Documentation for Low-res δ15N and δ18O of O2 in the WAIS Divide 06A Deep Core, Version 1

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Detailed Data Description

This data set is a low-resolution set of measurements of δ15N of N2 and δ18O of O2, along with δO2/N and δAr/N2 supporting data, in the WAIS Divide 3405 m long ice core recovered in 2011.

This data set was used to build the chronology of the ice core (see Buizert et al., Clim. Past, 11, 153-173, 2015). The δ15N provides an estimate of firn thickness, and is used in conjunction with borehole temperature and water isotopes to produce a temperature history and a chronology in a grand inversion with an ice flow model. The δ18O of O2 can be used in the future to match other ice cores and glacial outcrops to the WAIS Divide gas chronology.

Format

Data are provided in tab-limited ASCII format.

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File and Directory Structure

Data are available on the FTP site in the ftp://sidads.colorado.edu/pub/DATASETS/AGDC/nsidc0638_severinghaus/ directory. Within this directory, there is one file: WAIS_TempReconstruction_300mBorehole.txt.

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File Size

159 KB

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Spatial Coverage

WAIS Divide Ice Core:

Southernmost Latitude: -79.47°
Northernmost Latitude: -79.47°
Westernmost Longitude: -112.08°
Easternmost Longitude: -112.08°

Spatial Resolution

Approximately 100 year resolution

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Temporal Coverage

Data were collected from 01 January 1999 to 31 December 2007.

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Parameter or Variable

Oxygen Isotopic Ratio (δ18O)

Nitrogen Isotopic Ratio (δ15N)

Delta Oxygen and Nitrogen (δO2/N)

Delta Argon and Nitrogen (δAr/N2)

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Software and Tools

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Data Acquisition and Processing

Dual-inlet dynamic mass spectrometry combined with melt-refreeze gas extraction from 15 gram ice samples. Samples were cut on a band saw following standard procedures outlined in Petrenko et al., 2006 Quaternary Science Reviews 25, 865-875.

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References and Related Publications

Contacts and Acknowledgments

Jeffrey Severinghaus
UC San Diego 
Scripps Institution of Oceanography
9500 Gilman Drive
La Jolla, CA 92093-0244

Acknowledgments: 

This research was supported by NSF Division of Polar Programs (PLR) Grant Number 05-38657.

Document Information

DOCUMENT CREATION DATE

October 2015