/* DATA DESCRIPTION: Citation: Arnold, T Elliott (2026): Hydrogen isotopes of n-alkane biomarkers and brGDGT temperatures from Lake Tulane, Florida, USA [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.989435 Abstract: 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. Keyword(s): Branched GDGTs; Hydrogen isotopes; Lake core; Lake Tulane Supplement to: 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 References: 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 Coverage: LATITUDE: 27.585833 * LONGITUDE: 81.500361 DATE/TIME START: 2018-08-11T00:00:00 * DATE/TIME END: 2018-08-11T00:00:00 Event(s): Lake_Tulane_AC (Lake Tulane Archive Core) * LATITUDE: 27.585833 * LONGITUDE: 81.500361 * DATE/TIME: 2018-08-11T00:00:00 * LOCATION: Florida, USA * METHOD/DEVICE: Core (CORE) Lake_Tulane_SC (Lake Tulane Surface Core) * LATITUDE: 27.585833 * LONGITUDE: 81.500361 * DATE/TIME: 2018-08-11T00:00:00 * LOCATION: Florida, USA * METHOD/DEVICE: Core (CORE) Parameter(s): Event label (Event) * PI: Arnold, T Elliott (tea27@pitt.edu, https://www.geology.pitt.edu/people/elliott-arnold) Latitude of event (Latitude) * PI: Arnold, T Elliott (tea27@pitt.edu, https://www.geology.pitt.edu/people/elliott-arnold) Longitude of event (Longitude) * PI: Arnold, T Elliott (tea27@pitt.edu, https://www.geology.pitt.edu/people/elliott-arnold) Date/Time of event (Date/Time) * PI: Arnold, T Elliott (tea27@pitt.edu, https://www.geology.pitt.edu/people/elliott-arnold) Core (Core) * PI: Arnold, T Elliott (tea27@pitt.edu, https://www.geology.pitt.edu/people/elliott-arnold) Device type (Device) * PI: Arnold, T Elliott (tea27@pitt.edu, https://www.geology.pitt.edu/people/elliott-arnold) AGE [ka BP] (Age) * GEOCODE * PI: Arnold, T Elliott (tea27@pitt.edu, https://www.geology.pitt.edu/people/elliott-arnold) Temperature, water [°C] (Temp) * PI: Arnold, T Elliott (tea27@pitt.edu, https://www.geology.pitt.edu/people/elliott-arnold) * METHOD/DEVICE: Reconstructed, using branched GDGTs δ Deuterium, n-alkane C23 [‰] (δD n-alkane C23) * PI: Arnold, T Elliott (tea27@pitt.edu, https://www.geology.pitt.edu/people/elliott-arnold) * METHOD/DEVICE: See Device type column * COMMENT: vs. VSMOW δ Deuterium, n-alkane C27 [‰] (δD n-alkane C27) * PI: Arnold, T Elliott (tea27@pitt.edu, https://www.geology.pitt.edu/people/elliott-arnold) * METHOD/DEVICE: See Device type column * COMMENT: vs. VSMOW δ Deuterium, n-alkane C29 [‰] (δD n-alkane C29) * PI: Arnold, T Elliott (tea27@pitt.edu, https://www.geology.pitt.edu/people/elliott-arnold) * METHOD/DEVICE: See Device type column * COMMENT: vs. VSMOW δ Deuterium, n-alkane C31 [‰] (δD n-alkane C31) * PI: Arnold, T Elliott (tea27@pitt.edu, https://www.geology.pitt.edu/people/elliott-arnold) * METHOD/DEVICE: See Device type column * COMMENT: vs. VSMOW δ Deuterium, n-alkane C33 [‰] (δD n-alkane C33) * PI: Arnold, T Elliott (tea27@pitt.edu, https://www.geology.pitt.edu/people/elliott-arnold) * METHOD/DEVICE: See Device type column * COMMENT: vs. VSMOW δ Deuterium, n-alkane C35 [‰] (δD n-alkane C35) * PI: Arnold, T Elliott (tea27@pitt.edu, https://www.geology.pitt.edu/people/elliott-arnold) * METHOD/DEVICE: See Device type column * COMMENT: vs. VSMOW ε [‰] (ε) * PI: Arnold, T Elliott (tea27@pitt.edu, https://www.geology.pitt.edu/people/elliott-arnold) * METHOD/DEVICE: See Device type column * COMMENT: c29-c23 (‰ VSMOW) License: Creative Commons Attribution 4.0 International (CC-BY-4.0) (URI: https://creativecommons.org/licenses/by/4.0/) Status: Curation Level: Enhanced curation (URI: https://wiki.pangaea.de/wiki/Curation_levels) Size: 269 data points */ Event Latitude Longitude Date/Time Core Device Age [ka BP] Temp [°C] δD n-alkane C23 [‰] δD n-alkane C27 [‰] δD n-alkane C29 [‰] δD n-alkane C31 [‰] δD n-alkane C33 [‰] δD n-alkane C35 [‰] ε [‰] Lake_Tulane_SC 27.5858 81.5004 2018-08-11 LTS1 APCI/HPLC-MS 0 21.18 Lake_Tulane_SC 27.5858 81.5004 2018-08-11 LTS2 APCI/HPLC-MS 4 24.71 Lake_Tulane_SC 27.5858 81.5004 2018-08-11 LTS3 APCI/HPLC-MS 7 21.58 Lake_Tulane_SC 27.5858 81.5004 2018-08-11 LTS4 APCI/HPLC-MS 11 25.06 Lake_Tulane_SC 27.5858 81.5004 2018-08-11 LTS5 APCI/HPLC-MS 19 22.73 Lake_Tulane_SC 27.5858 81.5004 2018-08-11 LTS6 APCI/HPLC-MS 24 23.00 Lake_Tulane_SC 27.5858 81.5004 2018-08-11 LTS7 APCI/HPLC-MS 28 22.68 Lake_Tulane_SC 27.5858 81.5004 2018-08-11 LTS8 APCI/HPLC-MS 32 24.36 Lake_Tulane_SC 27.5858 81.5004 2018-08-11 LTS9 APCI/HPLC-MS 54 24.41 Lake_Tulane_SC 27.5858 81.5004 2018-08-11 LTS10 APCI/HPLC-MS 68 23.94 Lake_Tulane_SC 27.5858 81.5004 2018-08-11 LTS11 APCI/HPLC-MS 78 23.57 Lake_Tulane_SC 27.5858 81.5004 2018-08-11 LTAC1 APCI/HPLC-MS 17038 18.64 -137 -142 -151 -141 -144 Lake_Tulane_AC 27.5858 81.5004 2018-08-11 LTAC2 APCI/HPLC-MS (brGDGTs) and Thermo Trace GC Ultra coupled to a Thermo Electron Delta V Advantage IRMS (hydrogen isotopes) 17345 18.48 -127 -123 -140 -152 -148 -149 -15 Lake_Tulane_AC 27.5858 81.5004 2018-08-11 LTAC3 APCI/HPLC-MS (brGDGTs) and Thermo Trace GC Ultra coupled to a Thermo Electron Delta V Advantage IRMS (hydrogen isotopes) 17655 18.73 -144 -143 -151 -159 -156 -146 -8 Lake_Tulane_AC 27.5858 81.5004 2018-08-11 LTAC4 APCI/HPLC-MS (brGDGTs) and Thermo Trace GC Ultra coupled to a Thermo Electron Delta V Advantage IRMS (hydrogen isotopes) 17965 18.76 -148 -138 -149 -157 -154 -156 -1 Lake_Tulane_AC 27.5858 81.5004 2018-08-11 LTAC5 APCI/HPLC-MS (brGDGTs) and Thermo Trace GC Ultra coupled to a Thermo Electron Delta V Advantage IRMS (hydrogen isotopes) 23522 16.78 -124 -133 -144 -150 -142 -22 Lake_Tulane_AC 27.5858 81.5004 2018-08-11 LTAC6 APCI/HPLC-MS (brGDGTs) and Thermo Trace GC Ultra coupled to a Thermo Electron Delta V Advantage IRMS (hydrogen isotopes) 23706 16.38 -114 -124 -135 -153 -137 -140 -23 Lake_Tulane_AC 27.5858 81.5004 2018-08-11 LTAC7 APCI/HPLC-MS (brGDGTs) and Thermo Trace GC Ultra coupled to a Thermo Electron Delta V Advantage IRMS (hydrogen isotopes) 24447 16.97 -123 -132 -145 -155 -157 -155 -25 Lake_Tulane_AC 27.5858 81.5004 2018-08-11 LTAC8 APCI/HPLC-MS (brGDGTs) and Thermo Trace GC Ultra coupled to a Thermo Electron Delta V Advantage IRMS (hydrogen isotopes) 25519 15.98 -136 -133 -151 -157 -149 -148 -17 Lake_Tulane_AC 27.5858 81.5004 2018-08-11 LTAC9 APCI/HPLC-MS (brGDGTs) and Thermo Trace GC Ultra coupled to a Thermo Electron Delta V Advantage IRMS (hydrogen isotopes) 27716 20.05 -149 -138 -151 -161 -163 -162 -2 Lake_Tulane_AC 27.5858 81.5004 