Search results for "dated standard deviation"

showing 3 items of 3 documents

(Table 1) Age determination of sediment profile SO90-41KL/63KA

2002

The 14C ages of planktonic foraminifers Globigerinoides sacculifer bracketing the Younger Dryas in a d18O record of Globigerinoides ruber from a laminated sediment core on the Pakistani continental margin suggest that surface reservoir ages in the Arabian Sea were in excess of 1000 years during the deglaciation. A least squares error fit of a detailed 14C chronology to the (atmospheric) tree ring record gave variable early Holocene reservoir ages between 780 and 1120 years, well above the prebomb value of 640 years. Mid-Holocene reservoir ages are less well constrained but were probably closer to the prebomb value. The method used to fit individual core sections to the tree ring record was …

SO90SectionCalendar ageReservoir age standard errorAge 14C calibratedDEPTH sediment/rockAge commentAge dated materialAge datedSonneAge dated standard deviationReservoir ageAge 14C AMSComposite Core
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(Table 2) Age determination of sediment core NIOP-C2_929

2007

In this study we present a sea surface temperature (SST) record from the western Arabian Sea for the last 20,000 years. We produced centennial-scale d18O and Mg/Ca SST time series of core NIOP929 with focus on the glacial-interglacial transition. The western Arabian Sea is influenced by the seasonal NE and SW monsoon wind systems. Lowest SSTs occur during the SW monsoon season because of upwelling of cold water, and highest SSTs can be found in the low-productivity intermonsoon season. The Mg/Ca-based temperature record reflects the integrated SST of the SW and NE monsoon seasons. The results show a glacial-interglacial SST difference of ~2°C, which is corroborated by findings from other Ar…

Sample amountCalendar ageDepth top/minDEPTH sediment/rockAge 14C calibrated CALIB (Stuiver & Reimer 1993)Age commentAge datedAge dated materialSize fractionTyroAge 14C calibrated CALIB (Stuiver & Reimer 1993)Age dated standard deviationDepth bottom/maxCoreAge 14C AMSNIOP-C2
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(Supplementary Table 1) 230Th/U results for stalagmite Cuba Grande (CG) from Pinar del Rio

2010

We present 22 U-series ages for a stalagmite from north-western Cuba based on multi-collector inductively coupled plasma mass spectrometry (MC-ICPMS) and thermal ionisation mass spectrometry (TIMS). Our results reveal that the stalagmite continuously grew within the last ~1400a. Low uranium content of the sample and thus, extremely low 230Th concentrations limit the precision and accuracy of 230Th/U-dating by TIMS. Samples measured by MC-ICPMS show a high variability of 232Th content along the growth axis with some sections significantly affected by initial 230Th from a detrital phase. An a-priori bulk earth ratio for (238U/232Th) cannot be used to accurately account for this initial 230Th.…

Thorium 230 Uranium 238 ratioUranium-234 standard deviationIntegrierte Analyse zwischeneiszeitlicher Klimadynamik INTERDYNAMIKUranium 238Thorium 230 Uranium 238 activity ratioUranium-238Thorium-230/Uranium-238 activity ratio standard deviationAge commentUranium 234Integrierte Analyse zwischeneiszeitlicher Klimadynamik (INTERDYNAMIK)commentAge dateddateddated standard deviationAgeAge dated standard deviationThorium-232 standard deviationThorium-230/Uranium-238 ratioMulti collector inductively coupled plasma mass spectrometer MC ICP MSThorium-230/Thorium-232 activity ratioThorium 232Uranium-238 standard deviationSpeleothem sampleThorium 230 Thorium 232 activity ratioUranium-234/Uranium-238 activity ratioUranium 234 Uranium 238 activity ratioThorium-232DISTANCEEarth System ResearchMulti-collector inductively coupled plasma mass spectrometer (MC-ICP-MS)standard deviationThorium-230/Thorium-232 activity ratio standard deviation
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