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Seawater carbonate chemistry and net dissolution rate for experiment of Shiraho reef

Acidification of the oceans by increasing anthropogenic CO2 emissions will cause a decrease in biogenic calcification and an increase in carbonate dissolution. Previous studies have suggested that carbonate dissolution will occur in polar regions and in the deep sea where saturation state with respect to carbonate minerals (Omega) will be 1. This is probably related to the dissolution of reef carbonate (Mg-calcite), which is more soluble than aragonite. However, the threshold of Omega for the dissolution of natural sediments has not been clearly determined. We designed an experimental dissolution system with conditions mimicking those of a natural coral reef, and measured the dissolution rates of aragonite in corals, and of Mg-calcite excreted by other marine organisms, under conditions of Omega a > 1, with controlled seawater pCO2. The experimental data show that dissolution of bulk carbonate sediments sampled from a coral reef occurs at Omega a values of 3.7 to 3.8. Mg-calcite derived from foraminifera and coralline algae dissolves at Omega a values between 3.0 and 3.2, and coralline aragonite starts to dissolve when Omega a = 1.0. We show that nocturnal carbonate dissolution of coral reefs occurs mainly by the dissolution of foraminiferans and coralline algae in reef sediments.

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Yamamoto, Shoji, Kayanne, Hajime, Terai, Makoto, Watanabe, Atsushi, Kato, Ken, Negishi, Akira, Nozaki, Ken (2012). Dataset: Seawater carbonate chemistry and net dissolution rate for experiment of Shiraho reef. https://doi.org/10.1594/PANGAEA.820200

DOI retrieved: 2012

Additional Info

Field Value
Imported on November 30, 2024
Last update November 30, 2024
License CC-BY-3.0
Source https://doi.org/10.1594/PANGAEA.820200
Author Yamamoto, Shoji
Given Name Shoji
Family Name Yamamoto
More Authors
Kayanne, Hajime
Terai, Makoto
Watanabe, Atsushi
Kato, Ken
Negishi, Akira
Nozaki, Ken
Source Creation 2012
Publication Year 2012
Resource Type text/tab-separated-values - filename: Yamamoto_2012
Subject Areas
Name: Chemistry

Name: Ecology

Name: Lithosphere

Related Identifiers
Title: Threshold of carbonate saturation state determined by CO2 control experiment
Identifier: https://doi.org/10.5194/bg-9-1441-2012
Type: DOI
Relation: IsSupplementTo
Year: 2012
Source: Biogeosciences
Authors: Yamamoto Shoji , Kayanne Hajime , Terai Makoto , Watanabe Atsushi , Kato Ken , Negishi Akira , Nozaki Ken .

Title: seacarb: seawater carbonate chemistry with R. R package version 2.4
Identifier: https://cran.r-project.org/package=seacarb
Type: DOI
Relation: References
Year: 2011
Authors: Lavigne Héloïse , Gattuso Jean-Pierre .