[Parameters: Topic='CRYOSPHERE', Term='SEA ICE', Variable_Level_1='ISOTOPES']
Firn Air Inert Gas and Oxygen Observations from Siple Dome, 1996, and the South Pole, 2001Entry ID: NSIDC-0290
Abstract: This data set includes gas ratios in polar firn air: O2/N2, 15N/14N, 40Ar/N2, 40Ar/36Ar, 40Ar/38Ar, 84Kr/36Ar, 132Xe/36Ar, and 22Ne/36Ar. Investigators sampled air from the permeable snowpack (firn) layer at two sites: Siple Dome, Antarctica in 1996 and at the South Pole in 2001. They observed and modeled the processes of gravitational settling, thermal fractionation, and preferential exclusion of ... small gas molecules from closed air bubbles. The purpose of this study was to understand these physical processes, which affect the composition of bubbles trapped in ice. By measuring these gas ratios in the ancient air preserved in bubbles trapped in ice, researchers can determine past atmospheric composition and local temperature changes along with the relative timing and magnitude of such events.
The data file is available in Microsoft Excel format. The research paper is available in PDF. Data and the research paper are available via FTP.
Data Set Citation
Dataset Originator/Creator: Jeffery P. Severinghaus
Dataset Title: Firn Air Inert Gas and Oxygen Observations from Siple Dome, 1996, and the South Pole, 2001
Dataset Release Date: August 17, 2006
Dataset Release Place: Boulder, Colorado USA
Dataset Publisher: National Snow and Ice Data Center (NSIDC)
Data Presentation Form: Digital mediaOnline Resource: http://nsidc.org/data/nsidc-0290.html
Start Date: 1996-12-15Stop Date: 1996-12-21
Start Date: 2001-01-21Stop Date: 2001-01-21
CRYOSPHERE > GLACIERS/ICE SHEETS > ICE SHEETS
CRYOSPHERE > SNOW/ICE
TERRESTRIAL HYDROSPHERE > GLACIERS/ICE SHEETS > ICE SHEETS
TERRESTRIAL HYDROSPHERE > SNOW/ICE
PALEOCLIMATE > ICE CORE RECORDS > ICE CORE AIR BUBBLES
CRYOSPHERE > SNOW/ICE > SNOW/ICE CHEMISTRY
TERRESTRIAL HYDROSPHERE > SNOW/ICE > SNOW/ICE CHEMISTRY
CRYOSPHERE > SEA ICE > ISOTOPES
OCEANS > SEA ICE > ISOTOPES
CRYOSPHERE > GLACIERS/ICE SHEETS > FIRN
TERRESTRIAL HYDROSPHERE > GLACIERS/ICE SHEETS > FIRN
ISO Topic Category
Distribution Media: FTP
Distribution Size: 177 KB
Distribution Format: Microsoft Excel
Distribution Media: FTP
Distribution Size: 975 KB
Distribution Format: PDF
Email: jseveringhaus at ucsd.edu
Scripps Institution of Oceanography 9500 Gilman Dr.
City: La Jolla
Province or State: CA
Postal Code: 92093-0244
Email: mbattle at bowdoin.edu
Dept. of Physics and Astronomy Bowdoin College 8800 College Station
Province or State: ME
Postal Code: 04011-8488
Phone: 609 258-2936
Fax: 609 258 0796
Email: bender at princeton.edu
Department of Geosciences Princeton University M48 Guyot Hall
Province or State: NJ
Postal Code: 08544
Role: TECHNICAL CONTACT
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc at nsidc.org
National Snow and Ice Data Center CIRES, 449 UCB University of Colorado
Province or State: CO
Postal Code: 80309-0449
Bender, M. L., T. Sowers, J. -M. Barnola, and J. Chappellaz. 1994.
Changes in the O2/N2 ratio of the atmosphere during recent decades
reflected in the composition of air in the firn at Vostok Station,
Antarctica. Geophysical Research Letters 21 189\226192.
Bender, M. L., P. P. Tans, J. T. Ellis, J. Orchardo, and K. Habfast. 1994. A
high-precision isotope ... ratio mass-spectrometry method for measuring the
O2/N2 ratio of air. Geochimica et Cosmochimica Acta 58 4751\2264758.
Bender, M. L., D. T. Ho, M. B. Hendricks, R. Mika, M. O. Battle, P. P.
Tans, T. J. Conway, B. Sturtevant, and N. Cassar. 2005. Atmospheric O2/
N2 changes, 1993\2262002: implications for the partitioning of fossil fuel
CO2 sequestration. Global Biogeochemical Cycles 19 GB4017.
Severinghaus, J. P., A. Grachev, B. Luz, and N. Caillon. 2003. A method
for precise measurement of argon 40/36 and krypton/argon ratios in
trapped air in polar ice with applications to past firn thickness and
abrupt climate change in Greenland and at Siple Dome, Antarctica.
Geochimica et Cosmochimica Acta 67 325\226343.
Severinghaus, J. P., and M. O. Battle. 2006. Fractionation of gases in
polar ice during bubble close-off: new constraints from firn air Ne, Kr
and Xe observations. Earth and Planetary Science Letters EPSL-08011.
Creation and Review Dates
DIF Creation Date: 2006-08-24
Last DIF Revision Date: 2009-01-08