<DIF xmlns="http://gcmd.gsfc.nasa.gov/Aboutus/xml/dif/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://gcmd.gsfc.nasa.gov/Aboutus/xml/dif/ http://gcmd.gsfc.nasa.gov/Aboutus/xml/dif/dif_v9.8.4.xsd">
  <Entry_ID>noaa-icecore-17805</Entry_ID>
  <Entry_Title>GISP2 Ice Core 110,000 Year Ions Data</Entry_Title>
  <Data_Set_Citation>
    <Dataset_Creator>Mayewski, P.A.; Meeker, L.D.; Twickler, M.S.; Whitlow, S.I.; Yang, Q.; Lyons, W.B.; Prentice, M.</Dataset_Creator>
    <Dataset_Title>GISP2 Ice Core 110,000 Year Ions Data</Dataset_Title>
    <Dataset_Release_Date>1997-11-30</Dataset_Release_Date>
    <Dataset_Publisher>NCDC-Paleoclimatology</Dataset_Publisher>
    <Data_Presentation_Form>ONLINE Files</Data_Presentation_Form>
    <Dataset_DOI>Pending</Dataset_DOI>
    <Online_Resource>https://www.ncdc.noaa.gov/paleo/study/17805</Online_Resource>
  </Data_Set_Citation>
  <Personnel>
    <Role>Investigator</Role>
    <First_Name>P.A.</First_Name>
    <Last_Name>Mayewski</Last_Name>
  </Personnel>
  <Personnel>
    <Role>Investigator</Role>
    <First_Name>L.D.</First_Name>
    <Last_Name>Meeker</Last_Name>
  </Personnel>
  <Personnel>
    <Role>Investigator</Role>
    <First_Name>M.S.</First_Name>
    <Last_Name>Twickler</Last_Name>
  </Personnel>
  <Personnel>
    <Role>Investigator</Role>
    <First_Name>S.I.</First_Name>
    <Last_Name>Whitlow</Last_Name>
  </Personnel>
  <Personnel>
    <Role>Investigator</Role>
    <First_Name>Q.</First_Name>
    <Last_Name>Yang</Last_Name>
  </Personnel>
  <Personnel>
    <Role>Investigator</Role>
    <First_Name>W.B.</First_Name>
    <Last_Name>Lyons</Last_Name>
  </Personnel>
  <Personnel>
    <Role>Investigator</Role>
    <First_Name>M.</First_Name>
    <Last_Name>Prentice</Last_Name>
  </Personnel>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>ice cores</Term>
    <Detailed_Variable>depth at sample start,null,null,meter,null,ice cores,null,null,N,null</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>ice cores</Term>
    <Detailed_Variable>ammonium,bulk ice,null,parts per billion,null,ice cores,null,null,N,null</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>ice cores</Term>
    <Detailed_Variable>calcium,bulk ice,null,parts per billion,null,ice cores,null,null,N,null</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>ice cores</Term>
    <Detailed_Variable>sulfate,bulk ice,null,parts per billion,null,ice cores,null,null,N,null</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>ice cores</Term>
    <Detailed_Variable>sodium,bulk ice,null,parts per billion,null,ice cores,null,null,N,null</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>ice cores</Term>
    <Detailed_Variable>magnesium,bulk ice,null,parts per billion,null,ice cores,null,null,N,null</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>ice cores</Term>
    <Detailed_Variable>depth at sample end,null,null,meter,null,ice cores,null,null,N,null</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>ice cores</Term>
    <Detailed_Variable>chloride,bulk ice,null,parts per billion,null,ice cores,null,null,N,null</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>ice cores</Term>
    <Detailed_Variable>nitrate,bulk ice,null,parts per billion,null,ice cores,null,null,N,null</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>ice cores</Term>
    <Detailed_Variable>ice age at sample end,null,null,calendar year before present,null,ice cores,null,null,N,null</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>ice cores</Term>
    <Detailed_Variable>potassium,bulk ice,null,parts per billion,null,ice cores,null,null,N,null</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>ice cores</Term>
    <Detailed_Variable>hydrogen peroxide,bulk ice,null,parts per billion,null,ice cores,null,null,N,null</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>ice core</Term>
    <Variable_Level_1>chemistry</Variable_Level_1>
  </Parameters>
  <ISO_Topic_Category>geoscientificInformation</ISO_Topic_Category>
  <Paleo_Temporal_Coverage>
    <Paleo_Start_Date>110977 cal yr BP</Paleo_Start_Date>
    <Paleo_Stop_Date>-34 cal yr BP</Paleo_Stop_Date>
  </Paleo_Temporal_Coverage>
  <Data_Set_Progress>Complete</Data_Set_Progress>
  <Spatial_Coverage>
    <Southernmost_Latitude>72.6</Southernmost_Latitude>
    <Northernmost_Latitude>72.6</Northernmost_Latitude>
    <Westernmost_Longitude>-38.5</Westernmost_Longitude>
    <Easternmost_Longitude>-38.5</Easternmost_Longitude>
    <Minimum_Altitude>3200</Minimum_Altitude>
    <Maximum_Altitude>3200</Maximum_Altitude>
  </Spatial_Coverage>
  <Location>
    <Location_Category>Continent</Location_Category>
    <Location_Type>North America</Location_Type>
    <Location_Subregion1>Greenland</Location_Subregion1>
    <Detailed_Location>GISP2&gt;LATITUDE 72.6&gt;LONGITUDE -38.5</Detailed_Location>
  </Location>
  <Access_Constraints>None</Access_Constraints>
  <Use_Constraints>Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site.</Use_Constraints>
  <Data_Set_Language>English</Data_Set_Language>
  <Data_Center>
    <Data_Center_Name>
      <Short_Name>DOC/NOAA/NESDIS/NCEI</Short_Name>
      <Long_Name>National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce </Long_Name>
    </Data_Center_Name>
    <Data_Center_URL>https://www.ncdc.noaa.gov/data-access/paleoclimatology-data</Data_Center_URL>
    <Personnel>
      <Role>DATA Center Contact</Role>
      <First_Name>Bruce</First_Name>
      <Last_Name>Bauer</Last_Name>
      <Email>bruce.a.bauer@noaa.gov</Email>
      <Email>paleo@noaa.gov</Email>
      <Phone>303-497-6280</Phone>
      <Fax>303-497-6513</Fax>
      <Contact_Address>
        <Address>325 Broadway, E/NE31</Address>
        <City>Boulder</City>
        <Province_or_State>CO</Province_or_State>
        <Postal_Code>80305-3328</Postal_Code>
        <Country>USA</Country>
      </Contact_Address>
    </Personnel>
  </Data_Center>
  <Distribution>
    <Distribution_Media>online</Distribution_Media>
    <Distribution_Format>ASCII</Distribution_Format>
  </Distribution>
  <Reference>
    <Author>Paul A. Mayewski, Loren D. Meeker, Mark S. Twickler, Sallie Whitlow, Qinzhao Yang, W. Berry Lyons, Michael Prentice</Author>
    <Publication_Date>1997</Publication_Date>
    <Title>Major features and forcing of high-latitude northern hemisphere atmospheric circulation using a 110,000-year-long glaciochemical series</Title>
    <Series>Journal of Geophysical Research: Oceans</Series>
    <Volume>102</Volume>
    <Issue>C12</Issue>
    <Pages>26345-26366</Pages>
    <DOI>10.1029/96JC03365</DOI>
    <Online_Resource>http://onlinelibrary.wiley.com/enhanced/doi/10.1029/96JC03365/</Online_Resource>
  </Reference>
  <Summary>
    <Abstract>The Greenland Ice Sheet Project 2 glaciochemical series (sodium, potassium, ammonium, calcium, magnesium, sulfate, nitrate, and chloride) provides a unique view of the chemistry of the atmosphere and the history of atmospheric circulation over both the high latitudes and mid-low latitudes of the northern hemisphere. Interpretation of this record reveals a diverse array of environmental signatures that include the documentation of anthropogenically derived pollutants, volcanic and biomass burning events, storminess over marine surfaces, continental aridity and biogenic source strength plus information related to the controls on both high- and low-frequency climate events of the last 110,000 years. Climate forcings investigated include changes in insolation of the order of the major orbital cycles that control the long-term behavior of atmospheric circulation patterns through changes in ice volume (sea level), events such as the Heinrich events (massive discharges of icebergs first identified in the marine record) that are found to operate on a 6100-year cycle due largely to the lagged response of ice sheets to changes in insolation and consequent glacier dynamics, and rapid climate change events (massive reorganizations of atmospheric circulation) that are demonstrated to operate on 1450-year cycles. Changes in insolation and associated positive feedbacks related to ice sheets may assist in explaining favorable time periods and controls on the amplitude of massive rapid climate change events. Explanation for the exact timing and global synchroneity of these events is, however, more complicated. Preliminary evidence points to possible solar variability-climate associations for these events and perhaps others that are embedded in our ice-core-derived atmospheric circulation records. 
          STUDY NOTES: Ion data set produced by the Glacier Research Group for the GISP2 B and D cores.</Abstract>
  </Summary>
  <Related_URL>
    <URL_Content_Type>
      <Type>GET DATA</Type>
    </URL_Content_Type>
    <URL>https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/gisp2/chem/iond.txt</URL>
    <Description>Data File; GISP2 Ions Deep (D) Core</Description>
  </Related_URL>
  <Related_URL>
    <URL_Content_Type>
      <Type>GET DATA</Type>
    </URL_Content_Type>
    <URL>https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/gisp2/chem/detionb.txt</URL>
    <Description>Data File; GISP2 Ions B core (0-200 meters) Detailed</Description>
  </Related_URL>
  <Related_URL>
    <URL_Content_Type>
      <Type>GET DATA</Type>
    </URL_Content_Type>
    <URL>https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/gisp2/chem/detiond.txt</URL>
    <Description>Data File; GISP2 Ions Deep (D) Core Detailed</Description>
  </Related_URL>
  <Related_URL>
    <URL_Content_Type>
      <Type>GET DATA</Type>
    </URL_Content_Type>
    <URL>https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/gisp2/chem/ionb.txt</URL>
    <Description>Data File; GISP2 Ions B core (0-200 meters)</Description>
  </Related_URL>
  <IDN_Node>
    <Short_Name>USA/NOAA</Short_Name>
  </IDN_Node>
  <Metadata_Name>DIF</Metadata_Name>
  <Metadata_Version>Version 9.8.4</Metadata_Version>
  <DIF_Creation_Date>2018-12-11</DIF_Creation_Date>
  <Last_DIF_Revision_Date>2018-12-11</Last_DIF_Revision_Date>
</DIF>