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This data set consists of Gas-isotopic data from the Siple Dome and Byrd 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 past changes in the Dole Effect and the fractionation that causes the Dole Effect.
Data are available via FTP as ASCII text files (.txt) and Microsoft Excel files (.xls).
To broaden awareness of our services, NSIDC requests that you acknowledge the use of data sets distributed by NSIDC. Please refer to the citation below for the suggested form, or contact NSIDC User Services for further information. We also request that you send us one reprint of any publication that cites the use of data received from our Center. This helps us to determine the level of use of the data we distribute. Thank you.
The following example shows how to cite the use of this data set in a publication. List the principal investigators, year of data set release, publisher: NSIDC, and digital media
Severinghaus, J. 2009. Nitrogen and oxygen gas isotopes in the Siple Dome and Byrd ice cores, Antarctica. Boulder, Colorado, USA: National Snow and Ice Data Center. Digital media.
| Category | Description |
|---|---|
| Data format | ACSII text file (.txt), Microsoft Excel file (.xls). |
| Spatial coverage and resolution | Southernmost Latitude:80°01'S Northernmost Latitude: 80°01'S Westernmost Longitude: 119°32'W Easternmost Longitude: 119°32'W |
| Temporal coverage and resolution | 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 Byrd Station (80°01'S, 119°32'W) during the 1967-68 austral summer. |
| File naming convention | filename Data_Severinghaus_etal2009.txt |
| File size | Files in this data set range in size from 1.8 MB to 2.3 MB, for a total of 4.1 MB. |
| Parameter(s) | Parameters are measurements of d18Oatm of Oxygen, d15Nof Nitrogen, dO2/N2, and dAr/N2 |
| Procedures for obtaining data | Data are available via FTP. |
Dr. Jeffrey Severinghaus
Scripps Institution of Oceanograpy
University of California, San Diego
9500 Gilman Drive
La Jolla CA, 92093
Mail Code: 0244
NSIDC User Services
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
Boulder, CO 80309-0449 USA
phone: +1 303.492.6199
fax: +1 303.492.2468
form: Contact NSIDC User Services
e-mail: nsidc@nsidc.org
This research was supported by NSF OPP grant 0440975 .
Data are available as an ASCII text file (.txt) and a Microsoft Excel file (.xls).
Data are available on the FTP site
in the ftp://sidads.colorado.edu/pub/DATASETS/AGDC/severinghaus_nsidc_0407/ directory.
Files are named according to the following convention:
Data_Severinghaus_etal2009.txt
Files in this data set range in size from 1.8 MB to2.3 MB, for a total of 4.1 MB.
Data were collected at Siple Dome and Byrd Station, Antarctica
Southernmost Latitude: 80°01'S
Northernmost Latitude: 80°01'S
Westernmost Longitude: 119°32'W
Easternmost Longitude: 119°32'W
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 Byrd Station (80°01'S, 119°32'W) during the 1967-68 austral summer.
Parameters are measurements of d18Oatm of Oxygen, d15Nof Nitrogen, dO2/N2, and dAr/N2
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 |
Data are available via FTP.
The total volume of the data set is less than 4.1 MB.
Data are accessible using standard spreadsheet software.
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.
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.
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 at Byrd Station (80°01'S, 119°32'W) during the 1967-68 austral summer.
Severinghaus, J.P., R. Beaudette, M. Headly, K. Taylor, E.J. Brook, Oxygen-18 of O2 Records the Impact of Abrupt Climate Change on the Terrestrial Biosphere, Science 324, 1431-1434 (2009). doi: 10.1126/science.1169473
The following acronyms are used in this document.
| Acronym | Description |
|---|---|
| FTP | File Transfer Protocol |
| NSIDC | National Snow and Ice Data Center |
| URL | Uniform Resource Locator |
| ka | one thousand years |
| d15N | (15N/14N) of N2 (nitrogen) |
| d18O | (18O/16O) of O2 (oxygen) |
| dO2/N2 | delta oxygen and nitrogen |
| dAr/N2 | delta argon and nitrogen |
| MB | megabyte |
01 July 2009
http://nsidc.org/data/docs/agdc/nsidc0407_severinghaus/index.html
