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Data Set ID:
NSIDC-0122

Snow-atmosphere Transfer Function for Reversibly Deposited Chemical Species in West Antarctica, Version 1

This data set is part of the West Antarctic Ice Sheet Cores (WAISCORES) project, an NSF-funded project to understand the influence of the West Antarctic Ice Sheet on climate and sea level change. WAISCORES researchers acquired and analyzed snow pit and core samples from the Siple Dome, in the Siple Coast region, West Antarctica. This data set includes glaciochemical spatial variability data for six Siple Dome snow pits. Samples involved measuring hydrogen peroxide (H2O2) and formaldehyde (HCHO) in the air, snow, firn, and ice via suppressed ion chromatography. The data can be used to interpret changes in concentrations of these species recorded in ice cores. Data in this collection were obtained during two Antarctic field seasons in 1994 to 1995 and 1996 to 1997. Data are available via FTP in tab-delimited ASCII text (.dat, .txt) file format.

Geographic Coverage

Parameter(s):
  • Atmospheric Chemistry > Hydrogen Compounds > Hydroperoxy
  • Snow/Ice > Snow/Ice Chemistry
Spatial Coverage:
  • N: -81, S: -81, E: -149, W: -149

Spatial Resolution: Not Specified
Temporal Coverage:
  • 1 November 1996 to 28 February 1997
  • 1 November 1994 to 28 February 1995
Temporal Resolution: Not specified
Data Format(s):
  • ASCII Text
Platform(s) Not specified
Sensor(s): Not specified
Version: V1
Data Contributor(s): Roger Bales, Joseph McConnell
Data Citation

As a condition of using these data, you must cite the use of this data set using the following citation. For more information, see our Use and Copyright Web page.

Bales, R. and J. McConnell. 2002. Snow-atmosphere Transfer Function for Reversibly Deposited Chemical Species in West Antarctica, Version 1. [Indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi: http://dx.doi.org/10.7265/N5ZP441W. [Date Accessed].

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Detailed Data Description

Format

Data are available as tab-delimited ASCII text files (.dat, .txt).

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File and Directory Structure

Data are available on the FTP site in the ftp://sidads.colorado.edu/pub/DATASETS/AGDC/waiscores/bales/ directory. Table 1 lists the files in this directory:

Table 1. Files in the /AGDC/waiscores/bales/ directory
File Name Description
94pita_h2o2.dat
94pitb_h2o2.dat
94pitc_h2o2.dat
Hydrogen peroxide (H2O2) and formaldehyde (HCHO) measurements for snow pits 1, 2 and 6 from UNH, 1994
96pit1_h2o2.dat
96pit2_h2o2.dat
96pitb_h2o2.dat
Hydrogen peroxide (H2O2) and formaldehyde (HCHO) measurements for snow pits, 1996
metah2o2.txt Notes related to the data set, available as an ASCII text file
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File Naming Convention

Files are named according to the following convention and as described in Table 2:

YYpitX_h2o2.dat

Where:

Table 2. File Naming Convention
Variable Description
YY 2-digit year, 94 or 96
X Snow pit site identification:
  • Snow pits 1, 2 and 6 from UNH for 1994 season, a, b, c
  • Snow pit near the science Jamesway in 1996 season, 1
  • Snow pit dug with M. Albert in 1996 season, 2
  • Backlit "B" snow pit in 1996 season, b
.dat File extension
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File Size

The data set contains 7 files ranging in size from 1 KB to 7 KB.

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Volume

The total volume of the data set is 40 KB.

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Spatial Coverage

Ice core data were collected at the Siple Dome site in the Siple Coast region of Antarctica.

Southernmost Latitude: 81°S
Northernmost Latitude: 81°S
Westernmost Longitude: 149°W
Easternmost Longitude: 149°W

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Temporal Coverage

Data were obtained during two Antarctic field seasons (November to February) in 1994 to 1995 and 1996 to 1997.

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Parameter or Variable

Parameters for hydrogen peroxide concentration analysis include the depth in meters (m) and hydrogen peroxide (H2O2) concentration in micromolars (uM).

Parameter Description

Chemical species data files include depth and concentration measurements for snow pits at Siple Dome summit. Table 3 provides details on the files and parameters.

Table 3. Chemical Species Data Files and Parameters
Parameter Description
Chemical Species Analysis
Hydrogen Peroxide Concentration File containing atmospheric concentrations of hydrogen peroxide in micromolars (uM) and depth in meters (m)

Sample Data Record

Below is a sample record of the hydrogen peroxide (H2O2) concentration analysis data files from 96pitb_h2o2.dat. Only the first four data records are shown.

Hydrogen Peroxide Analysis:

H2O2 (uM) Depth (m)
12.9412 -0.005
10.1471 -0.015
7.38235 -0.025
3.11765 -0.035
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Software and Tools

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Data Acquisition and Processing

Snow pit and core samples were collected at three snow pits on the Siple Dome summit during the 1994 to 1995 season and at three snow pits during the 1996 to 1997 season. Samples were analyzed at high resolution for hydrogen peroxide (H2O2) concentration. Workers used nonparticulating suits, polyethylene gloves, and particle masks to collect all snow pit and core samples without chemical contamination. Hydrogen peroxide concentration measurements were measured via suppressed ion chromatography. For more information on data acquisition and processing methods, see the researchers' notes in metah2o2.txt, the Major Findings, and the References and Related Publications listed below.

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References and Related Publications

Contacts and Acknowledgments

Dr. Roger Bales
University of Arizona
Department of Hydrology and Water Resources
Tucson, AZ 85721
USA

Dr. Joseph McConnell
Desert Research Institute
Division of Hydrological Sciences
2215 Raggio Parkway
Reno, NV 89512
USA

Acknowledgments: 

This research was supported by NSF ANT grant 9526572.

Document Information

DOCUMENT CREATION DATE

28 December 2009

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