2018-08-11 LTAC10 APCI/HPLC-MS (brGDGTs) and Thermo Trace GC Ultra coupled to a Thermo Electron Delta V Advantage IRMS (hydrogen isotopes) 27925 17.44 -146 -132 -148 -158 -161 -163 -2 Lake_Tulane_AC 27.5858 81.5004 2018-08-11 LTAC11 APCI/HPLC-MS (brGDGTs) and Thermo Trace GC Ultra coupled to a Thermo Electron Delta V Advantage IRMS (hydrogen isotopes) 28030 17.79 -140 -134 -148 -158 -158 -160 -9 Lake_Tulane_AC 27.5858 81.5004 2018-08-11 LTAC12 APCI/HPLC-MS (brGDGTs) and Thermo Trace GC Ultra coupled to a Thermo Electron Delta V Advantage IRMS (hydrogen isotopes) 28134 18.54 -144 -136 -149 -156 -158 -158 -6 Lake_Tulane_AC 27.5858 81.5004 2018-08-11 LTAC13 APCI/HPLC-MS (brGDGTs) and Thermo Trace GC Ultra coupled to a Thermo Electron Delta V Advantage IRMS (hydrogen isotopes) 29693 15.21 -116 -136 -145 -153 -149 -156 -33 Lake_Tulane_AC 27.5858 81.5004 2018-08-11 LTAC14 APCI/HPLC-MS (brGDGTs) and Thermo Trace GC Ultra coupled to a Thermo Electron Delta V Advantage IRMS (hydrogen isotopes) 30075 15.21 -120 -130 -141 -151 -143 -138 -24 Lake_Tulane_AC 27.5858 81.5004 2018-08-11 LTAC15 APCI/HPLC-MS (brGDGTs) and Thermo Trace GC Ultra coupled to a Thermo Electron Delta V Advantage IRMS (hydrogen isotopes) 30457 16.80 -129 -138 -145 -151 -146 -149 -18 Lake_Tulane_AC 27.5858 81.5004 2018-08-11 LTAC16 APCI/HPLC-MS (brGDGTs) and Thermo Trace GC Ultra coupled to a Thermo Electron Delta V Advantage IRMS (hydrogen isotopes) 31804 17.40 -129 -139 -145 -157 -155 -143 -18 Lake_Tulane_AC 27.5858 81.5004 2018-08-11 LTAC17 APCI/HPLC-MS (brGDGTs) and Thermo Trace GC Ultra coupled to a Thermo Electron Delta V Advantage IRMS (hydrogen isotopes) 36347 19.38 -158 -135 -156 -169 -170 -164 2 Lake_Tulane_AC 27.5858 81.5004 2018-08-11 LTAC18 APCI/HPLC-MS (brGDGTs) and Thermo Trace GC Ultra coupled to a Thermo Electron Delta V Advantage IRMS (hydrogen isotopes) 36891 18.25 -149 -132 -155 -170 -169 -7 Lake_Tulane_AC 27.5858 81.5004 2018-08-11 LTAC19 APCI/HPLC-MS (brGDGTs) and Thermo Trace GC Ultra coupled to a Thermo Electron Delta V Advantage IRMS (hydrogen isotopes) 37023 18.04 -153 -140 -155 -166 -168 -158 -2 Lake_Tulane_AC 27.5858 81.5004 2018-08-11 LTAC20 APCI/HPLC-MS (brGDGTs) and Thermo Trace GC Ultra coupled to a Thermo Electron Delta V Advantage IRMS (hydrogen isotopes) 37155 17.62 -143 -143 -151 -168 -167 -156 -9 Lake_Tulane_AC 27.5858 81.5004 2018-08-11 LTAC21 APCI/HPLC-MS (brGDGTs) and Thermo Trace GC Ultra coupled to a Thermo Electron Delta V Advantage IRMS (hydrogen isotopes) 38121 17.23 -124 -131 -152 -159 -161 -156 -33 Lake_Tulane_AC 27.5858 81.5004 2018-08-11 LTAC22 APCI/HPLC-MS (brGDGTs) and Thermo Trace GC Ultra coupled to a Thermo Electron Delta V Advantage IRMS (hydrogen isotopes) 38926 16.20 -123 -135 -143 -155 -148 -150 -23 Lake_Tulane_AC 27.5858 81.5004 2018-08-11 LTAC23 APCI/HPLC-MS (brGDGTs) and Thermo Trace GC Ultra coupled to a Thermo Electron Delta V Advantage IRMS (hydrogen isotopes) 39896 17.30 -131 -137 -147 -162 -165 -160 -19 Lake_Tulane_AC 27.5858 81.5004 2018-08-11 LTAC24 APCI/HPLC-MS (brGDGTs) and Thermo Trace GC Ultra coupled to a Thermo Electron Delta V Advantage IRMS (hydrogen isotopes) 41029 17.75 -129 -135 -144 -161 -156 -150 -17