Dissolution Rates of Biogenic Carbonates in Natural Seawater at Different pCO2 Conditions: A Laboratory Study

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• 作者：Mallory Pickett ; Andreas J. Andersson
• 关键词：CaCO3 dissolution ; Mg ; calcite ; Biogenic ; Carbonate ; Ocean acidification ; CO2
• 刊名：Aquatic Geochemistry
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：21
• 期：6
• 页码：459-485
• 全文大小：1,667 KB
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• 作者单位：Mallory Pickett (1)
  Andreas J. Andersson (1)
  
  1. Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, 92093-0244, USA
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geochemistry
  Hydrogeology
  
• 出版者：Springer Netherlands
• ISSN：1573-1421

文摘

The bulk dissolution rates of six biogenic carbonates (goose barnacle, benthic foraminifera, bryozoan, sea urchin, and two types of coralline algae) and a sample of mixed sediment from the Bermuda carbonate platform were measured in natural seawater at pCO₂ values ranging from approximately 3000 to 5500 μatm. This range of pCO₂ values encompassed values regularly observed in porewaters at a depth of a few cm in carbonate sediments at shallow water depths (<15 m) on the Bermuda carbonate platform. The biogenic carbonates included calcites of varying Mg content (2-7 mol%) and a range of specific surface areas (0.01-.7 m2 g?) as determined by BET gas adsorption. Measured rates of dissolution increased with increasing pCO₂ treatment for all substrates and ranged from 2.5 to 18 μmol g? h?. The highest rates of dissolution were observed for the bryozoans and the lowest rates for the goose barnacles. The relative ranking in dissolution rates between different substrates was consistent at all pCO₂ levels, indicating that substrates dissolve sequentially and that some substrates will be more vulnerable than others to rising CO₂ and ocean acidification. Furthermore, dissolution rates were found to increase with increasing Mg content, though the relative dissolution rates were observed to be a function of both Mg content and microstructure (surface area). Keywords CaCO₃ dissolution Mg-calcite Biogenic Carbonate Ocean acidification CO₂