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Data Set ID:
NSIDC-0407

Nitrogen and Oxygen Gas Isotopes in the Siple Dome and Byrd Ice Cores, Antarctica, Version 1

This data set consists of Gas-isotopic data from the Siple Dome and and Greenland Ice Sheet Project 2 (GISP2) ice cores covering roughly the last 100,000 years (100 ka), consisting of d15N (15N/14N) of N2, d18O (18O/16O) of O2, dO2/N2, and dAr/N2. Derived parameters include d18Oatm, d15N, dO2/N2, and dAr/N2.

Data are available via FTP as ASCII text files (.txt) and Microsoft Excel files (.xls).

Geographic Coverage

Spatial Coverage:
  • N: -80.016667, S: -80.016667, E: -119.533333, W: -119.533333

Spatial Resolution: Not Specified
Temporal Coverage:
  • 1 January 2005 to 31 December 2008
Temporal Resolution: Not specified
Parameter(s):
  • Paleoclimate Reconstructions > Drought/Precipitation Reconstruction
  • Glaciers/Ice Sheets > Firn
  • Glaciers/Ice Sheets
  • Ice Core Records > Ice Core Air Bubbles
  • Ice Core Records
  • Glaciers/Ice Sheets > Ice Sheets
  • Sea Ice > Isotopes
  • Ice Core Records > Isotopes
  • Atmospheric Chemistry > Oxygen Compounds > Molecular Oxygen
  • Snow/Ice
Platform(s) FIELD INVESTIGATION, FIELD SURVEYS, LABORATORY
Sensor(s): CORING DEVICES, MASS SPECTROMETERS
Data Format(s):
  • Microsoft Excel
Version: V1
Data Contributor(s): Jeffrey Severinghaus

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.

Severinghaus, J. P. 2009. Nitrogen and Oxygen Gas Isotopes in the Siple Dome and Byrd Ice Cores, Antarctica, Version 1. [Indicate subset used]. Boulder, Colorado USA. NSIDC: National Snow and Ice Data Center. doi: http://dx.doi.org/10.7265/N55X26V0. [Date Accessed].

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Detailed Data Description

Format

Data are available as an ASCII text file (.txt) and a Microsoft Excel file (.xls).

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File and Directory Structure

Data are available on the FTP site in the ftp://sidads.colorado.edu/pub/DATASETS/AGDC/severinghaus_nsidc_0407/ directory. 

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File Naming Convention

Files are named according to the following convention:

Data_Severinghaus_etal2009.txt

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File Size

Files in this data set range in size from 1.8 MB to 2.3 MB.

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Volume

The total volume of the data set is less than 4.1 MB.

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Spatial Coverage

Data were collected at Siple Dome, Antarctica and the Greenland Ice Sheet Project 2 (GISP2) ice core, Greenland.

Southernmost Latitude: 80°01'S 
Northernmost Latitude: 80°01'S 
Westernmost Longitude: 119°32'W
Easternmost Longitude: 119°32'W

Spatial Coverage Map

Core location sites

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Temporal Coverage

Cores in this collection were obtained at Siple Dome, West Antarctica (81.65°S, 148.81°W) during the 1994/1995 field season, and at Greenland Ice Sheet Project 2 (GISP2) ice core in Greenland (1998).

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Parameter or Variable

Parameters are measurements of d18Oatm of Oxygen, d15Nof Nitrogen, dO2/N2, and dAr/N2

Sample Data Record

The following example shows sample data from the Data_Severinghaus_etal2009.txt. 
Siple Dome 18O of O2 :

rep
d15N
d18O
dO2/N2
dAr/N2
a
0.204
0.445
-13.44
-6.56
a
0.191
0.438
-13.02
-6.26
a
0.2
0.428
-10.39
-4.77
a
0.202
0.431
-11.1
-4.98
a
0.196
0.405
-9.02
-4.74
a
0.193
0.4
-11.04
-5.61
a
0.196
0.43
-13.4
-7.15
a
0.207
0.437
-13.9
-7.5
a
0.206
0.431
-8.43
-3.26
a
0.191
0.39
-7.81
-3.39
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Software and Tools

Data are accessible using standard spreadsheet software.

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Data Acquisition and Processing

Theory of Measurements

Delta18Oatm is a useful variable for correlating ice cores, and for inferring information about past climate and ice extent. At any given time, delta18O is approximately constant throughout the atmosphere, but this value varies over time due to changes in the hydrologic cycle, ice sheet volume, and worldwide patterns of plant growth.

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Data Acquisition Methods

The nitrogen and oxygen gas isotopes were analyzed using cores obtained at Siple Dome, West Antarctica (81.65°S, 148.81°W) during the 1994/1995 field season, and Greenland Ice Sheet Project 2 (GISP2) ice core in Greenland.

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Sensor or Instrument Description

The nitrogen and oxygen gas isotopes were analyzed on a ThermoFinnigan MAT Delta Plus XP isotope ratio mass spectrometer with 8 Faraday cups for simultaneous integration of mass/charge 28, 29, 32, 34, and 40 ion beams.

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References and Related Publications

Contacts and Acknowledgments

Dr. Jeffrey Severinghaus 
Scripps Institution of Oceanograpy 
University of California, San Diego 
9500 Gilman Drive 
La Jolla CA, 92093 
Mail Code: 0244

Acknowledgements: 

This research was supported by NSF OPP grant 0440975 .

Document Information

Document Creation Date

01 July 2009

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No FAQs or How Tos available for this data set.

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