/10.1016/j.dsr.2012.05.011>. doi:10.1016/j.dsr.2012.05.011 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2012 ftoceanrep https://doi.org/10.1016/j.dsr.2012.05.011 2023-04-07T15:06:24Z The accumulation of anthropogenic CO2 in the oceans is altering seawater carbonate chemistry. Investigation and monitoring of the carbonate parameters is therefore necessary to understand potential impacts on ocean ecosystems. Total alkalinity (AT) and dissolved inorganic carbon (CT) were sampled across the Rockall Trough in Feb 2009 (CE0903) and Feb 2010 (CE10002) as part of a baseline study of inorganic carbon chemistry in Irish shelf waters. The results have been compared with data from WOCE surveys A01E (Sept 1991), A01 (Dec 1994), AR24 (Nov 1996) and A24 (June 1997). The 2009 and 2010 datasets provide a snapshot of the biogeochemical parameters which can act as a baseline of inorganic carbon and acidity levels in surface waters of the Rockall Trough in late winter for future comparison since previous surveys in the area have been affected by biological activity. The dataset also offers the possibility to compare decadal changes in subsurface waters. The temporal evolution of anthropogenic carbon (Delta C-ant) between the 1990s and 2010 was evaluated using two separate methods; (i) a comparison of the concentrations of C-T between surveys, after correcting it for remineralisation of organic material and formation and dissolution of calcium carbonate (Delta CT-abio) and (ii) an extended Multiple Linear Regression was used to calculate the Delta C-ant (Delta C-ant(eMLR)). There was an increase in Delta CT-abio and Delta C-ant(eMLR) of 18 +/- 4 mu mol kg(-1) and 19 +/- 4 mu mol kg(-1), respectively, in the subsurface waters between 1991 and 2010, equivalent to a decrease of 0.040 +/- 0.003 pH units over the 19 year period. There was an increase in both Delta CT-abio and Delta C(ant)e(mLR) of 8 +/- 4 mu mol kg(-1) in Labrador Sea Water (LSW) in the Trough between 1991 and 2010, and LSW has acidified by 0.029 +/- 0.002 pH units over the same time period. A reduction in calcite and aragonite saturation states was observed, which may have implications for calcifying organisms in the region Article in Journal/Newspaper Labrador Sea OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Rockall Trough ENVELOPE(-15.036,-15.036,53.825,53.825) Deep Sea Research Part I: Oceanographic Research Papers 68 79 91
institution Open Polar
collection OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
op_collection_id ftoceanrep
language English
description The accumulation of anthropogenic CO2 in the oceans is altering seawater carbonate chemistry. Investigation and monitoring of the carbonate parameters is therefore necessary to understand potential impacts on ocean ecosystems. Total alkalinity (AT) and dissolved inorganic carbon (CT) were sampled across the Rockall Trough in Feb 2009 (CE0903) and Feb 2010 (CE10002) as part of a baseline study of inorganic carbon chemistry in Irish shelf waters. The results have been compared with data from WOCE surveys A01E (Sept 1991), A01 (Dec 1994), AR24 (Nov 1996) and A24 (June 1997). The 2009 and 2010 datasets provide a snapshot of the biogeochemical parameters which can act as a baseline of inorganic carbon and acidity levels in surface waters of the Rockall Trough in late winter for future comparison since previous surveys in the area have been affected by biological activity. The dataset also offers the possibility to compare decadal changes in subsurface waters. The temporal evolution of anthropogenic carbon (Delta C-ant) between the 1990s and 2010 was evaluated using two separate methods; (i) a comparison of the concentrations of C-T between surveys, after correcting it for remineralisation of organic material and formation and dissolution of calcium carbonate (Delta CT-abio) and (ii) an extended Multiple Linear Regression was used to calculate the Delta C-ant (Delta C-ant(eMLR)). There was an increase in Delta CT-abio and Delta C-ant(eMLR) of 18 +/- 4 mu mol kg(-1) and 19 +/- 4 mu mol kg(-1), respectively, in the subsurface waters between 1991 and 2010, equivalent to a decrease of 0.040 +/- 0.003 pH units over the 19 year period. There was an increase in both Delta CT-abio and Delta C(ant)e(mLR) of 8 +/- 4 mu mol kg(-1) in Labrador Sea Water (LSW) in the Trough between 1991 and 2010, and LSW has acidified by 0.029 +/- 0.002 pH units over the same time period. A reduction in calcite and aragonite saturation states was observed, which may have implications for calcifying organisms in the region
format Article in Journal/Newspaper
author McGrath, Triona
Kivimäe, Caroline
Tanhua, Toste
Cave, Rachel R.
McGovern, Evin
spellingShingle McGrath, Triona
Kivimäe, Caroline
Tanhua, Toste
Cave, Rachel R.
McGovern, Evin
Inorganic carbon and pH levels in the Rockall Trough 1991–2010
author_facet McGrath, Triona
Kivimäe, Caroline
Tanhua, Toste
Cave, Rachel R.
McGovern, Evin
author_sort McGrath, Triona
title Inorganic carbon and pH levels in the Rockall Trough 1991–2010
title_short Inorganic carbon and pH levels in the Rockall Trough 1991–2010
title_full Inorganic carbon and pH levels in the Rockall Trough 1991–2010
title_fullStr Inorganic carbon and pH levels in the Rockall Trough 1991–2010
title_full_unstemmed Inorganic carbon and pH levels in the Rockall Trough 1991–2010
title_sort inorganic carbon and ph levels in the rockall trough 1991–2010
publisher Elsevier
publishDate 2012
url https://oceanrep.geomar.de/id/eprint/19323/
https://oceanrep.geomar.de/id/eprint/19323/1/1-s2.0-S0967063712001185-main.pdf
https://doi.org/10.1016/j.dsr.2012.05.011
long_lat ENVELOPE(-15.036,-15.036,53.825,53.825)
geographic Rockall Trough
geographic_facet Rockall Trough
genre Labrador Sea
genre_facet Labrador Sea
op_relation https://oceanrep.geomar.de/id/eprint/19323/1/1-s2.0-S0967063712001185-main.pdf
McGrath, T., Kivimäe, C., Tanhua, T. , Cave, R. R. and McGovern, E. (2012) Inorganic carbon and pH levels in the Rockall Trough 1991–2010. Deep Sea Research Part I: Oceanographic Research Papers, 68 . pp. 79-91. DOI 10.1016/j.dsr.2012.05.011 <https://doi.org/10.1016/j.dsr.2012.05.011>.
doi:10.1016/j.dsr.2012.05.011
op_rights info:eu-repo/semantics/restrictedAccess
op_doi https://doi.org/10.1016/j.dsr.2012.05.011
container_title Deep Sea Research Part I: Oceanographic Research Papers
container_volume 68
container_start_page 79
op_container_end_page 91
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