Entry_ID: NSIDC-0539
Entry_Title: Abrupt Change in Atmospheric CO2 During the Last Ice Age
Group: Data_Set_Citation
   Dataset_Creator: Brook, E. J. and J. Ahn. 
   Dataset_Title: Abrupt Change in Atmospheric CO2 During the Last Ice Age
   Dataset_Release_Date: 2013-08-08
   Dataset_Release_Place: Boulder, Colorado USA
   Dataset_Publisher: NSIDC: National Snow and Ice Data Center
   Online_Resource: http://nsidc.org/data/nsidc-0539.html
   Dataset DOI: http://dx.doi.org/10.7265/N5F47M23
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: Personnel
   Role: Investigator
   First_Name: Edward
   Middle_Name: J
   Last_Name: Brook
   Email: brooke@geo.oregonstate.edu
   Phone: 1 541 737-8197 
   Group: Contact_Address
      Address: Oregon State University
      Address: Department of Geosciences
      Address: 104 Wilkinson Hall
      City: Corvallis
      Province_or_State: OR
      Postal_Code: 97331-5506
      Country: USA
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Jinho
   Last_Name: Ahn
   Email: jinhoahn@snu.ac.kr
   Phone: 1 541 737-1377 x
   Group: Contact_Address
      Address: Seoul National University
      Address: School of Earth and Environmental Sciences
      Address: 599 Kwanak-ro
      Address: Kwanak-gu
      Address: School of Earth and Environmental Sciences
      Address: Seoul National University
      Address: Seoul 151742, South Korea
      Country: Korea
   End_Group
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Paleoclimate
   Term: Ice Core Records
   Variable_Level_1: Carbon Dioxide
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Paleoclimate
   Term: Ice Core Records
   Variable_Level_1: Methane
End_Group
ISO_Topic_Category: Climatology/Meteorology/Atmosphere
Keyword: CH4 concentrations
Keyword: CO2 concentrations
Sensor_Name: CO2 ANALYZERS
Sensor_Name: GAS CHROMATOGRAPHS
Source_Name: GROUND-BASED OBSERVATIONS
Source_Name: LABORATORY
Group: Temporal_Coverage
   Start_Date: 2009-01-01
   Stop_Date: 2012-12-31
End_Group
Group: Paleo_Temporal_Coverage
   Paleo_Start_Date: 37 ka
   Paleo_Stop_Date: 47 ka
   Group: Chronostratigraphic_Unit
      Eon: Phanerozoic
      Era: Cenozoic
      Period: Quaternary
      Epoch: Quaternary
   End_Group
End_Group
Group: Paleo_Temporal_Coverage
   Paleo_Start_Date: 37 ka
   Paleo_Stop_Date: 47 ka
   Group: Chronostratigraphic_Unit
      Eon: Phanerozoic
      Era: Cenozoic
      Period: Quaternary
      Epoch: Quaternary
   End_Group
End_Group
Data_Set_Progress: complete
Group: Spatial_Coverage
   Southernmost_Latitude: -81.66
   Northernmost_Latitude: -81.66
   Westernmost_Longitude: -148.82
   Easternmost_Longitude: -148.82
   Minimum_Depth: 819 meters
   Maximum_Depth: 905 meters
End_Group
Group: Spatial_Coverage
   Southernmost_Latitude: -80.01
   Northernmost_Latitude: -80.01
   Westernmost_Longitude: -119.83
   Easternmost_Longitude: -119.83
   Minimum_Depth: 1685.1 meters
   Maximum_Depth: 1814.5 meters
End_Group
Group: Location
   Location_Category: CONTINENT
   Location_Type: ANTARCTICA
End_Group
Project: NSF/OPP > Division of Polar Programs, Antarctic Research, Glaciology
Data_Set_Language: English
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: 42 KB
   Distribution_Format: Microsoft Excel
End_Group
Group: Reference

   Ahn, J., and E. J. Brook. 2008. Atmospheric CO2 and Climate on Millennial Time 
   Scales during the Last Glacial Period. Science, 322, 83 - 85, 
   doi:10.1126/science.1160832.

