PANGAEA_989435 Hydrogen isotopes of n-alkane biomarkers and brGDGT temperatures from Lake Tulane, Florida, USA Arnold, T Elliott Hydrogen isotopes of n-alkane biomarkers and brGDGT temperatures from Lake Tulane, Florida, USA 2026-01-26 PANGAEA Dataset https://doi.pangaea.de/10.1594/PANGAEA.989435 Investigator T Elliott Arnold tea27@pitt.edu Earth Science Event label Latitude of event Longitude of event Date/Time of event Core Device type AGE Temperature, water δ Deuterium, n-alkane C23 δ Deuterium, n-alkane C27 δ Deuterium, n-alkane C29 δ Deuterium, n-alkane C31 δ Deuterium, n-alkane C33 δ Deuterium, n-alkane C35 ε geoscientificInformation Branched GDGTs Core Hydrogen isotopes Lake_Tulane_AC Lake_Tulane_SC Lake core Lake Tulane Lake Tulane Archive Core Lake Tulane Surface Core Reconstructed, using branched GDGTs See Device type column 2018-08-11 2018-08-11 Complete 27.585833 27.585833 81.500361 81.500361 unrestricted CC-BY-4.0: Creative Commons Attribution 4.0 International English PANGAEA Data Publisher for Earth & Environmental Science https://www.pangaea.de/ Data Center Contact Michael Diepenbroek info@pangaea.de

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Bremen Bremen 28359 Germany online 269 data points text/tab-separated-values Arnold, T Elliott; Hilliker, J L; Werne, Josef P; Thompson, A J (in review): Atmospheric transmission of temperature and precipitation change in Florida during North Atlantic Heinrich events. Paleoceanography and Paleoclimatology O'Beirne, Molly D; Scott, Wesley P; Werne, Josef P (2023): A critical assessment of lacustrine branched glycerol dialkyl glycerol tetraether (brGDGT) temperature calibration models. Geochimica et Cosmochimica Acta, 359, 100-118, https://doi.org/10.1016/j.gca.2023.08.019

This dataset includes temperatures derived from branched glycerol dialkyl glycerol tetraethers (brGDGTs) and regional hydrology changes reconstructed from hydrogen isotope ratios (δ2H) of n-alkanes extracted from a lacustrine sediment core from Lake Tulane, Florida, USA. In 1994, 8 cores from 6 locations (2 complete overlaps) were acquired from a transect along the north basin of Lake Tulane. Cores were taken with a 7.5-cm diameter Wright square-rod piston corer from an anchored raft. Separately, a single surface-water interface core was acquired from the north basin of Lake Tulane in 2010. brGDGTs and n-alkanes were extracted from archived core sections at 8-10 cm intervals in August of 2018 and from the surface-water interface core at 5 cm intervals in August of 2019. The archived core interval spanned Heinrich Stadials 4-2 (41,000-17,000 BP) and the surface-water interface core spanned 78-0 BP. brGDGT distributions from both cores were measured via atmospheric pressure chemical ionization high-performance liquid chromatography-mass spectrometry (APCI/HPLC–MS), and hydrogen isotope ratios of n-alkanes were measured on a Thermo Trace GC Ultra coupled to a Thermo Electron Delta V Advantage IRMS with an Isolink combustion furnace. The brGDGT data was converted to degrees Celsius (°C) following the open-sourced code provided in O'Beirne et al. (2023, doi:10.1016/j.gca.2023.08.019). Hydrogen isotope results are given in the conventional δ-notation. A proxy for seasonal precipitation and aridity (ε(C29-C23)) was created, which reflects the difference between the δ2H values of aquatic n-alkanes (δ2HC23) and terrestrial leaf wax δ2H values (δ2HC29) using the following equations: (1) α = (1000 + 𝛿2HC29)/(1000 + 𝛿2HC23), and (2) ε(C29-C23) = (α -1) x 1000. ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.989435"!

http://en.wikipedia.org/wiki/Kyr AGE https://doi.org/10.1016/j.gca.2023.08.019 A critical assessment of lacustrine branched glycerol dialkyl glycerol tetraether (brGDGT) temperature calibration models https://www.geology.pitt.edu/people/elliott-arnold DIF 9.4 2026-01-26 2026-04-30