The Effect of Pressure on Aragonite Dissolution Rates in Seawater

Authors

James G. Acker, University of South Florida
Robert H. Byrne, University of South FloridaFollow
Samuel Ben-Yaakov, Ben Gurion University
Richard A. Feely, Pacific Marine Environmental Laboratory
Peter R. Betzer, University of South Florida

Document Type

Article

Publication Date

1987

Digital Object Identifier (DOI)

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

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">Rate= k(1 − Ω)n to descriptions of aragonite dissolution rates (where Ω =[CO2−3][CO2−3]s">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.

Was this content written or created while at USF?

Yes

Citation / Publisher Attribution

Geochimica et Cosmochimica Acta, v. 51, issue 8, p. 2171-2175

Scholar Commons Citation

Acker, James G.; Byrne, Robert H.; Ben-Yaakov, Samuel; Feely, Richard A.; and Betzer, Peter R., "The Effect of Pressure on Aragonite Dissolution Rates in Seawater" (1987). Marine Science Faculty Publications. 1676.
https://digitalcommons.usf.edu/msc_facpub/1676