Publication Date:
2024-02-23
Description:
To evaluate changes in terrestrial and aquatic ecosystems in the Azores, we developed paleoecological and paleoclimate records from Lake Funda on Flores Island that span the last millennium. Vegetation composition (n-alkane average chain length) indicate when human activities began in the catchment area and biogenic silica tracks changes in diatom productivity. In addition, sterol hydrogenation and archaeal lipids (isoprenoid glycerol dialkyl glycerol tetraethers) trace changes in redox conditions and biogeochemical cycles, respectively. Finally, a high-resolution reconstruction using leaf wax hydrogen isotopes records changes in precipitation amount over the last millennium.
Keywords:
Acyclic glycerol dialkyl glycerol tetraether, fractional abundance; Age; AGE; Agilent 6890N gas chromatography (GC) system and a flame ionization detector (FID); Agilent 7890B gas chromatography (GC) with an Agilent 5977B quadrupole mass spectrometer (MS); AMS 14C dating on pollen concentrates; Clam routine on R; Atmospheric Pressure Chemical Ionization/High Performance Liquid Chromatography-Mass Spectrometer (APCI/HPLC-MS); Auto Analyzer Technicon AAII; beta-Sitosterol, flux; biogenic silica; C16-Fatty acid methyl esters, fractional abundance; C18-Fatty acid methyl esters, fractional abundance; C20-Fatty acid methyl esters, fractional abundance; C22-Fatty acid methyl esters, fractional abundance; C22-fatty acid methyl esters, δD; C22-fatty acid methyl esters, δD, standard deviation; C24-Fatty acid methyl esters, fractional abundance; C26-Fatty acid methyl esters, fractional abundance; C28-Fatty acid methyl esters, fractional abundance; C28-fatty acid methyl esters, δD; C28-fatty acid methyl esters, δD, standard deviation; C30-Fatty acid methyl esters, fractional abundance; C30-fatty acid methyl esters, δD; C30-fatty acid methyl esters, δD, standard deviation; C32-Fatty acid methyl esters, fractional abundance; Campestanol, flux; Campesterol, flux; Cholestanol, flux; Cholesterol, flux; Comment; Crenarchaeol, fractional abundance; Crenarchaeol isomer, fractional abundance; DEPTH, sediment/rock; Dicyclic glycerol dialkyl glycerol tetraether, fractional abundance; Epi-coprostanol flux; Funda_2017; Gas Chromatograph (GC), Manufacturer unknown, custom built; coupled with Isotope Ratio Mass Spectrometer (IRMS), Thermo Scientific, Delta V Plus; GCUWI; GDGTs; Gravity corer, UWITEC; hydrogen isotope; Lake Funda, Flores Island, Azores; lake sediment proxies; leaf waxes; Monocyclic glycerol dialkyl glycerol tetraether, fractional abundance; n-Alkane C21, fractional abundance; n-Alkane C23, fractional abundance; n-Alkane C25, fractional abundance; n-Alkane C27, fractional abundance; n-Alkane C29, fractional abundance; n-Alkane C31, fractional abundance; n-Alkane C33, fractional abundance; Silicon; Silicon dioxide; sterols; Stigmastanol, flux; Stigmasterol, flux; Tricyclic glycerol dialkyl glycerol tetraether, fractional abundance
Type:
Dataset
Format:
text/tab-separated-values, 2362 data points
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