Conservative and non-conservative variations of total alkalinity on the southeastern Bering Sea shelf.
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| Title: | Conservative and non-conservative variations of total alkalinity on the southeastern Bering Sea shelf. |
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| Authors: | Cross, Jessica N.1 jncross@alaska.edu, Mathis, Jeremy T.2 jeremy.mathis@noaa.gov, Bates, Nicholas R.3 nick.bates@bios.edu, Byrne, Robert H.4 rhbyrne@usf.edu |
| Source: | Marine Chemistry. Aug2013, Vol. 154, p100-112. 13p. |
| Subjects: | Water alkalinity, Calcium carbonate, Spatio-temporal variation, Carbonate minerals, Dissolution (Chemistry), Denitrification, Seawater |
| Abstract: | Abstract: Recent observations of calcium carbonate (CaCO3) mineral undersaturations on the Bering Sea shelf have prompted new interest in the physical and biological factors that control the inorganic carbon system in the region. Understanding of the dynamics that influence the spatio-temporal variability of total alkalinity (TA) – one major component of the seawater carbonate system – has been constrained by limited historical data collected across the shelf, and the consensus has been that TA is largely conservative. However, the recently documented undersaturated conditions have the potential to cause substantial non-conservative variability in TA in this region through the dissolution of carbonate minerals. In order to quantify the contribution of carbonate mineral precipitation and dissolution to variability in TA on the southeastern Bering Sea shelf, we examined seasonal observations of TA that were made between 2008 and 2010 as part of the BEST-BSIERP Bering Sea Project. Conservative influences accounted for most of the variability in TA concentrations, with well-constrained mixing dominating in spring and summer of 2008. Bering Shelf Water (BSW) contained a constant ratio of TA to salinity, while river discharge (RW) added TA relative to salinity at a predictable rate. Although substantial organic carbon production and denitrification can cause some non-conservative variation in TA concentrations (a maximum of ~15μmolkgSW−1 combined), carbonate mineral dissolution and precipitation were shown to be the most important processes responsible for non-conservative TA–salinity relationships. CaCO3 uptake by the dominant pelagic phytoplankton calcifier (i.e., coccolithophores) was shown to alter TA concentrations by as much as 59μmolkgSW−1. Evidence for shallow-water CaCO3 mineral dissolution was also observed, which caused TA concentrations to increase by as much as 36μmolkgSW−1. Therefore, contrary to our previous understanding, the non-conservative physico-biogeochemical factors observed in this study play an important role in controlling the ocean carbon cycle of the Bering Sea shelf. [Copyright &y& Elsevier] |
| Copyright of Marine Chemistry is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 89303175 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Conservative and non-conservative variations of total alkalinity on the southeastern Bering Sea shelf. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Cross%2C+Jessica+N%2E%22">Cross, Jessica N.</searchLink><relatesTo>1</relatesTo><i> jncross@alaska.edu</i><br /><searchLink fieldCode="AR" term="%22Mathis%2C+Jeremy+T%2E%22">Mathis, Jeremy T.</searchLink><relatesTo>2</relatesTo><i> jeremy.mathis@noaa.gov</i><br /><searchLink fieldCode="AR" term="%22Bates%2C+Nicholas+R%2E%22">Bates, Nicholas R.</searchLink><relatesTo>3</relatesTo><i> nick.bates@bios.edu</i><br /><searchLink fieldCode="AR" term="%22Byrne%2C+Robert+H%2E%22">Byrne, Robert H.</searchLink><relatesTo>4</relatesTo><i> rhbyrne@usf.edu</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Marine+Chemistry%22">Marine Chemistry</searchLink>. Aug2013, Vol. 154, p100-112. 13p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Water+alkalinity%22">Water alkalinity</searchLink><br /><searchLink fieldCode="DE" term="%22Calcium+carbonate%22">Calcium carbonate</searchLink><br /><searchLink fieldCode="DE" term="%22Spatio-temporal+variation%22">Spatio-temporal variation</searchLink><br /><searchLink fieldCode="DE" term="%22Carbonate+minerals%22">Carbonate minerals</searchLink><br /><searchLink fieldCode="DE" term="%22Dissolution+%28Chemistry%29%22">Dissolution (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Denitrification%22">Denitrification</searchLink><br /><searchLink fieldCode="DE" term="%22Seawater%22">Seawater</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Abstract: Recent observations of calcium carbonate (CaCO3) mineral undersaturations on the Bering Sea shelf have prompted new interest in the physical and biological factors that control the inorganic carbon system in the region. Understanding of the dynamics that influence the spatio-temporal variability of total alkalinity (TA) – one major component of the seawater carbonate system – has been constrained by limited historical data collected across the shelf, and the consensus has been that TA is largely conservative. However, the recently documented undersaturated conditions have the potential to cause substantial non-conservative variability in TA in this region through the dissolution of carbonate minerals. In order to quantify the contribution of carbonate mineral precipitation and dissolution to variability in TA on the southeastern Bering Sea shelf, we examined seasonal observations of TA that were made between 2008 and 2010 as part of the BEST-BSIERP Bering Sea Project. Conservative influences accounted for most of the variability in TA concentrations, with well-constrained mixing dominating in spring and summer of 2008. Bering Shelf Water (BSW) contained a constant ratio of TA to salinity, while river discharge (RW) added TA relative to salinity at a predictable rate. Although substantial organic carbon production and denitrification can cause some non-conservative variation in TA concentrations (a maximum of ~15μmolkgSW−1 combined), carbonate mineral dissolution and precipitation were shown to be the most important processes responsible for non-conservative TA–salinity relationships. CaCO3 uptake by the dominant pelagic phytoplankton calcifier (i.e., coccolithophores) was shown to alter TA concentrations by as much as 59μmolkgSW−1. Evidence for shallow-water CaCO3 mineral dissolution was also observed, which caused TA concentrations to increase by as much as 36μmolkgSW−1. Therefore, contrary to our previous understanding, the non-conservative physico-biogeochemical factors observed in this study play an important role in controlling the ocean carbon cycle of the Bering Sea shelf. [Copyright &y& Elsevier] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Marine Chemistry is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.marchem.2013.05.012 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 13 StartPage: 100 Subjects: – SubjectFull: Water alkalinity Type: general – SubjectFull: Calcium carbonate Type: general – SubjectFull: Spatio-temporal variation Type: general – SubjectFull: Carbonate minerals Type: general – SubjectFull: Dissolution (Chemistry) Type: general – SubjectFull: Denitrification Type: general – SubjectFull: Seawater Type: general Titles: – TitleFull: Conservative and non-conservative variations of total alkalinity on the southeastern Bering Sea shelf. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Cross, Jessica N. – PersonEntity: Name: NameFull: Mathis, Jeremy T. – PersonEntity: Name: NameFull: Bates, Nicholas R. – PersonEntity: Name: NameFull: Byrne, Robert H. IsPartOfRelationships: – BibEntity: Dates: – D: 20 M: 08 Text: Aug2013 Type: published Y: 2013 Identifiers: – Type: issn-print Value: 03044203 Numbering: – Type: volume Value: 154 Titles: – TitleFull: Marine Chemistry Type: main |
| ResultId | 1 |
