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Climate response of the Florida Peninsula to Heinrich events in the North Atlantic
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|Authors:||Arnold, T. Elliott; Diefendorf, Aaron F.; Brenner, Mark; Freeman, Katherine H.; Baczynski, Allison A.|
|Author Affiliations:||Primary: |
University of Florida, Department of Geological Sciences, Gainesville, FL, United States
University of Cincinnati, United States
Pennsylvania State University, United States
|Volume Title:||Quaternary Science Reviews|
|Source:||Quaternary Science Reviews, Vol.194, p.1-11. Publisher: Elsevier, International. ISSN: 0277-3791|
|Note:||In English. 84 refs.; illus., incl. 3 tables, sketch map|
|Summary:||Hydrogen and carbon isotope values (δD & δ13C) were measured on lipid biomarkers from a sediment core collected in Lake Tulane, Florida, USA, to infer shifts in climate and hydrologic variables during the Last Glacial. Isotopic trends from 24 samples correlate with plant community shifts evaluated in a previous pollen study by Grimm et al. (2006). We observe maxima in Δleaf values and minima in δD values concurrent with peaks in Pinus pollen abundances and Heinrich Events 4-2. Increased Δleaf values during North Atlantic cold spells indicate lower water-use-efficiency among angiosperms around Lake Tulane. Combined δD values from terrestrial and aquatic lipids, confirm that aridity decreased during cold, stadial periods (Heinrich Events), and increased during warm, interstadials. Furthermore, lower δD values in aquatic lipids during stadials are attributed to warming, as well as changing moisture sources. The anti-phase relationship between temperatures and aridity derived from our subtropical lacustrine record and those at high latitude in the North Atlantic is likely the result of complex ocean-atmosphere teleconnections that resulted from the collapse of Atlantic Meridional Overturning Circulation during Heinrich Events in the North Atlantic.|
|Subjects:||Absolute age; Aliphatic hydrocarbons; Alkanes; Biomarkers; Biostratigraphy; C-13/C-12; C-14; Carbon; Cenozoic; Chemostratigraphy; Chronostratigraphy; Climate change; Cores; D/H; Heinrich events; Hydrocarbons; Hydrogen; Isotope ratios; Isotopes; Lacustrine environment; Lake sediments; Lipids; Lithostratigraphy; N-alkanes; Organic compounds; Paleoclimatology; Paleohydrology; Pleistocene; Quaternary; Radioactive isotopes; Sediments; Stable isotopes; Upper Pleistocene; Atlantic Ocean; Florida; North Atlantic; United States; Lake Tulane|
|Coordinates:||N273500 N273500 W0813000 W0813000|
|Copyright Information:||GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands|
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