Journal ArticleDOI
Production and accumulation of calcium carbonate in the ocean: Budget of a nonsteady state
TLDR
In this article, it was shown that the oceans are not presently in a steady state, suggesting that outputs have been overestimated or inputs underestimated, that one or more other inputs have not been identified, and/or that one of the missing calcium sources might be groundwater, although its presentday input is probably much smaller than that of rivers.Abstract:
Present-day production of CaCO3 in tne world ocean is calculated to be about 5 billion tons (bt) per year, of which about 3 bt accumulate in sediments; the other 40% is dissolved. Nearly half of the carbonate sediment accumulates on reefs, banks, and tropical shelves, and consists largely of metastable aragonite and magnesian calcite. Deep-sea carbonates, predominantly calcitic coccoliths and planktonic foraminifera, have orders of magnitude lower productivity and accumulation rates than shallow-water carbonates, but they cover orders of magnitude larger basin area. Twice as much calcium is removed from the oceans by present-day carbonate accumulation as is estimated to be brought in by rivers and hydrothermal activity (1.6 bt), suggesting that outputs have been overestimated or inputs underestimated, that one or more other inputs have not been identified, and/or that the oceans are not presently in steady state. One “missing” calcium source might be groundwater, although its present-day input is probably much smaller than that of rivers. If, as seems likely, CaCO3 accumulation presently exceeds terrestial and hydrothermal input, this imbalance presumably is offset by decreased accumulation and increased input during lowered sea level: shallow-water accumulation decreases by an order of magnitude with a 100 m drop in sea level, while groundwater influx increases because of heightened piezometric head and the diagenesis of metastable aragonite and magnesian calcite from subaerially exposed shallow-water carbonates.read more
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Book ChapterDOI
8.10 – Biological Fluxes in the Ocean and Atmospheric pCO2
D. Archer,T. Jokulsdottir +1 more
TL;DR: In this article, the authors synthesize the impacts of biological fluxes in the ocean on the CO2 concentration of the atmosphere, and discuss ways in which biological fluxe might respond to past and future changes in climate and the chemistry of the oceans, such as ocean acidification.
Seagrass-Mediated Carbonate Dissolution and Early Diagenesis in Bahamas Bank Sediments
TL;DR: Hu et al. as discussed by the authors examined the role of seagrass in carbonate dissolution and early diagenesis of Bahamas Bank sediments and found that carbon dissolution was the likely dominant carbonate removal mechanism that accounts for -50% of gross carbonate production.
Journal Article
Calcite production by Coccolithophores in the South East Pacific Ocean: from desert to jungle
TL;DR: The BOSOPE cruise achieved an oceanographic transect from the Marquise Islands to the Peru-Chili upwelling (PCU) via the centre of the South Pacific Gyre (SPG).
Journal ArticleDOI
Biochemical characterization of the skeletal matrix of the massive coral, Porites australiensis - The saccharide moieties and their localization.
Takeshi Takeuchi,Laurent Plasseraud,Isabelle Ziegler-Devin,Nicolas Brosse,Chuya Shinzato,Noriyuki Satoh,Frédéric Marin +6 more
TL;DR: This study analyzed the SOM of the massive colonial coral, Porites australiensis, and found that it exhibits strong specificity to Datura stramonium lectin (DSL), emphasizing the importance of sugar moieties in biomineralization of scleractinian corals.
Journal ArticleDOI
Assessing legacy contaminants in sediments from marine protected areas of the central coast of São Paulo (Brazil)
Lucas Buruaem Moreira,Thaisa Marques Vicente,Satie Taniguchi,Marcos Antonio Hortellani,Jorge E. S. Sarkis,Márcia Caruso Bícego,Denis Moledo de Souza Abessa +6 more
TL;DR: The presence of legacy contaminants in sediments from three Marine Protected Areas (MPAs) of the coast of Sao Paulo State was evaluated in this article, where four sampling surveys were conducted between 2013 and 2015 in 10 sites, distributed along the Laje de Santos Marine and Xixova-Japui State Parks (PEMLS and XJSP, respectively) and Central Coast Marine Protection Area (APAMLC).
References
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Journal ArticleDOI
Vostok ice core provides 160,000-year record of atmospheric CO2
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Journal ArticleDOI
Biological communities at the Florida escarpment resemble hydrothermal vent taxa.
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Journal ArticleDOI
A biogeochemical study of the coccolithophore, Emiliania huxleyi, in the North Atlantic
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