Hydrogen isotopes of n-alkane biomarkers and brGDGT temperatures from Lake Tulane, Florida, USA
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
2026
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| _version_ | 1867168242200477696 |
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| author | Arnold, T Elliott |
| author_facet | Arnold, T Elliott |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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 + 2HC29)/(1000 + 2HC23), and (2) ε(C29-C23) = (α -1) x 1000. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_989435 |
| institution | PANGAEA |
| language | en |
| publishDate | 2026 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Hydrogen isotopes of n-alkane biomarkers and brGDGT temperatures from Lake Tulane, Florida, USA Arnold, T Elliott AGE; Branched GDGTs; Core; CORE; Date/Time of event; Device type; Event label; Florida, USA; Hydrogen isotopes; Lake_Tulane_AC; Lake_Tulane_SC; Lake core; Lake Tulane; Lake Tulane Archive Core; Lake Tulane Surface Core; Latitude of event; Longitude of event; Reconstructed, using branched GDGTs; See Device type column; 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 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 + 2HC29)/(1000 + 2HC23), and (2) ε(C29-C23) = (α -1) x 1000. |
| title | Hydrogen isotopes of n-alkane biomarkers and brGDGT temperatures from Lake Tulane, Florida, USA |
| topic | AGE; Branched GDGTs; Core; CORE; Date/Time of event; Device type; Event label; Florida, USA; Hydrogen isotopes; Lake_Tulane_AC; Lake_Tulane_SC; Lake core; Lake Tulane; Lake Tulane Archive Core; Lake Tulane Surface Core; Latitude of event; Longitude of event; Reconstructed, using branched GDGTs; See Device type column; 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 |
| url | https://doi.org/10.1594/PANGAEA.989435 |