{ "paleoData": [ { "measurementTable": [ { "googleWorkSheetKey": "ox8l8mv", "tableName": "paleo1measurement1", "missingValue": "nan", "d2H": { "datum": "NA", "description": "aquatic biomarker", "hasChron": "1", "hasMax": -214.5, "hasMaxValue": -214.5, "hasMean": -253.2976, "hasMeanValue": -253.2976, "hasMedian": -255.6, "hasMedianValue": -255.6, "hasMin": -285.7, "hasMinValue": -285.7, "hasPaleoDepth": "0", "inferredMaterial": "lake water", "inferredMaterialGroup": "surface water", "inferredMaterialGroupOriginal": "lake water", "instrument": "Trace GC with PTV inlet in splitless mode, 30m DB-5 capillary column (J&W Scientific) with 0.25mm i.d. and 0.25 lm film, and was operated at a constant helium flow rate of 1 ml/min. The oven temperature pro- gram differed for each lipid class. For hydrocarbons, the starting temperature was 90 °C, rising to 230 °C at 13 °C/min, then to 325 °C at 5.5 °C/min, followed by 13 min at 325 °C. Effluent from the GC entered the GC-C III interface, a graphite-lined ceramic tube at 1400 °C, where quantitative pyrolysis to graphite, hydrogen gas and carbon monoxide occurred (Bur- goyne and Hayes, 1998). The hydrogen gas stream was introduced to the Finnigan Deltaplus XP mass spectrometer via an open split, where a flow of helium carried the H2 gas into the mass spectrometer.", "iso2kCertification": "ET, AA", "iso2kPrimaryTimeseries": "TRUE", "iso2kUI": "LS14ZHJU01", "isPrimary": false, "meanValue12k": -253.2976, "measurementMaterial": "Botryococcene isomer", "measurementMaterialDetail": "C34", "measurementStandard": "VSMOW", "measurementTableMD5": "3ed95a153d9a11d49a2b6bdf784cd346", "measurementTableName": "measurementTable1", "medianRes12k": 61.45, "notes": "; archiveType changed - was originally Lake sediment (LS)", "paleoDataTableName": "pt1_1", "paleoMeasurementTableMD5": "85b9de4533378498e4a7debc4ee00729", "proxy": "dD", "proxyDetail": "dD", "proxyGeneral": "isotope", "proxyLumps": "dDwax", "QCCertification": "ET, CH", "TSid": "LS14ZHJU01A", "units": "permil", "variableName": "d2H", "variableNameOriginal": "dD", "variableType": "measured", "primaryAgeColumn": false, "hasTimeTsid": "ROLaMTjnvyS", "values": [-242.1, -239.3, -237.5, -237.3, -229.6, -233.2, -231.3, -234.8, -227, -230.7, -228.6, -223.9, -225.1, -239.3, -242.6, -258.3, -256.1, -259.7, -259.1, -271.2, -267.5, -264.2, -265.1, -268.5, -262.6, -262, -283.3, -272.6, -279.6, -268.6, -280.7, -270.3, -266.5, -277.7, -280.2, -283.6, -266.8, -254.7, -249.5, -255.6, -257, -245, -230.9, -214.5, "NaN", -262.8, "NaN", "NaN", "NaN", -245.3, -239.8, -243.4, -255.1, -254.1, -250.2, -247.5, -246.8, -250.1, -248.1, -247.9, -252.6, -256.5, -254.5, -253.4, -256.6, -258.1, -258.9, -268.8, -263.3, -261.2, -229.1, -253.1, -240.4, "NaN", -224.8, -240.6, -228.2, "NaN", "NaN", -285.7, -264.5, -263.8, -285.7, -262.8, -222.9, -240.3, -262.4, -265.9, "NaN", "NaN", "NaN", -260.1, -259.4, -272.6, -259.3], "mostRecentCompilations": null, "primaryTimeseries": null, "QCnotes": null, "interpretation": [ { "basis": "“El Junco Lake Atwood and Sachs (2014) showed that the lake water δD was primarily controlled by rainfall rates during El Niño episodes, as opposed to evaporation or water loss through seepage or overflow….changes in rainfall amount are imprinted in the isotopic composition of botryococcenes, with negative (posi- tive) δD values co-occurring with wetter (drier) periods.”", "direction": "negative", "interpDirection": "negative", "scope": "climate", "seasonality": "Annual", "seasonalityGeneral": "Annual", "variable": "precipitation", "variableDetail": "amount@surface", "variableGroup": "P", "dynamical": null }, { "scope": "climate", "basis": null, "direction": null, "seasonality": null, "variable": null, "variableDetail": null }, { "scope": "climate", "basis": null, "direction": null, "seasonality": null, "variable": null, "variableDetail": null }, { "basis": "It is expected that dD values of botryococcene will decline when precipitation rates increase, possibly providing a metric for the severity of extreme rainfall events that are associated with El Nino events. (All botryococcene dD values were highly correlated with water dD values (R2>0.99). 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P.: El Nino evolution during the Holocene revealed by a biomarker rain gauge in the Galapagos Islands, Earth and Planetary Science Letters, 404, 420–434, doi:10.1016/j.epsl.2014.07.013, 2014.", "doi": "10.1016/j.epsl.2014.07.013", "journal": "Earth and Planetary Science Letters", "page": "420-434", "pages": "420-434", "pubDataUrl": "doi.org", "publisher": "Elsevier BV", "title": "El Nino evolution during the Holocene revealed by a biomarker rain gauge in the Galapagos Islands", "type": "article-journal", "volume": "404", "year": 2014 } ], "geo": { "longitude": -89.4833, "latitude": -0.9, "elevation": 670, "geometryType": "Point", "gcmdLocation": "South America>Ecuador", "location": "Galapagos", "siteName": "El Junco Lake" }, "@context": "context.jsonld" }