Poster (Scientific congresses and symposiums)
Sensitivity of the CaCO3 content of marine sediments to the kinetic expression of CaCO3 dissolution
Schneider, Birgit; Munhoven, Guy; Regenberg, Anke
201311th International Conference on Paleoceanography (ICP 11)
 

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Keywords :
Carbonate; Dissolution reaction; Kinetics; Ocean Carbon Cycle
Abstract :
[en] The preservation of calcite in marine sediments depends on the CaCO3 saturation state of the ambient pore waters and - to a lesser degree - of overlying seawater. A simple sensitivity analysis shows that the two common expressions to quantify the saturation of seawater with respect to CaCO3 (ΔCO3 =[CO3 ]-[CO3 ]sat , Ω = [CO3 ]/[CO3 ]sat ), when used for the calculation of the time dependent rate of CaCO3 dissolution either in the water column or in the sediments, yield very different rates of CaCO3 dissolution. With the help of an ocean biogeochemical model it was found that different kinetic expressions for pelagic CaCO3 dissolution in an ocean acidification scenario result in a wide range of surface to mid-depth calcite fluxes in the open ocean, which has strong implications for particle ballasting, the flux of calcite to the sediments and finally the global carbon cycle. In the present study we employ a marine sediment model that is fed by calcite and other biogeochemical fluxes from the ocean biogeochemical model using different realizations of calcite dissolution kinetics under (1) preindustrial and (2) last glacial maximum background climate conditions to assess the model-data agreement of the calcite content of deep sea sediments. A better understanding of the mechanisms driving calcite dissolution in the ocean is important to assess the time scale of calcite compensation, for example during glacial-interglacial cycles, but also in future greenhouse scenarios.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Schneider, Birgit;  Christian-Albrechts-Universität zu Kiel - CAU Kiel
Munhoven, Guy ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Regenberg, Anke;  Christian-Albrechts-Universität zu Kiel - CAU Kiel
Language :
English
Title :
Sensitivity of the CaCO3 content of marine sediments to the kinetic expression of CaCO3 dissolution
Publication date :
05 September 2013
Number of pages :
A0
Event name :
11th International Conference on Paleoceanography (ICP 11)
Event place :
Sitges, Barcelona, Spain
Event date :
from 01-09-1013 to 06-09-2013
Audience :
International
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 11 September 2013

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