Data Set ID:
NSIDC-0599

Carbonyl Sulfide Measurements in the Taylor Dome M3C1 Ice Core, Version 1

The data set includes carbonyl sulfide (COS) measurements made on air extracted from 53 samples from the Taylor Dome M3C1 ice core. COS was measured in air from the Taylor Dome ice core to reconstruct an atmospheric record for the Holocene (11-0 kyr B.P.) and part of the last glacial period (50-30 kyr B.P.).

NSIDC does not archive these data.

Parameter(s):
  • Atmospheric Chemistry > Sulfur Compounds > Carbonyl Sulfide > CARBONYL SULFIDE
  • Aerosols > Aerosol Optical Depth/Thickness > Depth
Data Format(s):
  • Excel
Spatial Coverage:
N: -77.4, 
S: -77.4, 
E: 157.4, 
W: 157.4
Platform(s):LABORATORY
Spatial Resolution:Not SpecifiedSensor(s):GAS CHROMATOGRAPHS, MASS SPECTROMETERS
Temporal Coverage:
  • 1 January 2008 to 31 December 2012
Version(s):V1
Temporal ResolutionNot specifiedMetadata XML:View Metadata Record
Data Contributor(s):Murat Aydin, Eric Saltzman

Geographic Coverage

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.

  • Aydin, M., T. J. Fudge, K. R. Verhulst, M. R. Nicewonger, E. D. Waddington, and E. Saltzman. 2014. Carbonyl sulfide hydrolysis in Antarctic ice cores and an atmospheric history for the last 8000 years, J. Geophys. Res. Atmos. 119. 8500-8514. https://doi.org/10.1002/2014JD021618

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Detailed Data Description

COS measurements in polar firn and ice have been used to assess the range of natural variability and the impact of human activities on atmospheric COS levels. Firn air studies showed that there had been large increases in atmospheric COS during the early part of the twentieth century, constraining the anthropogenic component in the present-day budget to about 30 percent of the total sources (Sturges et al.2001;Montzka 2004).

Ice core measurements suggest COS undergoes slow, in situ hydrolysis in ice core air bubbles (Aydin et al. 2014). The Taylor Dome M3C1 ice core was drilled to a depth of 555 m using n-butyl acetate as the drill fluid in 1993-1994. This COS data set includes 53 measurements from the 101-440 m depth range of the Taylor Dome M3C1 ice core. The measurements are not corrected for in situ loss to hydrolysis or for gravitational enrichment in the firn.

Format

Data are provided in Microsoft Excel (.xls) 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/nsidc0599_saltzman/ directory. Within this directory, there is one Microsoft Excel file: UCI carbonyl sulfide.xls.

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File Size

20 KB

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Spatial Coverage

Taylor Dome, East Antarctica: 77.40° S, 157.40° E

Spatial Resolution

101.1 meters to 439.7 meters

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Temporal Coverage

Data were collected from January 2008 to December 2012.

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Parameter or Variable

Depth (m)
Carbonyl Sulfide (COS) in parts per trillion (ppt)

Sample Data Record

Figure 1 is sample data from the UCI carbonyl sulfide.xls data file.

sample data
Figure 1. Carbonyl Sulfide Measurements
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Software and Tools

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Data Acquisition and Processing

Data Acquisition Methods

Air was extracted from the bubbles in 400-600 g ice core samples in a dry extraction system that involves mechanical shredding at 50°C under vacuum (Aydin et al. 20072008). Four different extraction chambers were used in this study. Each chamber is a closed-end stainless steel tube (20 cm long, 15 cm in diameter, electron beam welds, made from 316 L stainless steel) sealed with a copper gasket conflat flange. A flat cheese grater welded inside the chamber allows the ice core sample to shred under its own weight as the vessel is oscillated in a linear motion at 1 Hz and with a 1 5cm throw. It takes 15-20 minutes of shredding to liberate 60-70 percent of the air trapped in an ice core sample. Pumping and gas extraction is done through a 1.27 cm (1/2") ID stainless steel vacuum line that includes stainless steel bellows valves with alloy tips. The extracted air is frozen in a stainless steel tube immersed in liquid helium (4 K) and transferred to an automated preconcentration inlet system. The condensable constituents of air are trapped on glass beads at liquid nitrogen temperatures (77 K at 1 atm), transferred onto a fused silica capillary tube (0.2 5mm ID) also at 77 K, then thermally injected into an HP-5890 gas chromatograph. Chromatographic separation is achieved on a 60 m long DB-1 column with a temperature program that starts at 50°C and ramps to a final temperature of 150°C in 20 minutes. The analytes are quantified with a magnetic sector mass spectrometer (Waters Autospec Ultra) running at a mass resolution of ~8000 (m/Δm). An isotope-labeled internal standard (13COS) is added to each sample during the first trapping phase on glass beads, and the COS abundance is quantified from the ratio of signals from the labeled and unlabeled isotopomers. The system is calibrated using COS gas standards prepared in the laboratory at parts per billion levels in high-pressure Al cylinders and diluted to parts per trillion levels in humid N2 in electropolished stainless steel flasks.

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References and Related Publications

Contacts and Acknowledgments

Eric S. Saltzman
University of California, Irvine
Deptartment of Earth System Science
Croul Hall 1212
Irvine, CA 92697

Murat Aydin
University of California, Irvine
Deptartment of Earth System Science
Croul Hall 1212
Irvine, CA 92697

Acknowledgments: 

This research was supported by the National Science Foundaton (NSF) Division of Polar Programs (POLAR) Grant Number 0636953.

Document Information

Document Creation Date

October 2014

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