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d18o-ivc-sw

Compute oxygen-isotope chronologies for seawater from forams in sediment cores: ice-volume and temperature corrected

https://github.com/awickert/d18o-ivc-sw

Science Score: 67.0%

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Repository

Compute oxygen-isotope chronologies for seawater from forams in sediment cores: ice-volume and temperature corrected

Basic Info
  • Host: GitHub
  • Owner: awickert
  • License: gpl-3.0
  • Language: Python
  • Default Branch: master
  • Size: 37.1 KB
Statistics
  • Stars: 0
  • Watchers: 2
  • Forks: 0
  • Open Issues: 0
  • Releases: 1
Created over 6 years ago · Last pushed over 3 years ago
Metadata Files
Readme License Citation

README.md

DOI

d18O-ivc-sw

Compute oxygen-isotope chronologies for seawater from foraminifera in sediment cores: ice-volume and temperature corrected

This library will help you go through the following steps: * Start with raw δ18O (VPDB) values * Convert them to VSMOW * Using Mg/Ca ratios, compute paleotemperatures * Interpolate missing paleotemperatures * Using these paleotemperatures, convert the δ18O (VSMOW) values into δ18Osw. This subscript ("sw") stands for "seawater", as this step corrects for temperature effects on the isotope ratio within the formainiferal shells and returns the expected seawater δ18O value. * Using a sea-level curve, this corrects for ice-volume effects on the bulk ocean δ18O, thus providing an ice-volume-corrected δ18Oivc-sw

Error is propagated through each of these steps.

The resultant δ18O_ivc-sw can be used in isotope-mixing studies for paleohydrology.

Note to users: there is still a bit hard-coded in here; I will fix that eventually but let me know if you need it sooner.

This process is based on the steps taken by:

Wickert, A. D., J. X. Mitrovica, C. Williams, and R. S. Anderson (2013), Gradual demise of a thin southern Laurentide ice sheet recorded by Mississippi drainage, Nature, 502(7473), 668–671, doi:10.1038/nature12609.

The sea-level curve included in this repository is from:

Spratt, R. M. and Lisiecki, L. E.: A Late Pleistocene sea level stack, Clim. Past, 12(4), 1079–1092, doi:10.5194/cp-12-1079-2016, 2016.

Additional references are noted in the Python file.

Owner

  • Name: Andy Wickert
  • Login: awickert
  • Kind: user
  • Location: Potsdam, Germany
  • Company: University of Minnesota / GFZ Potsdam

Rivers, glaciers, landscapes, and sea level, in the past and present

Citation (CITATION.cff) 

cff-version: 1.1.0
message: "If you use this software, please cite it as below."
authors:
  - family-names: Wickert
    given-names: "Andrew D."
    orcid: https://orcid.org/0000-0002-9545-3365
title: "d18O-ivc-sw: Computing ice-volume-corrected seawater d18O values from sediment-core data"
version: v1.0.0
doi: 10.5281/zenodo.5704598
date-released: 2019-11-04
url: "https://github.com/awickert/d18O-ivc-sw/"

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