Hydroclimate time-series archived in a 4300 year old stalagmite from Desoto Caverns (Alabama, USA)

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dc.contributor Andrus, C. Fred T.
dc.contributor Blitz, John Howard
dc.contributor Robinson, D. M.
dc.contributor.advisor Aharon, Paul
dc.contributor.author Aldridge, David Edward
dc.date.accessioned 2017-03-01T17:36:36Z
dc.date.available 2017-03-01T17:36:36Z
dc.date.issued 2014
dc.identifier.other u0015_0000001_0002068
dc.identifier.other Aldridge_alatus_0004M_11846
dc.identifier.uri https://ir.ua.edu/handle/123456789/2456
dc.description Electronic Thesis or Dissertation
dc.description.abstract Recently published climate studies have implicated the Atlantic Multidecadal Oscillation (AMO) as the dominant factor modulating the precipitation in the regions adjacent to the Atlantic Ocean and the Gulf of Mexico but long range, land-based paleoclimate proxies, are notably lacking. Here I report the results of a new stalagmite- derived ä18O and ä13C ( / VPDB) time series and petrographic study from DeSoto Caverns, Alabama, spanning the interval from recent to 4025 years BP. The new data document AMO as having a pervasive controlling influence on the Southeastern USA region's hydroclimate during the Late Holocene. Ten precise 230Th/234U age determinations, from an 11.3 cm section of stalagmite, spanning the interval from 1883 to 4025 years BP, were used to construct an age model for the stable isotopes time-series containing 882 determinations. Analysis of the stalagmite's ä18O time-series in the frequency domain exhibits dominant periodicities of 30.8 ± 1.4 years and 27.4 ± 0.8 years at the Chi Squared 95% confidence interval that match the instrument-derived AMO half cycle periodicity of approximately 30 years. At the Chi Squared 90% confidence interval, the stalagmite's ä18O time-series frequency analysis reveal a periodicity of 58.0 ± 2.7 years, matching the instrument derived AMO full cycle of approximately 60 years. Starting about 1883 years BP a series of anomalous black laminations appear in the stalagmite and continue, with short interruptions, until a return to normal deposition at approximately 49 years BP. Petrographic investigations reveal that the section of the stalagmite that contains the black laminations also features intense dissolutional unconformities that are predominately composed of detrital material. Both the detrital material and dissolutional unconformities, likely resulted from intense landscape modifications by the pre-Columbian Native American and European societies inhabiting the region during the time.
dc.format.extent 100 p.
dc.format.medium electronic
dc.format.mimetype application/pdf
dc.language English
dc.language.iso en_US
dc.publisher University of Alabama Libraries
dc.relation.ispartof The University of Alabama Electronic Theses and Dissertations
dc.relation.ispartof The University of Alabama Libraries Digital Collections
dc.relation.hasversion born digital
dc.rights All rights reserved by the author unless otherwise indicated.
dc.subject.other Geology
dc.subject.other Paleoclimate science
dc.subject.other Geochemistry
dc.title Hydroclimate time-series archived in a 4300 year old stalagmite from Desoto Caverns (Alabama, USA)
dc.type thesis
dc.type text
etdms.degree.department University of Alabama. Dept. of Geological Sciences
etdms.degree.discipline Geology
etdms.degree.grantor The University of Alabama
etdms.degree.level master's
etdms.degree.name M.S.

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