IEDA
Metadata
Resource Type
Dataset
Data DOI
AMD - DIF Record(s)
Repository (current):
USAP-DC
Repository (original):
NSIDC
Title
Firn Air Isotope and Temperature Measurements from Siple Dome and South Pole
Abstract
This data set includes d15N, d18O/2, dO2/N2/4, d40Ar/4, d38/Ar/2, d84Kr/48, and d132Xe/96 values for air drawn from the top 15 to 50 m of firn at the South Pole (summer and winter 1998) and a site at Siple Dome (summers 1996 and 1998). Data also include related firn temperature measurements. The objective of this research was to better understand thermal fractionation processes affecting records of atmospheric history from firn and ice core gases. Recent work (e.g., Severinghaus and Brook, 1999) has exploited trapped air in ice and deep firn as a record of past atmospheric composition and climate change. Interpretation of these paleoclimate archives is complicated by artifacts of thermal diffusion, a process in which heavier gases migrate down temperature gradients toward colder regions in the firn. Seasonal temperature change at the snow surface creates strong temperature gradients in the top few meters of the firn, which cause isotopic fractionation of firn gases. A specific goal of this research is to identify any long-term effects of seasonal temperature fluctuations on firn air isotopic anomalies.
Date Created
2001-01-01
Creator(s)
Severinghaus, J. P., A. Grachev, and M. Battle.
Spatial Extent(s)
West: -148.767
East: -148.767
South: -81.667
North: -81.667
West: -102
East: -102
South: -89.997
North: -89.997
Temporal Extent(s)
Start: 1998-01-14
End: 1998-07-28
Version
1
Language
English
References
  1. Severinghaus, J.P., A. Grachev, and M. Battle. 2001. Thermal fractionation of air in polar firn by seasonal temperature gradients. Geochemistry, Geophysics, Geosystems [online journal] 2: Paper no. 2000GC000146.
  2. Severinghaus, J.P. and E.J. Brook, 1999. Abrupt climate change at the end of the last glacial period inferred from trapped air in polar ice. Science 286: 930-934.
Supplemental Docs
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nsidc0098_UG.pdf
Data Files
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4.8 kB
firn_air_isotopes.txt
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4.9 kB
firn_air_isotopes.xls
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865 Bytes
firn_temps.txt
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854 Bytes
firn_temps.xls
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7.8 kB
nsidc-0098_fgdc.xml