   Ahn, Jinho, Edward J. Brook, Andreas Schmittner, and Karl Kreutz. 2013. Abrupt 
   Change in Atmospheric CO2 During the Last Ice Age. Geophysical Research 
   Letters, 39, L18711, doi:10.1029/2012GL053018.

   Ahn, Jinho., Edward J. Brook, and K. Howell. 2009. A High-precision Method for 
   Measurement of Paleoatmospheric CO2 in Small Polar Ice Samples. J. Glaciol., 
   55, 499-506, doi:10.3189/002214309788816731.

   Anderson, R. F., et al. 2009. Wind-driven Upwelling in the Southern Ocean and 
   the Deglacial Rise in Atmospheric CO2. Science, 323, 1443-1448, 
   doi:10.1126/science.1167441.

   Bender, M., Todd Sowers, and V. Lipenkov. 1995. On the Concentrations of O2, 
   N2, and Ar in Trapped Gases from Ice Cores. J. Geophys. Res., 100, 
   18,651-18,660, doi:10.1029/94JD02212.

   Brook, Edward J., et al. 2005. Timing of Millennial-scale Climate Change at 
   Siple Dome, West Antarctica, During the Last Glacial Period. Quat. Sci. Rev., 
   24, 1333-1343, doi:10.1016/j.quascirev.2005.02.002.

   Blunier, T., and E. J. Brook. 2001. Timing of Millennial-scale Climate Change 
   in Antarctica and Greenland during the Last Glacial Period, Science, 291, 
   109-112, doi:10.1126/science.291.5501.109.

   Dlugokencky, E. J., et al. 2005. Conversion of NOAA Atmospheric Dry Air CH4 
   Mole Fractions to a Gravimetrically Prepared Standard Scale. J. Geophys. Res., 
   110, D18306, doi:10.1029/2005JD006035.

   EPICA Community Members. 2006. One-to-one Coupling of Glacial Climate 
   Variability in Greenland and Antarctica, Nature, 444, 195–198, 
   doi:10.1038/nature05301.

   Margari, V., et al. 2010. The Nature of Millennial-scale Climate Variability 
   during the Past Two Glacial Periods. Nattional Geoscience, 3, 127-131, 
   doi:10.1038/ngeo740.

   Mayewski, P. A., et al. 2009. State of the Antarctic and Southern Ocean 
   Climate System (SASOCS), Rev. Geophys., 47, RG1003, doi:10.1029/2007RG000231.

   Mitchell, L. E., Edward J. Brook, Todd Sowers, J. R. McConnell, and K. Taylor. 
   2011. Multidecadal Variability of Atmospheric Methane, 1000–1800 C.E. J. 
   Geophys. Res., 116, G02007, doi:10.1029/2010JG001441.

   Skinner, L. C., and H. Elderfield. 2007. Rapid Fluctuations in the Deep North 
   Atlantic Heat Budget during the Last Glacial Period, Paleoceanography, 22, 
   PA1205, doi:10.1029/2006PA001338.

   Sowers, Todd, M. Bender, D. Raynaud, and Y. S. Korotkevich. 1992. δ15N of N2 
   in Air Trapped in Polar Ice: A Tracer of Gas Transport in the Firn and a 
   Possible Constraint on Ice Age-gas Age Differences. J. Geophys. Res., 97, 
   15,683-15,697, doi:10.1029/92JD01297.

   Stauffer, B. 2006. CO2 Studies. Encyclopedia of Quaternary Science, vol. 2, 
   edited by S. A. Elias, pp. 1181-1189, Elsevier, Amsterdam.

End_Group
Group: Summary

   During the last glacial period atmospheric carbon dioxide and temperature in 
   Antarctica varied in a similar fashion on millennial time scales, but previous 
   work indicates that these changes were gradual. In a detailed analysis of one 
   event, we now find that approximately half of the CO2 increase that occurred 
   during the 1500 year cold period between Dansgaard-Oeschger (DO) Events 8 and 
   9 happened rapidly, over less than two centuries. This rise in CO2 was 
   synchronous with, or slightly later than, a rapid increase of Antarctic 
   temperature inferred from stable isotopes.

End_Group
Metadata_Name: CEOS IDN DIF
Metadata_Version: 9.7
DIF_Creation_Date: 2013-08-08
Last_DIF_Revision_Date: 2013-08-08
DIF_Revision_History: New data set.