Entry_ID: NSIDC-0435
Entry_Title: Methane Isotopes from the WAIS Divide Ice Core
Group: Data_Set_Citation
   Dataset_Creator: Sowers, Todd
   Dataset_Title: Methane Isotopes from the WAIS Divide Ice Core
   Dataset_Release_Date: 2009-12-01
   Dataset_Release_Place: Boulder, Colorado USA
   Dataset_Publisher: NSIDC: National Snow and Ice Data Center
   Online_Resource: http://nsidc.org/data/nsidc-0435.html
   Dataset DOI: http://dx.doi.org/10.7265/N5J67DW0
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: Glaciers/Ice Sheets
   Variable_Level_1: Ice Sheets
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Cryosphere
   Term: Snow/Ice
   Variable_Level_1: Snow/Ice Chemistry
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Paleoclimate
   Term: Ice Core Records
   Variable_Level_1: Isotopes
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Paleoclimate
   Term: Ice Core Records
   Variable_Level_1: Methane
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Terrestrial Hydrosphere
   Term: Snow/Ice
   Variable_Level_1: Snow/Ice Chemistry
End_Group
ISO_Topic_Category: Climatology/Meteorology/Atmosphere
Keyword: Firn Air Isotopes
Keyword: Ice Sheet
Keyword: West Antarctic Ice Sheet
Sensor_Name: MASS SPECTROMETERS
Sensor_Name: SPECTROMETERS
Source_Name: FIELD INVESTIGATION
Source_Name: FIELD SURVEYS
Source_Name: LABORATORY
Group: Temporal_Coverage
   Start_Date: 2008-01-01
   Stop_Date: 2008-12-30
End_Group
Group: Paleo_Temporal_Coverage
   Paleo_Start_Date: 1000 ybp
   Paleo_Stop_Date: present
   Group: Chronostratigraphic_Unit
      Eon: Phanerozoic
      Era: Cenozoic
      Period: Cenozoic
   End_Group
End_Group
Data_Set_Progress: complete
Group: Spatial_Coverage
   Southernmost_Latitude: -79.47
   Northernmost_Latitude: -79.47
   Westernmost_Longitude: 112.09
   Easternmost_Longitude: 112.09
   Minimum_Altitude: 1766 meters
   Maximum_Altitude: 1766 meters
   Maximum_Depth: 300 meters
End_Group
Group: Location
   Location_Category: CONTINENT
   Location_Type: ANTARCTICA
End_Group
Group: Location
   Location_Category: GEOGRAPHIC REGION
   Location_Type: POLAR
End_Group
Group: Data_Resolution
   Vertical_Resolution: 0.1 meters
   Temporal_Resolution: 5 years
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: 32 KB
   Distribution_Format: Microsoft Excel
End_Group
Group: Reference

   Mischler, J. A., T. A. Sowers, R. B. Alley, M. Battle, J. R. McConnell, L. 
   Mitchell, T. Popp, E. Sofen, and M. K. Spencer. 2009. Carbon and hydrogen 
   isotopic composition of methane over the last 1000 years, Global Biogeochem. 
   Cycles, 23, GB4024, doi:10.1029/2009GB003460.

   Sowers, T. 2006.  Late Quaternary atmospheric CH4 isotope record suggests 
   marine clathrates are stable. Science 311: 838-841.

   Sowers, T., S. Bernard, O. Aballain, J. Chappellaz, J.-M. Barnola and T. 
   Marik. 2005. Records of the d13C of atmospheric CH4 over the last two 
   centuries as recorded in Antarctic snow and ice. Global Biogeochemical Cycles 
   19(GB2002).

   Sowers, T. A. 2009. Atmospheric methane isotope records covering the Holocene 
   period. Quaternary Science Reviews doi:10.1016/j.quascirev.2009.05.023.

End_Group
Group: Summary

   This data set includes methane (CH4) isotope data from the West Antarctic Ice 
   Sheet (WAIS) Divide ice core, WDC05A, in Antarctica. The data include depth, 
   gas age, and the isotopic composition of methane (∂13C and ∂D of 
   CH4). The ice core was collected during the 2005-2006 Antarctic field season. 
   The CH4 isotope data was generated in 2008 using wet extraction methodology. 
   Samples span the last 1,000 years, at a resolution of about 15 years. Data for 
   samples above 69 meters were from firn air, and data below 69 meters from ice. 
   The dating of the ice was based on continuous chemical analyses above 69 
   meters and Electrical Conductivity/Dielectric Property (ECM/DEP) measurements 
   from ice. Dating uncertainty is estimated to be better than five years.

   Data are available via FTP in Microsoft Excel (.xls) tab delimited format

End_Group
Group: Related_URL
   Group: URL_Content_Type
      Type: VIEW PROJECT HOME PAGE
   End_Group
   URL: http://nsidc.org/agdc/
   Description: View Project Home Page
End_Group
Metadata_Name: CEOS IDN DIF
Metadata_Version: 9.7
DIF_Creation_Date: 2009-12-01
Last_DIF_Revision_Date: 2013-03-20
DIF_Revision_History:  Added DOI