English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/129516
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:
Title

Calcium distribution in the subtropical Atlantic Ocean: Implications for calcium excess and saturation horizons

AuthorsRosón, Gabriel; Fernández-Guallart, E. ; Pérez, Fiz F. ; Ríos, Aida F.
KeywordsCalcium
Alkalinity
Aragonite
Calcite
Seawater
North Atlantic
Issue DateJun-2016
PublisherElsevier
CitationJournal of Marine Systems 158: 45-51 (2016)
AbstractThis study constituted the first attempt to measure dissolved calcium ([Ca2 +]meas) in the subtropical North Atlantic, during a zonal transoceanic cruise along 24.5°N (WOCE A05 section), in summer 1992. [Ca2 +]meas was obtained in 20 full-depth equidistant stations along the section, showing that their gradients are rather sensitive to horizontal and vertical water mass distribution. Deep waters along 24.5°N systematically show a positive calcium excess of 20 ± 14 μmol·kg− 1, i.e., more [Ca2 +] than expected by CaCO3 dissolution and organic matter oxidation (estimated by total alkalinity and nitrate). CaCO3 settling and benthic dissolution accounts for 70% and the North Atlantic plus Arctic riverine inputs of HCO3− for the remaining 30%. Combining [Ca2 +]meas and CO2 data sets, carbonate mineral saturation states distributions for aragonite and calcite can be obtained. The two solubility ratios resulted, on average, 0.5% smaller than if conservative behavior for Ca2 + was assumed (an approach widely followed when [Ca2 +]meas is unknown). As a result, shallower saturation horizon depths for both carbonate states (19 dbar for aragonite and 10 dbar for calcite) are yielded if [Ca2 +]meas is taken into account instead than estimated from salinity
Description7 páginas, 1 tabla, 4 figuras
Publisher version (URL)http://dx.doi.org/10.1016/j.jmarsys.2016.01.011
URIhttp://hdl.handle.net/10261/129516
DOI10.1016/j.jmarsys.2016.01.011
ISSN0924-7963
E-ISSN1879-1573
Appears in Collections:(IIM) Artículos
(ICM) Artículos
Files in This Item:
File Description SizeFormat 
Calcium_distribution_subtropical.pdf1,68 MBAdobe PDFThumbnail
View/Open
Show full item record
 


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.