Entry_ID: NSIDC-0098
Entry_Title: Firn Air Isotope and Temperature Measurements from Siple Dome and South Pole
Group: Data_Set_Citation
   Dataset_Creator: J.P. Severinghaus, A. Grachev, and M. Battle
   Dataset_Title: Firn Air Isotope and Temperature Measurements from Siple Dome and South Pole
   Dataset_Release_Date: 2001-01-01
   Dataset_Release_Place: Boulder, Colorado USA
   Dataset_Publisher: NSIDC: National Snow and Ice Data Center
   Online_Resource: http://nsidc.org/data/nsidc-0098.html
   Dataset DOI: http://dx.doi.org/10.7265/N51N7Z2P
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Jeffrey
   Middle_Name: P.
   Last_Name: Severinghaus
   Email: jseveringhaus@ucsd.edu
   Phone: 1 858 822.2483 
   Fax: 1 858  822.3310 
   Group: Contact_Address
      Address: Scripps Institution of Oceanography
      Address: 9500 Gilman Dr.
      City: La Jolla
      Province_or_State: CA
      Postal_Code: 92037-0244
      Country: USA
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: A.
   Last_Name: Grachev
   Group: Contact_Address
      Address: Scripps Institution of Oceanography,
      Address: University of California at San Diego
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Mark
   Last_Name: Battle
   Group: Contact_Address
      Address: Bowdoin College,
      Address: Brunswick, Maine
   End_Group
End_Group
Group: Personnel
   Role: Technical Contact
   First_Name: NSIDC
   Last_Name: User Services
   Email: nsidc@nsidc.org
   Phone: 1 303 492-6199 x
   Fax: 1 303  492-2468 x
   Group: Contact_Address
      Address: National Snow and Ice Data Center
      Address: CIRES, 449 UCB
      Address: University of Colorado
      City: Boulder
      Province_or_State: CO
      Postal_Code: 80309-0449
      Country: USA
   End_Group
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Cryosphere
   Term: Glaciers/Ice Sheets
   Variable_Level_1: Ice Sheets
   Detailed_Variable: Firn Air Isotopes
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Cryosphere
   Term: Snow/Ice
   Variable_Level_1: Snow/Ice Temperature
   Detailed_Variable: Firn Temperature
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Paleoclimate
   Term: Ice Core Records
   Variable_Level_1: Ice Core Air Bubbles
   Detailed_Variable: Firn Air
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Paleoclimate
   Term: Ice Core Records
   Variable_Level_1: Isotopes
   Detailed_Variable: Firn Air Isotopes
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Terrestrial Hydrosphere
   Term: Glaciers/Ice Sheets
   Variable_Level_1: Ice Sheets
   Detailed_Variable: Firn Air Isotopes
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Terrestrial Hydrosphere
   Term: Snow/Ice
   Variable_Level_1: Snow/Ice Temperature
   Detailed_Variable: Firn Temperature
End_Group
Keyword: Antarctica
Keyword: Argon Isotopes
Keyword: Atmospheric Gases
Keyword: Boreholes
Keyword: Firn Air Isotope Measurements
Keyword: Firn Air Isotopes
Keyword: Firn Isotopes
Keyword: Firn Temperature Measurements
Keyword: Gas Isotopes
Keyword: Ice Core Gas Records
Keyword: Isotopic Anomalies
Keyword: Isotopic History
Keyword: Krypton
Keyword: mass spectrometers
Keyword: Mass Spectrometry
Keyword: Nitrogen Isotopes
Keyword: NSIDC
Keyword: NSIDC-0098
Keyword: Oxygen Isotopes
Keyword: Polar Firn Air
Keyword: Seasonal Temperature Changes
Keyword: Seasonal Temperature Gradients
Keyword: Shallow Firn Air
Keyword: Siple Dome
Keyword: South Pole
Keyword: Thermal Diffusion
Keyword: Thermal Fractionation
Keyword: Trapped Air Bubbles
Keyword: Xenon
Sensor_Name: FLASKS
Sensor_Name: MASS SPECTROMETERS
Sensor_Name: THERMISTORS
Source_Name: GROUND-BASED OBSERVATIONS
Source_Name: GROUND STATIONS
Data_Set_Progress: complete
Group: Spatial_Coverage
   Southernmost_Latitude: -81.667
   Northernmost_Latitude: -81.667
   Westernmost_Longitude: -148.767
   Easternmost_Longitude: -148.767
End_Group
Group: Spatial_Coverage
   Southernmost_Latitude: -89.997
   Northernmost_Latitude: -89.997
   Westernmost_Longitude: -102
   Easternmost_Longitude: -102
End_Group
Group: Location
   Location_Category: CONTINENT
   Location_Type: ANTARCTICA
   Detailed_Location: SIPLE DOME
End_Group
Group: Data_Resolution
   Vertical_Resolution: 1 m to 9 m
End_Group
Data_Set_Language: English
Originating_Center: AGDC
Group: Data_Center
   Data_Center_Name: NSIDC > National Snow and Ice Data Center
   Data_Center_URL: http://nsidc.org
   Group: Personnel
      Role: Data Center Contact
      First_Name: NSIDC
      Last_Name: User Services
      Email: nsidc@nsidc.org
      Phone: 1 303 492-6199 
      Fax: 1 303  492-2468 
      Group: Contact_Address
         Address: National Snow and Ice Data Center
         Address: CIRES, 449 UCB
         Address: University of Colorado
         City: Boulder
         Province_or_State: CO
         Postal_Code: 80309-0449
         Country: USA
      End_Group
   End_Group
End_Group
Group: Data_Center
   Data_Center_Name: AGDC > Antarctic Glaciological Data Center
   Data_Center_URL: http://nsidc.org/agdc/
   Group: Personnel
      Role: Data Center Contact
      First_Name: AGDC
      Last_Name: User Services
      Email: nsidc@nsidc.org
      Phone: 1 303 492-6199 x
      Fax: 1 303  492-2468 x
      Group: Contact_Address
         Address: National Snow and Ice Data Center
         Address: CIRES, 449 UCB
         Address: University of Colorado
         City: Boulder
         Province_or_State: CO
         Postal_Code: 80309-0449
         Country: USA
      End_Group
   End_Group
End_Group
Group: Distribution
   Distribution_Media: FTP
   Distribution_Size: 1 - 5 KB
   Distribution_Format: Microsoft Excel
End_Group
Group: Distribution
   Distribution_Media: FTP
   Distribution_Size: 1 - 5 KB
   Distribution_Format: ASCII Text (.txt)
End_Group
Group: Multimedia_Sample
   File: http://nsidc.org/data/docs/agdc/nsidc0098_severinghaus/images/nsi0098_locator.jpg
   Caption: Sample Location Map
End_Group
Group: Reference

   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.

   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.

End_Group
Group: Summary

   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.

End_Group
IDN_Node: USA/NOAA
Metadata_Name: CEOS IDN DIF
Metadata_Version: 9.7
DIF_Creation_Date: 2001-01-01
Last_DIF_Revision_Date: 2014-03-13
DIF_Revision_History: Removed USADCC logo for Search cleanup.