A kinetic pressure effect on calcite dissolution in seawater
نویسندگان
چکیده
منابع مشابه
Catalysis and chemical mechanisms of calcite dissolution in seawater.
Near-equilibrium calcite dissolution in seawater contributes significantly to the regulation of atmospheric [Formula: see text] on 1,000-y timescales. Despite many studies on far-from-equilibrium dissolution, little is known about the detailed mechanisms responsible for calcite dissolution in seawater. In this paper, we dissolve 13C-labeled calcites in natural seawater. We show that the time-ev...
متن کاملSupporting Information for “Catalysis and Chemical Mechanisms of Calcite Dissolution in Seawater”
6-8 large (300x300 μm) 13C-labeled calcite grains were embedded in 1-inch epoxy discs. Discs were then polished to 0.25 μm and reacted for 48 hours in an experimental setup similar to the dissolution experiments described in the Methods section and in Subhas et al. (2015). The alkalinity contribution of the epoxy resin to alkalinity over the course of the 48-hour experiment was minimal (at most...
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[1] Fish have been shown to produce high (10 to 48 mol %) magnesium calcite as part of the physiological mechanisms responsible for maintaining salt and water balance. The importance of this source to the marine carbon cycle is only now being considered. In this paper, we report the first measurements of the solubility of this CaCO3 in seawater. The resulting solubility (pK*sp = 5.89 0.09) is a...
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The results of an in situ study of calcite dissolution in the Panama Basin indicate that the rate of dissolution in the water column increases suddenly below a water depth of about 2800 meters. This coincides with the depth at which the calcium carbonate content of surface sediments begins to decrease rapidly or the sedimentary lysocline. Since this level of increased dissolution both in the wa...
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Human otoconia provide mechanical stimuli to deflect hair cells of the vestibular sensory epithelium for purposes of detecting linear acceleration and head tilts. During lifetime, the volume and number of otoconia are gradually reduced. In a process of degeneration morphological changes occur. Structural changes in human otoconia are assumed to cause vertigo and balance disorders such as benign...
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ژورنال
عنوان ژورنال: Geochimica et Cosmochimica Acta
سال: 2018
ISSN: 0016-7037
DOI: 10.1016/j.gca.2018.07.015