@prefix datacite: <http://purl.org/spar/datacite/> .
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix dwc: <http://rs.tdwg.org/dwc/terms/> .
@prefix gcis: <http://data.globalchange.gov/gcis.owl#> .
@prefix cito: <http://purl.org/spar/cito/> .
@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix prov: <http://www.w3.org/ns/prov#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix biro: <http://purl.org/spar/biro/> .

<http://52.38.26.42:8080/dataset/nsidc-0311>
   datacite:identifier "nsidc-0311";
   dcterms:title "Trapped Gas Composition and Chronology of the Vostok Ice Core"^^xsd:string;
   datacite:doi "10.7265/N5P26W12";
   datacite:hasIdentifier [ a datacite:AlternateResourceIdentifier; rdf:value "NSIDC-0311" ] ;
   dcat:landingPage <http://nsidc.org/data/NSIDC-0311>;
   dcterms:description "This data set includes a time scale for the Vostok ice core, retrieved from Vostok Station on the East Antarctic Plateau. This chronology is derived by orbitally tuning to molecular oxygen to nitrogen (O<sub>2</sub>/N<sub>2</sub>) ratios in occluded air for depths deeper than 1550 m (greater than 112,000 years old), and by gas correlation to the Greenland Ice Sheet Project 2 (GISP2) chronology for the ice core section that is shallower than 1422 m (less than 102,000 years old). Because of poor gas preservation in air bubbles in shallower depths, investigators could only constrain the Vostok chronology for the section deeper than 1550 m by O<sub>2</sub>/N<sub>2</sub>. Thus for the shallower section of the core, they synchronized the Vostok delta oxygen-18 (&delta;O) and methane (CH<sub>4</sub>) measurements to those of the GISP2 to obtain the chronology (see Bender, et al. 2006). Note, CH<sub>4</sub> data are not included in this data set. Investigators analyzed the O<sub>2</sub>/N<sub>2</sub> and the<em><strong> </strong></em>&delta;O record ratios for approximately the past 115,000 to 400,000 years in the Vostok ice core. They combined new measurements for O<sub>2</sub>/N<sub>2</sub> and &delta;O with data from Bender (2002) and Petit, et al. (1999), respectively. Data are in Microsoft Excel format and are available via FTP."^^xsd:string;
 
## Dates of dataset release and access
   dcterms:issued "2007-07-10T00:00:00"^^xsd:dateTime;

## Spatial and temporal information:
dcterms:spatial [
    a dcterms:Location, gcis:SpatialExtent;
    gcis:northBoundLatitude "-72.4667"^^xsd:float;
    gcis:southBoundLatitude "-72.4667"^^xsd:float;
    gcis:eastBoundLongitude "-106.8"^^xsd:float;
    gcis:westBoundLongitude "-106.8"^^xsd:float;
  ] ;
dcterms:temporal [
    a dcterms:PeriodOfTime, gcis:TemporalExtent;
    gcis:startDate "2003-09-01T00:00:00"^^xsd:dateTime;
    gcis:endDate "2006-06-30T00:00:00"^^xsd:dateTime;
    ] ;

## Attributes and keywords

## Instrument Instances

   a gcis:Dataset .




## This entity was produced by an organization:     
<http://52.38.26.42:8080/dataset/nsidc-0311>    
   prov:qualifiedAttribution [
      a prov:Attribution;
      prov:agent <http://52.38.26.42:8080/organization/national-snow-ice-data-center>;
      prov:hadRole <http://52.38.26.42:8080/role_type/data_archive>;
      ] .


## Also known as:
<http://52.38.26.42:8080/dataset/nsidc-0311>
   skos:altLabel "oai:nsidc/NSIDC-0311";
   gcis:hasURL "http://nsidc.org/api/dataset/2/oai?verb=GetRecord&metadataPrefix=dif&identifier=oai:nsidc/NSIDC-0311";
   skos:exactMatch <http://52.38.26.42:8080/lexicon/nsidc/dataset/oai:nsidc/NSIDC-0311> .