The effect of pressure on aragonite dissolution rates in seawater

James G. Acker; Robert H. Byrne; Samuel Ben-Yaakov; Richard A. Feely; Peter R. Betzer

doi:10.1016/0016-7037(87)90266-3

The effect of pressure on aragonite dissolution rates in seawater

James G. Acker, Robert H. Byrne, Samuel Ben-Yaakov, Richard A. Feely, Peter R. Betzer

Department of Electrical & Computer Engineering

Research output: Contribution to journal › Article › peer-review

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Abstract

Aragonite dissolution in seawater at variable pressure is well described by the equation Rate = k′([CO^2-₃]_s - [CO^2-₃])ⁿ where [CO^2-₃]_s, is the carbonate ion concentration at saturation, [CO^2-₃] is the observed carbonate ion concentration and k′ and n are empirical constants. Application of the equation Rate = k(1 - Ω)ⁿ to descriptions of aragonite dissolution rates (where Ω = [CO^2-₃] [CO^2-₃]_s) is appropriate at constant pressure, temperature and salinity. Our measurements in seawater at 5°C are consistent with the estimate -ΔV = 36.5 cm³/mole for the volume change accompanying aragonite dissolution. This result is somewhat higher than laboratory estimates, but lower than estimates based on calcite and the difference between calcite and aragonite molar volumes.

Original language	English
Pages (from-to)	2171-2175
Number of pages	5
Journal	Geochimica et Cosmochimica Acta
Volume	51
Issue number	8
DOIs	https://doi.org/10.1016/0016-7037(87)90266-3
State	Published - 1 Jan 1987

ASJC Scopus subject areas

Geochemistry and Petrology

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10.1016/0016-7037(87)90266-3

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title = "The effect of pressure on aragonite dissolution rates in seawater",

abstract = "Aragonite dissolution in seawater at variable pressure is well described by the equation Rate = k′([CO2-3]s - [CO2-3])n where [CO2-3]s, is the carbonate ion concentration at saturation, [CO2-3] is the observed carbonate ion concentration and k′ and n are empirical constants. Application of the equation Rate = k(1 - Ω)n to descriptions of aragonite dissolution rates (where Ω = [CO2-3] [CO2-3]s) is appropriate at constant pressure, temperature and salinity. Our measurements in seawater at 5°C are consistent with the estimate -ΔV = 36.5 cm3/mole for the volume change accompanying aragonite dissolution. This result is somewhat higher than laboratory estimates, but lower than estimates based on calcite and the difference between calcite and aragonite molar volumes.",

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AU - H. Byrne, Robert

AU - Ben-Yaakov, Samuel

AU - A. Feely, Richard

AU - R. Betzer, Peter

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N2 - Aragonite dissolution in seawater at variable pressure is well described by the equation Rate = k′([CO2-3]s - [CO2-3])n where [CO2-3]s, is the carbonate ion concentration at saturation, [CO2-3] is the observed carbonate ion concentration and k′ and n are empirical constants. Application of the equation Rate = k(1 - Ω)n to descriptions of aragonite dissolution rates (where Ω = [CO2-3] [CO2-3]s) is appropriate at constant pressure, temperature and salinity. Our measurements in seawater at 5°C are consistent with the estimate -ΔV = 36.5 cm3/mole for the volume change accompanying aragonite dissolution. This result is somewhat higher than laboratory estimates, but lower than estimates based on calcite and the difference between calcite and aragonite molar volumes.

AB - Aragonite dissolution in seawater at variable pressure is well described by the equation Rate = k′([CO2-3]s - [CO2-3])n where [CO2-3]s, is the carbonate ion concentration at saturation, [CO2-3] is the observed carbonate ion concentration and k′ and n are empirical constants. Application of the equation Rate = k(1 - Ω)n to descriptions of aragonite dissolution rates (where Ω = [CO2-3] [CO2-3]s) is appropriate at constant pressure, temperature and salinity. Our measurements in seawater at 5°C are consistent with the estimate -ΔV = 36.5 cm3/mole for the volume change accompanying aragonite dissolution. This result is somewhat higher than laboratory estimates, but lower than estimates based on calcite and the difference between calcite and aragonite molar volumes.

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The effect of pressure on aragonite dissolution rates in seawater

Abstract

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