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  • 2020-2024  (3)
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  • 1
    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
    Location Call Number Expected Availability
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  • 2
    Publication Date: 2024-01-13
    Description: We present a quantitative NAO reconstruction for the central Iberian Peninsula (IP) over the last two millennia, along with its uncertainties, by applying a Bayesian approach.
    Keywords: Age; AGE; Bayesian Modeling; CIM12-04A; Common Era; Iberian Central Range, Spain; lake sediments; Modes of Variability; NAO; North Atlantic Oscillation index; Uncertainty
    Type: Dataset
    Format: text/tab-separated-values, 1302 data points
    Location Call Number Expected Availability
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  • 3
    Publication Date: 2024-01-27
    Description: The Azores archipelago is a group of nine oceanic volcanic islands located in the mid-North Atlantic, roughly 1500 km from Europe and 1900 km from America. Lake Funda is situated in the southern sector of the central plateau of Flores Island at 351 m altitude and occupies the bottom of a small maar-explosion crater with 875 m in length and 625 m width, with a total area of 0.37 km2 where several water lines converge. A coring campaign was conducted in June 2017 using a 60mm diameter UWITEC gravity corer from UWITEC floating platform retrieving a core (9.97 m long) located in the deepest part of the lake. The core was dated using ¹⁴C and produced a multi-proxy dataset of geochemical and biological analyses that we used to uncover paleoenvironmental changes on Lake Azul in the last 1300 years.,
    Keywords: Accumulation rate, 5alpha-stigmastan-3beta-ol; Accumulation rate, 5beta-cholestan-3beta-ol; Accumulation rate, coprophilous fungi spores; Accumulation rate, macrophytes seeds; Aerophilous diatoms; Age; AGE; AMS 14C dating on pollen concentrates; Clam routine on R; Arboreal pollen; Azores Archipelago; Carbon, organic, total; Carbon, organic, total/Nitrogen, total ratio; Carbon dioxide, partial pressure, blood, standard error; Charcoal, flux; Charcoal analysis (Whitlock & Larsen, 2001, in Birks & Last, Tracking Environmental Change Using Lake Sediments); Chironomid analysis (Brooks et al, 2007, The identification and use of Palaeartic Chironomid Larvae in Palaecology); Chironomini; Chromatography; Coccoliths, standard deviation; deep lake; Diatom analysis (Battarbee, 1986, in Berglund, Handbook of Holocene Pal.); Diatoms, benthic; Diatoms, planktic; Funda_2017; GCUWI; Gravity corer, UWITEC; Lake Funda, