Data Set ID:
NSIDC-0597

Measurements of Trapped Air from Mullins Valley, Dry Valleys, Antarctica, Version 1

These data describe the analyses of the elemental and isotopic composition of O2, N2, and Ar and total air content made on the trapped air from three shallow ice cores (<34m depth) collected during the 2009 field campaign to Mullins Valley of the Dry Valleys, Antarctica.

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NSIDC does not archive these data.

Geographic Coverage

Parameter(s):
  • Paleoclimate Indicators > Ice Core Records > Isotopes > Argon Isotopes
  • Paleoclimate Indicators > Ice Core Records > Isotopes > Nitrogen Isotopes
  • Paleoclimate Indicators > Ice Core Records > Oxygen Isotopes
Spatial Coverage:
  • N: -77.87, S: -77.87, E: 160.35, W: 160.35

Spatial Resolution: Not Specified
Temporal Coverage: Not specified
Temporal Resolution: Not specified
Data Format(s):
  • Microsoft Excel
Platform(s) LABORATORY
Sensor(s): MASS SPECTROMETERS
Version: V1
Data Contributor(s): Michael Bender, Audrey Yau
Please contact the data provider for the correct Data Citation for this data set.

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Detailed Data Description

These data describe the analyses of the elemental and isotopic composition of O2, N2, and Ar and total air content made on the trapped air from three shallow ice cores (<34m depth) collected during the 2009 field campaign to Mullins Valley of the Dry Valleys, Antarctica. Refer to table 1 for the ice cores' locations.

Table 1. Ice Core Location
Core # Latitude Longitude
Core #1 77.87680° S 160.53720° E
Core #2 77.87679° S 160.53786° E
Core #3 77.87799° S 160.53572° E

The data include measurements of the δ40Ar/36Ar and δ38Ar/36Ar of the trapped air, providing ages to an uncertainty of ±220 kyr (1σ).

Format

Data are provided in a Microsoft Excel (.xlsx) file.

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File and Directory Structure

Data are available on the FTP site in the ftp://sidads.colorado.edu/pub/DATASETS/AGDC/nsidc0597_bender directory. The data are separated into two worksheets: Geochemical Data and Ar-Ages.

The Geochemical Data worksheet shows the δ18O, Δ17 of O2, δ15N, δAr/N2, δO2/N2, δO2/Ar, and total air content versus depth for each core. Standard deviations of modern air standards processed through the vacuum line as for ice core samples, for δ15N is ±0.014‰, for δAr/N2 is ±0.56‰, for δO2/N2 is ±0.78‰, for δO2/Ar is ±0.36‰, and for δ18O of O2 is ±0.31‰.

The Ar-Ages worksheet shows the δ40Ar/36Ar and δ38Ar/36Ar by depth for each core. For modern air (which serves as the standard), the standard deviations are ±0.053‰ and ±0.027‰ respectively. After correcting for thermal fractionation, the Ar isotopic composition is used to calculate an age, according to a rate of increase in 40Ar/37Ar of 0.066 ± 0.007‰/million years.

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File Size

The file size is 67 KB.

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Spatial Coverage

Mullins Valley, Dry Valleys, Antarctica: 77.87° S, 160.35° E

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Spatial Resolution

Core depths are <34 meters

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Temporal Coverage

Data extend from approximately 1.6 million years ago to present.

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Parameter or Variable

Depth (m)
Oxygen Isotopes (δ18O of O217Δ of O2)
Nitrogen Isotopes (δ15N)
Argon Isotopes (δ40Ar/36Ar, δ38Ar/36Ar)

Sample Data Record

Refer to Figures 1 and 2 for examples of the data from the Geochemical Data and Ar-Ages worksheets in the Yau_Mullins Data_NSIDC.xlsx data file.

sample data

Figure 1. Geochemical Data Sample Record

sample data

Figure 2. Ar-Ages Sample Record

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Software and Tools

Software and Tools

The data can be accessed using Microsoft Excel.

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Data Acquisition and Processing

Data Acquisition Methods

Ice cores were drilled during the austral summer of 2009. Ice recovery in all three cores was in excess of 95%. Visually, all three cores show evidence for brittle fracture and sand veins. The sand veins are most common in near-surface ice, but occur down to the base of Cores 1 and 2, and to at least 25 m depth in Core 3. Clean fractures, absent of sand, also truncate the cores.

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Processing Steps

Trapped air analyses were performed on a Finnigan Delta Plus XP and a Finnigan MAT 252, stable isotope ratio mass spectrometers

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References and Related Publications

Contacts and Acknowledgments

Dr. Michael L. Bender
Princeton University
Geosciences
M48 Guyot Hall
Princeton University Princeton, NJ 08544

Dr. Audrey M. Yau
Princeton University
Geosciences
M48 Guyot Hall
Princeton University Princeton, NJ 08544

Acknowledgments: 

This research was supported by NSF Antarctic Earth Sciences Grant Number ANT--0636731

Document Information

Document Creation Date

November 20, 2014

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