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Data Set ID:
NSIDC-0640

Mount Moulton Isotopes and Other Ice Core Data, Version 1

This data set consists of water isotope ratios from the Mt. Moulton ice-trench record, as well as data from the Taylor Dome, EPICA Dome C, Talos Dome, Vostok, and EPICA Dronning Maud Land ice cores.

Geographic Coverage

Parameter(s):
  • Paleoclimate Indicators > Ice Core Records > Oxygen Isotopes
Spatial Coverage:
  • N: -74.04, S: -74.04, E: -134.43, W: -134.43

Spatial Resolution: Not Specified
Temporal Coverage:
  • 7 January 2007 to 31 December 2008
Temporal Resolution: 500 year
Data Format(s):
  • ASCII Text
Platform(s) LABORATORY
Sensor(s): MASS SPECTROMETERS
Version: V1
Data Contributor(s): Eric Steig, James White, Trevor Popp
Please contact the data provider for the correct Data Citation for this data set.

Literature Citation

As a condition of using these data, we request that you acknowledge the author(s) of this data set by referencing the following peer-reviewed publication.

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Detailed Data Description

This data set includes isotope data from Mt. Moulton, as well as 500-year averages of isotope data from the EPICA Dome C, Talos Dome, Vostok, and EPICA Dronning Maud Land ice cores placed on the AICC2012 timescale by interpolating the original depth-isotope data onto the AICC2012 depth-age relation for each core. NOTE: These should not be considered the official AICC2012 records for these cores.

See Figure 1 for the locations of the different ice core sites.

Sample Data 1
Figure 1. Ice Core Sites
Format

The data are in ASCII text (.txt) 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/nsidc0640_steig directory. Within this directory, there are two files: Moulton_500_year_avgs.txt and Moulton_Isotope_Data_Complete.txt.

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File Size

The files are 26.8 and 43.7 KB respectively.

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Volume

The volume of the data 70.5 KB.

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Spatial Coverage

The spatial coverage is 74°04' S; 134°43' W at an elevation of 2815 m.

Spatial Resolution

The spatial resolution is 25 cm.

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Temporal Coverage

The data were collected from 1 January 2007 to 31 December 2008.

Temporal Resolution

The temporal resolution is 500-year averages.

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Parameter or Variable

The parameters are oxygen isotopes (18O and 16O) (ppm).

Sample Data Record

The Moulton_500_year_avgs.txt file contains 11 columns. See Table 1 for the column headers and their definitions and Figure 2 for a sample of the data.

Table 1. Definition of Column Headers
Column Header Definition
Age (ka) nominal AICC2012 timescale
EDC Epica Dome C δD (Jouzel et al., 2007)
Talos Talos Dome δ18O (Stenni et al., 2011)
Fuji Dome Fuji δ18O (Watanabe et al., 2003)
Vostok Vostok δD (Jouzel et al., 1993)
EDML EPICA Dronning Maud Land δ18O (EPICA Community Members, 2006)
EDML_corr EPICA Dronning Maud Land corrected for ice flow E (EPICA Community Members, 2006)
(Mt. Moulton - header missing) Mount Moulton
---- column empty
Age (ka) Original timescale
Taylor Dome Taylor Dome δ18O (Steig et al., 2000)
Sample Data 1
Figure 2. Moulton_500_year_avgs Sample Data

The Moulton_Isotope_Data_Complete.txt file contains four columns. See Table 2 for the column headers and their definitions and Figure 3 for a sample of the data in the file (this image is only a partial representation of the columns in the file).

Table 2. Definition of Column Headers
Column Header Definition
top (m) Distance from top of section (top of sample, meters)
bottom (m) Distance from top of section (bottom of sample, meters)
age Original timescale (ka BP 1950) (Popp, 2008)
age (rev.) Revised age (ka BP 1950)
Sample Data 2
Figure 3. Moulton_Isotope_Data_Complete Sample
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Software and Tools

The data can be accessed using any text editor.

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Data Acquisition and Processing

Data Acquisition Methods

The Mt. Moulton isotope data were analyzed on samples from an ice trench in an exposed 600 m long section of blue ice on the southern shoulder of Mt. Moulton, in the Flood Range of coastal Marie Byrd Land.

Data Sources

The following references provide the original data found in the Moulton_500_year_avgs.txt. See Table 3 for the different ice cores and the relevant citation.

Table 3. Data Sources
Ice Core Reference
Vostok Jouzel, J., et al. 1993. Extending the Vostok ice-core record of palaeoclimate to the penultimate glacial period. Nature364(6436): 407-412. doi: 10.1038/364407a0.
Dome Fuji Watanabe, O., J. Jouzel, S. Johnsen, F. Parrenin, H. Shoji, and N. Yoshida. 2003. Homogeneous climate variability across East Antarctica over the past three glacial cycles. Nature 422(6931): 509-512. doi: 10.1038/nature01525.
EPICA Dome C Jouzel, J., et al. 2007. Orbital and millennial Antarctic climate variability over the past 800,000 years. Science 317(5839): 793-796. doi: 10.1126/science.1141038.
Talos Dome Stenni, B., et al. 2011. Expression of the bipolar see-saw in Antarctic climate records during the last deglaciation. Nature Geoscience 4(1): 46-49. doi: 10.1038/ngeo1026.
EPICA Dronning Maud Land EPICA Community Members. 2006. One-to-one coupling of glacial climate variability in Greenland and Antarctica. Nature444(7116): 195-198. doi: 10.1038/nature05301.
Taylor Dome Steig, E. J, D. Morse, E. D. Waddington, M. Stuiver, P. Grootes, P. Mayewski, S. Whitlow, and M. Twickler. 2000. Wisconsinan and Holocene climate history from an ice core at Taylor Dome, western Ross Embayment, Antarctica. Geografiska Annaler 82A: 213-235. doi: 10.1111/j.0435-3676.2000.00122.x.
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Derivation Techniques and Algorithms

Processing Steps

Isotope measurements were performed at the Institute of Arctic and Alpine Research Stable Isotope Laboratory at the University of Colorado, Boulder, using an automated CO2-H2O equilibration system coupled to a dedicated Micromass SIRA Series II dual inlet mass spectrometer. Precision for δ18O is ± 0.07 ppm or better. All values are reported relative to the Vienna Standard Mean Ocean Water (V-SMOW), normalized to the Standard Light Antarctic Precipitation (SLAP) standard (-55.5 ppm).

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References and Related Publications

Contacts and Acknowledgments

Eric J. Steig
Department of Earth and Space Sciences
University of Washington
Johnson Hall Rm-070, Box 351310
4000 15th Avenue NE
Seattle, WA 98195-1310

James W. C. White
University of Colorado Boulder
Environmental Studies
397 UCB, 4001 Discovery Dr.
Boulder, CO 80309

Trevor Popp
The Niels Bohr Institute, Ice and Climate
University of Copenhagen
Juliane Maries Vej 30
2100 København Ø

Acknowledgments: 

This research was supported by NSF Division of Polar Programs (PLR) Grant Number 0230316.

Document Information

Document Creation Date

23 November 2015

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