Entry_ID: NSIDC-0502
Entry_Title: Methane Isotopes in South Pole Firn Air, 2008
Group: Data_Set_Citation
   Dataset_Creator: Sowers, T
   Dataset_Title: Methane Isotopes in South Pole Firn Air, 2008
   Dataset_Release_Date: 2011-01-01
   Dataset_Release_Place: Boulder, Colorado USA
   Dataset_Publisher: NSIDC: National Snow and Ice Data Center
   Online_Resource: http://nsidc.org/data/nsidc-0502.html
   Dataset DOI: http://dx.doi.org/10.7265/N55T3HFP
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Todd
   Middle_Name: A.
   Last_Name: Sowers
   Email: tas11@psu.edu
   Phone: 1 814 865-1921 
   Group: Contact_Address
      Address: Penn State University
      Address: Earth and Environment Science Institute
      Address: 317b Earth and Engineering Science Building
      City: University Park
      Province_or_State: PA
      Postal_Code: 16802
      Country: USA
   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: Snow/Ice
   Variable_Level_1: Snow Depth
   Detailed_Variable: Meters Below Surface
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Paleoclimate
   Term: Ice Core Records
   Variable_Level_1: Isotopes
   Detailed_Variable: Delta Carbon-13 of Methane
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Paleoclimate
   Term: Ice Core Records
   Variable_Level_1: Isotopes
   Detailed_Variable: Delta Deuterium of Methane
End_Group
ISO_Topic_Category: Climatology/Meteorology/Atmosphere
Keyword: AGDC
Keyword: Antarctica
Keyword: Carbon
Keyword: CARBON-13
Keyword: CARBON ISOTOPES
Keyword: delta 13C
Keyword: deltaD
Keyword: delta deuterium
Keyword: Deuterium
Keyword: Firn
Keyword: firn air
Keyword: firn air chemistry
Keyword: Firn Air Isotope Measurements
Keyword: Firn Air Isotopes
Keyword: firn air samples
Keyword: Gas Isotopes
Keyword: ISOTOPES
Keyword: Methane
Keyword: methane isotopes
Keyword: Polar Firn Air
Keyword: Stable Isotopes
Sensor_Name: MASS SPECTROMETERS
Source_Name: GROUND-BASED OBSERVATIONS
Source_Name: LABORATORY
Group: Temporal_Coverage
   Start_Date: 2008-12-01
   Stop_Date: 2009-01-31
End_Group
Group: Paleo_Temporal_Coverage
   Paleo_Start_Date: 1900
   Paleo_Stop_Date: 2009
End_Group
Data_Set_Progress: complete
Group: Spatial_Coverage
   Minimum_Depth: 0 meters
   Maximum_Depth: 117.57 meters
End_Group
Group: Location
   Location_Category: CONTINENT
   Location_Type: ANTARCTICA
   Detailed_Location: SOUTH POLE
End_Group
Group: Quality

   The investigator analyzed 156 firn air samples from the 2008-2009 field season 
   and 44 standards for δ13C and δD of CH4. The average 
   standard deviation of replicate samples at each of the 18 depths was ±0.13‰ 
   and ±4.2‰ for δ13C and δD, respectively.

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: 51 KB
   Distribution_Format: Microsoft Excel
End_Group
Group: Distribution
   Distribution_Media: FTP
   Distribution_Size: 1 KB
   Distribution_Format: ASCII Text (.txt)
End_Group
Group: Reference

   Battle, M. et al. 1996. Atmospheric Gas Concentrations over the Past Century 
   Measured in Air from Firn at the South Pole. Nature 383, 231-235.

   Sowers, T., S. Bernard, O. Aballain, J. Chappellaz, J.M. Barnola, and T. 
   Marik. 2005. Records of the delta 13C of atmospheric CH4 over the last 2 
   centuries as recorded in Antarctic snow and ice. Global Biogeochemical Cycles 
   19, doi:10.1029/2004GB002408.

End_Group
Group: Summary

   This data set contains depth profiles for delta carbon-13 (δ13C) and 
   delta deuterium (δD) of methane (CH4) in South Pole firn air. 
   The investigators obtained air samples from two boreholes during December 2008 
   and January 2009, and subsequently determined isotope ratios at 18 depths. The 
   profiles represent a roughly 100-year history of the isotopic composition of 
   CH4 at South Pole Station (no depth-age model provided).

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

End_Group
Metadata_Name: CEOS IDN DIF
Metadata_Version: 9.7
DIF_Creation_Date: 2011-01-01
Last_DIF_Revision_Date: 2013-03-20
DIF_Revision_History:  Added DOI