<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-ocean-14609</Entry_ID>
  <Entry_Title>North Icelandic Shelf Arctica islandica Shell Measurement 1357 Year Record</Entry_Title>
  <Data_Set_Citation>
    <Dataset_Creator>Butler, P.G.; Wanamaker, A.D.; Scourse, J.D.; Richardson, C.A.; Reynolds, D.J.</Dataset_Creator>
    <Dataset_Title>North Icelandic Shelf Arctica islandica Shell Measurement 1357 Year Record</Dataset_Title>
    <Dataset_Release_Date>2013-06-24</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/14609</Online_Resource>
  </Data_Set_Citation>
  <Personnel>
    <Role>Investigator</Role>
    <First_Name>P.G.</First_Name>
    <Last_Name>Butler</Last_Name>
  </Personnel>
  <Personnel>
    <Role>Investigator</Role>
    <First_Name>A.D.</First_Name>
    <Last_Name>Wanamaker</Last_Name>
  </Personnel>
  <Personnel>
    <Role>Investigator</Role>
    <First_Name>J.D.</First_Name>
    <Last_Name>Scourse</Last_Name>
  </Personnel>
  <Personnel>
    <Role>Investigator</Role>
    <First_Name>C.A.</First_Name>
    <Last_Name>Richardson</Last_Name>
  </Personnel>
  <Personnel>
    <Role>Investigator</Role>
    <First_Name>D.J.</First_Name>
    <Last_Name>Reynolds</Last_Name>
  </Personnel>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>paleoceanography</Term>
    <Detailed_Variable>growth rate,null,average correlation coefficient,dimensionless,null,paleoceanography,null,null,N,standard deviation of Rbar</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>paleoceanography</Term>
    <Detailed_Variable>number of samples,null,null,count,null,paleoceanography,null,null,N,number of Arctica Islandica time series used in EPS calculation</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>paleoceanography</Term>
    <Detailed_Variable>growth rate,bivalve,null,micrometer,null,paleoceanography,averaged,null,N,Arctica islandica hinge plate region</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>paleoceanography</Term>
    <Detailed_Variable>number of samples,null,null,count,null,paleoceanography,null,null,N,null</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>paleoceanography</Term>
    <Detailed_Variable>growth rate,bivalve,null,year,null,paleoceanography,averaged,null,N,Arctica islandica</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>paleoceanography</Term>
    <Detailed_Variable>growth rate,bivalve,null,micrometer,null,paleoceanography,averaged,null,N,Arctica islandica outer shell margin</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>paleoceanography</Term>
    <Detailed_Variable>age,bivalve,null,year,null,paleoceanography,averaged,null,N,Arctica islandica sample age</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>paleoceanography</Term>
    <Detailed_Variable>age,bivalve,null,year,null,paleoceanography,null,null,N,Arctica islandica lifetime</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>paleoceanography</Term>
    <Detailed_Variable>age,null,null,year,null,paleoceanography,null,null,N,biological age</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>paleoceanography</Term>
    <Detailed_Variable>growth rate,bivalve,null,micrometer,null,paleoceanography,smoothed,null,N,Arctica islandica hinge plate region; smoothed with 88-year spline</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>paleoceanography</Term>
    <Detailed_Variable>age,bivalve,null,year Common Era,null,paleoceanography,null,null,N,Arctica islandica first year</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>paleoceanography</Term>
    <Detailed_Variable>growth rate,null,average correlation coefficient,dimensionless,null,paleoceanography,null,null,N,mean of all correlations between pairs of increment-width series of Arctica islandica</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>paleoceanography</Term>
    <Detailed_Variable>growth rate,null,expressed population signal,dimensionless,null,paleoceanography,null,null,N,null</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>paleoceanography</Term>
    <Detailed_Variable>growth rate,bivalve,null,micrometer,null,paleoceanography,null,null,N,Arctica islandica unspecified measurement</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>paleoceanography</Term>
    <Detailed_Variable>growth rate,bivalve,null,micrometer,null,paleoceanography,smoothed,null,N,Arctica islandica outer shell margin; smoothed with 88-year spline</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>paleoceanography</Term>
    <Detailed_Variable>organic carbon,bivalve,null,dimensionless,null,paleoceanography,detrended|normalized,null,N,Arctica islandica; regional curve standardization; autoregressively modelled version from ARSTAN</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>paleoceanography</Term>
    <Detailed_Variable>age,null,null,year Common Era,null,paleoceanography,null,null,N,null</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>paleoceanography</Term>
    <Detailed_Variable>number of samples,null,null,count,null,paleoceanography,null,null,N,number of correlations used in Rbar calculation</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>paleoceanography</Term>
    <Detailed_Variable>growth rate,null,average correlation coefficient,dimensionless,null,paleoceanography,null,null,N,one standard error of Rbar</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>paleoceanography</Term>
    <Detailed_Variable>organic carbon,bivalve,null,dimensionless,null,paleoceanography,detrended,null,N,Arctica islandica; negative exponential function; autoregressively modelled version from ARSTAN</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>paleoceanography</Term>
