0000000000341417

AUTHOR

Claudia Fensterer

showing 5 related works from this author

230Th/U-dating of a late Holocene low uranium speleothem from Cuba

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.…

Accuracy and precisiongeographygeography.geographical_feature_categoryMineralogyThermal ionizationSpeleothemchemistry.chemical_elementStalagmiteUraniumMass spectrometrychemistryInductively coupled plasma mass spectrometryGeologyHoloceneIOP Conference Series: Earth and Environmental Science
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Cuban stalagmite suggests relationship between Caribbean precipitation and the Atlantic Multidecadal Oscillation during the past 1.3 ka

2012

Here we present the first high-resolution δ18O record of a stalagmite from western Cuba. The record reflects precipitation variability in the northwestern Caribbean during the last 1.3 ka and exhibits a correlation to the Atlantic Multidecadal Oscillation (AMO). This suggests a relationship between Caribbean rainfall intensity and North Atlantic sea-surface temperature (SST) anomalies. A potential mechanism for this relationship may be the strength of the Thermohaline Circulation (THC). For a weaker THC, lower SSTs in the North Atlantic possibly lead to a southward shift of the Intertropical Convergence Zone and drier conditions in Cuba. Thus, this Cuban stalagmite records drier conditions…

ArcheologyGlobal and Planetary Changegeographygeography.geographical_feature_categoryEcologyδ18OPaleontologyStalagmiteOceanographyAtlantic Equatorial modeNorth Atlantic oscillationClimatologyAtlantic multidecadal oscillationPrecipitationGeologyEarth-Surface ProcessesThe Holocene
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Control of Seasonality and Interannual to Centennial Climate Variability in the Caribbean During the Holocene—Combining Coral Records, Stalagmite Rec…

2014

This study aimed at quantifying the amplitudes of seasonality and interannual to centennial climate variability in the Caribbean region throughout the Holocene, by using marine (shallow-water corals) and terrestrial (speleothems) climate archives, and climate model simulations (COSMOS). Sea-surface temperature (SST) variability on interdecadal to multidecadal timescales was more pronounced during the mid-Holocene compared to the late Holocene. The amplitude of the SST annual cycle was within the present-day range throughout most of the last 6,000 years. Exceptions include slightly increased SST seasonality at 6,200 years ago, which can be attributed mainly to insolation forcing on orbital t…

geographygeography.geographical_feature_categoryStalagmiteTropical AtlanticSeasonalityAnnual cyclemedicine.diseaseOceanographyClimatologyAtlantic multidecadal oscillationPaleoclimatologymedicineClimate modelHolocene
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Millennial-scale climate variability during the last 12.5 ka recorded in a Caribbean speleothem

2013

Abstract We present a speleothem stable oxygen isotope record for the last 12.5 ka based on two stalagmites from western Cuba. The δ18O signal is interpreted to represent past precipitation variability. Both stalagmites show a pronounced transition from higher δ18O values (indicating drier conditions) to more negative δ18O values (suggesting wetter conditions) between 10 and 6 ka. This transition is also visible in a planktonic δ18O record off Haiti. On orbital timescales, the δ18O value of Caribbean precipitation, thus, strongly resembles the oxygen isotope composition of Caribbean surface water. On millenial timescales, the speleothem δ18O record shows a high correlation to a North Atlant…

geographygeography.geographical_feature_categoryδ18OIntertropical Convergence ZoneSpeleothemStalagmiteSea surface temperatureGeophysicsOceanographySpace and Planetary ScienceGeochemistry and PetrologyClimatologyEarth and Planetary Sciences (miscellaneous)PrecipitationHoloceneGeologyTeleconnectionEarth and Planetary Science Letters
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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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