Known Issues With LinkedEarth Representation of the PAGES2k Dataset

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This page lists the issue identified with the representation of the PAGES2k dataset in LinkedEarth.

Ghost measured variables

Because the LinkedEarth Ontology requires the representation of the archive type to be made on a measured variable, it was decided to create "ghost" measured variable if only the inferred variables were archived. The following datastes have improperly set the inferred variable to a measured variable with a Property:ProxyObservationType (L) set to "Ghostmeasured".

Instead, these datasets should have an additional entry in the JSON-LD file with the proper Property:ProxyObservationType (L).

 
Afr-P178-15P.Tierney.2015.paleo3measurement1
Ant-DSS.DahlJensen.1999.paleo1measurement1
Ant-WAIS-Divide.Severinghaus.2012.paleo1measurement1
Arc-BigRoundLake.Thomas.2009.paleo1measurement1
Arc-GulfofAlaska.Wilson.2014.paleo1measurement1
Arc-HudsonLake.Clegg.2011.paleo1measurement1
Arc-Iceland.Bergthorsson.1969.paleo1measurement1
Arc-LakeE.DAndrea.2011.paleo1measurement1
Arc-MD992275.Jiang.2005.paleo1measurement1
Arc-StoreggaSlide.Sejrup.2011.paleo1measurement1
... further results

Earliest Sample Date/Latest Sample Date

The period covered by the record should be provided at the variable level through the HasMinValue and HasMaxValue properties.

EarliestSampleDate

 
Afr-ColdAirCave.Sundqvist.2013
Afr-LakeMalawi.Powers.2011
Afr-LakeTanganyika.Tierney.2010
Afr-P178-15P.Tierney.2015
Ant-BerknerIsland.Mulvaney.2002
Ant-CoastalDML.Thamban.2012
Ant-DSS.DahlJensen.1999
Ant-DSS.Moy.2012
Ant-DomeC.Jouzel.2001
Ant-DomeC.Stenni.2001
... further results


LastestSampleDate

 
Afr-ColdAirCave.Sundqvist.2013
Afr-LakeMalawi.Powers.2011
Afr-LakeTanganyika.Tierney.2010
Afr-P178-15P.Tierney.2015
Ant-BerknerIsland.Mulvaney.2002
Ant-CoastalDML.Thamban.2012
Ant-DSS.DahlJensen.1999
Ant-DSS.Moy.2012
Ant-DomeC.Jouzel.2001
Ant-DomeC.Stenni.2001
... further results

Calibration models on measured Variable

The newest version of the LinkedEarth Ontology should only allow the calibration model to be attached to an inferred variable through the property calibratedVia. Some PAGES2k datasets have information relating to calibration on the measured variable.

 
Africa 001.d18O
Arc 001.thickness
Aus 015.trsgi
Aus 020.trsgi
PYT0KEXC0XJ.ghostMeasured
PYT10B6Y9V4.ghostMeasured
PYT1J4LM3YU.ghostMeasured
PYT22RKLEGF.ghostMeasured
PYT2J0FBLWB.ghostMeasured
PYT2SGXNF4F.ghostMeasured
... further results

Improper naming of ProxyObservationType

Some types have a number after them probably lifted from the name. Should be removed. This inlude:

  • d18O1
  • calcification 1,2,3,4,5,6,7
  • count (1 thru 18)
  • trsgi (1 thru 4)
  • temperature (1 thru 3)

In addition, uncertainty_temperature and notes should not be types of proxy observations.

Improper formating for trace element names

The LinkedEarth Ontology uses the proper "/" for trace elements rather than a space as used by PAGES 2k, therefore "Mg Ca" should be "Mg/Ca".

Mg/Ca

 
Ocn-CH07-98-MC-22.Saenger.2011.paleo1measurement1
Ocn-CH07-98-MC-22.Saenger.2011.paleo2measurement1
Ocn-CariacoBasin.Black.2007.paleo1measurement1
Ocn-CariacoBasin.Black.2007.paleo2measurement1
Ocn-CariacoBasin.Lea.2003.paleo1measurement1
Ocn-DryTortugas.Lund.2006.paleo1measurement1
Ocn-DryTortugas.Lund.2006.paleo2measurement1
Ocn-EasternTropicalNorthAtlantic.Kuhnert.2011.paleo1measurement1
Ocn-EasternTropicalNorthAtlantic.Kuhnert.2011.paleo2measurement1
Ocn-FiskBasin.Richey.2009.paleo1measurement1
... further results


Sr/Ca

 
Ocn-AmedeeIsland.DeLong.2012.paleo1measurement1
Ocn-BermudaSouthShore.Goodkin.2008.paleo1measurement1
Ocn-Clipperton1b.Wu.2014.paleo1measurement1
Ocn-Clipperton2b.Wu.2014.paleo1measurement1
Ocn-Clipperton4b.Wu.2014.paleo1measurement1
Ocn-Clipperton6a.Wu.2014.paleo1measurement1
Ocn-CoralSea.Calvo.2007.paleo1measurement1
Ocn-DryTortugas.DeLong.2014.paleo1measurement1
Ocn-GBR.Wei.2009.paleo1measurement1
Ocn-GreatBarrierReef.Hendy.2002.paleo1measurement1
... further results


C/N

 
Aus-DuckholeLake.Saunders.2013.paleo1measurement1

SensorSpecies placed under the variable category

In the LinkedEarth Ontology, the proper path is Category:MeasuredVariable (L) -> Property:HasProxySystem (L) -> Category:ProxySystem (L) -> Property: ProxySensorType (L) -> Category:ProxySensor (L) -> Property:SensorSpecies (L).

Note: This may be a problem with the mapping rather than the PAGES2k LiPD files.

 
BJ8-13GGC.Linsley.2010.chron1measurement1
BJ8-70GGC.Linsley.2010.chron1measurement1
NAm-AlmondButterLower.DArrigo.2005.paleo1measurement1
NAm-AlmondButterUpper.DArrigo.2005.paleo1measurement1
NAm-Arapahoe.Kienast.1996.paleo1measurement1
NAm-Arapahoe.Kienast.1996.paleo2measurement1
NAm-ArrowsmithMountain.Briffa.1996.paleo1measurement1
NAm-ArrowsmithMountain.Briffa.1996.paleo2measurement1
NAm-Athabasca.Schweingruber.1996.paleo1measurement1
NAm-Athabasca.Schweingruber.1996.paleo2measurement1
... further results

Physical Sample

For most datasets, the name of the physical sample doesn't correspond to anything. In some instances, it's just an fancier name for the timeseries. Should be removed.

LiPD version mixture

Some files have shown to have an invalid mixture of LiPD v1.2 and v.1.3 structures. The known issue so far is ensemble tables are an incorrect data type. In v1.2, ensemble tables are a fixed single entry for one table. In v1.3, ensemble tables are an array of multiple possible entries for multiple tables. Files downloaded from the Wiki have ensemble arrays as per v1.3, but have other characteristics of v1.2 like "chronModel", "chronMesurementTable", "chronDataTableName" and other discontinued keys.


Arc-Agassiz.Vinther.2008