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Reconstructing Last Glacial Maximum bottom water salinities from deep-sea sediment pore fluid profiles

Adkins, Jess F. and Schrag, Daniel P. (2003) Reconstructing Last Glacial Maximum bottom water salinities from deep-sea sediment pore fluid profiles. Earth and Planetary Science Letters, 216 (1-2). pp. 109-123. ISSN 0012-821X. doi:10.1016/S0012-821X(03)00502-8.

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Deep-sea sediment pore fluids contain a record of past glaciations in their [Cl] and δ^(18)O. The signal of the Last Glacial Maximum (LGM) ice volume increase remains in the pore fluids as a local peak in each of these species. Using a one-dimensional model to account for the diffusive and advective transport within the sediment column since the LGM, the past bottom water salinity and δ^(18)O_(seawater) values can be estimated. The model is most sensitive to the shape of the forcing function used to represent bottom water variations through time, the effective diffusion coefficient, and the scatter in the data. Assuming steady-state compaction, the model is relatively insensitive to the initial condition, the bulk sedimentation rate and the assumed porosity profile, though these last two are measured independently. Overall uncertainties in the relative [Cl] increase at the LGM are between 0.1 and 0.5%, where the mean ocean change is about 3.5%.

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Adkins, Jess F.0000-0002-3174-5190
Additional Information:© 2003 Elsevier B.V. Received 31 March 2003; received in revised form 28 August 2003; accepted 5 September 2003. During her stay at Caltech, Kate McIntyre collected many of the [Cl] profiles and provided many helpful comments on the modeling sensitivities. David Hodel, Chris Charles, Peggy Delaney, Alan Mix and all the inorganic chemists worked extremely hard to collect the pore fluid samples during ODP Legs 177 and 202. Reviews from L. Labeyrie, J. Lynch-Stieglitz and B. Boudreau greatly improved the manuscript. This work was supported by NSF Grant numbers OCE-0096814 to J.F.A. and OCE-0096909 to D.P.S.[BARD]
Group:UNSPECIFIED, Division of Geological and Planetary Sciences
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Subject Keywords: paleo-salinity; diffusion; Last Glacial Maximum
Issue or Number:1-2
Record Number:CaltechAUTHORS:20120828-082914777
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Official Citation:Jess F Adkins, Daniel P Schrag, Reconstructing Last Glacial Maximum bottom water salinities from deep-sea sediment pore fluid profiles, Earth and Planetary Science Letters, Volume 216, Issues 1–2, 15 November 2003, Pages 109-123, ISSN 0012-821X, 10.1016/S0012-821X(03)00502-8. (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33592
Deposited By: Ruth Sustaita
Deposited On:28 Aug 2012 16:27
Last Modified:09 Nov 2021 21:35

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