    <Detailed_Variable>sample identification,null,null,null,null,paleoceanography,null,null,N,shell number</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>paleoceanography</Term>
    <Detailed_Variable>age,bivalve,null,year Common Era,null,paleoceanography,null,null,N,Arctica islandica last year</Detailed_Variable>
  </Parameters>
  <Parameters>
    <Category>earth science</Category>
    <Topic>paleoclimate</Topic>
    <Term>paleocean</Term>
    <Variable_Level_1>reconstruction</Variable_Level_1>
  </Parameters>
  <ISO_Topic_Category>geoscientificInformation</ISO_Topic_Category>
  <Keyword>Meridional Overturning Circulation (MOC)</Keyword>
  <Paleo_Temporal_Coverage>
    <Paleo_Start_Date>649 AD</Paleo_Start_Date>
    <Paleo_Stop_Date>2005 AD</Paleo_Stop_Date>
  </Paleo_Temporal_Coverage>
  <Paleo_Temporal_Coverage>
    <Paleo_Start_Date>1301 cal yr BP</Paleo_Start_Date>
    <Paleo_Stop_Date>-55 cal yr BP</Paleo_Stop_Date>
  </Paleo_Temporal_Coverage>
  <Data_Set_Progress>Complete</Data_Set_Progress>
  <Spatial_Coverage>
    <Southernmost_Latitude>66.5265</Southernmost_Latitude>
    <Northernmost_Latitude>66.5265</Northernmost_Latitude>
    <Westernmost_Longitude>-18.1957</Westernmost_Longitude>
    <Easternmost_Longitude>-18.1957</Easternmost_Longitude>
    <Minimum_Altitude>-82</Minimum_Altitude>
    <Maximum_Altitude>-82</Maximum_Altitude>
  </Spatial_Coverage>
  <Location>
    <Location_Category>Ocean</Location_Category>
    <Location_Type>Atlantic Ocean</Location_Type>
    <Location_Subregion1>North Atlantic Ocean</Location_Subregion1>
    <Detailed_Location>Trawl B05AD03&gt;LATITUDE 66.5265&gt;LONGITUDE -18.1957</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>Butler, P.G., A.D. Wanamaker Jr., J.D. Scourse, C.A. Richardson and D.J. Reynolds. 2013. Variability of marine climate on the North Icelandic Shelf in a 1357-year proxy archive based on growth increments in the bivalve Arctica islandica. Palaeogeography, Palaeoclimatology, Palaeoecology, 373, 141-151. DOI: 10.1016/j.palaeo.2012.01.016</Reference>
  <Reference>Wanamaker, A.D., P.G. Butler, J.D. Scourse, J. Heinemeier, 
J. Eiríksson, K.L. Knudsen, and C.A. Richardson. 2012. 
Surface changes in the North Atlantic meridional overturning 
circulation during the last millennium. 
Nature Communications, Published 12 Jun 2012. 
DOI: 10.1038/ncomms1901</Reference>
  <Summary>
    <Abstract>Despite numerous investigations, the dynamical origins of the Medieval 
Climate Anomaly and the Little Ice Age remain uncertain. A major 
unresolved issue relating to internal climate dynamics is the mode 
and tempo of Atlantic meridional overturning circulation variability, 
and the significance of decadal-to-centennial scale changes in Atlantic 
meridional overturning circulation strength in regulating the climate 
of the last millennium. Here we use the time-constrained high-resolution 
local radiocarbon reservoir age offset derived from an absolutely dated 
annually resolved shell chronology spanning the past 1,350 years, 
to reconstruct changes in surface ocean circulation and climate. 
The water mass tracer data presented here from the North Icelandic 
shelf, combined with previously published data from the Arctic 
and subtropical Atlantic, show that surface Atlantic meridional 
overturning circulation dynamics likely amplified the relatively warm 
conditions during the Medieval Climate Anomaly and the relatively cool 
conditions during the Little Ice Age within the North Atlantic sector. 

 
          STUDY NOTES: Raw measurements of increment widths from shells of the bivalve Arctica islandica; absolute dates of birth and death derived by crossdating; chronologies derived from a mean value function of the detrended increment widths, and supplementary data associated with the chronologies and presented in the paper.
Keyword: Sclerochronology</Abstract>
  </Summary>
  <Related_URL>
    <URL_Content_Type>
      <Type>GET DATA</Type>
    </URL_Content_Type>
    <URL>https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/butler2013/butler2013-chron.txt</URL>
  </Related_URL>
  <Related_URL>
    <URL_Content_Type>
      <Type>GET DATA</Type>
    </URL_Content_Type>
    <URL>https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/butler2013/butler2013-lifetimes.txt</URL>
  </Related_URL>
  <Related_URL>
    <URL_Content_Type>
      <Type>GET DATA</Type>
    </URL_Content_Type>
    <URL>https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/butler2013/butler2013-raw.txt</URL>
  </Related_URL>
  <Related_URL>
    <URL_Content_Type>
      <Type>GET DATA</Type>
    </URL_Content_Type>
    <URL>https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/butler2013/butler2013-stats-ne.txt</URL>
  </Related_URL>
  <Related_URL>
    <URL_Content_Type>
      <Type>GET DATA</Type>
    </URL_Content_Type>
    <URL>https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/butler2013/butler2013-seg-length.txt</URL>
  </Related_URL>
  <Related_URL>
    <URL_Content_Type>
      <Type>GET DATA</Type>
    </URL_Content_Type>
    <URL>https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/butler2013/butler2013-rcs.txt</URL>
  </Related_URL>
  <Related_URL>
    <URL_Content_Type>
      <Type>GET DATA</Type>
    </URL_Content_Type>
    <URL>https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/butler2013/butler2013-stats-rcs-h.txt</URL>
  </Related_URL>
  <Related_URL>
    <URL_Content_Type>
      <Type>GET DATA</Type>
    </URL_Content_Type>
    <URL>https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/butler2013/butler2013-stats-rcs-m.txt</URL>
  </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>2019-02-21</DIF_Creation_Date>
  <Last_DIF_Revision_Date>2019-02-21</Last_DIF_Revision_Date>
</DIF>
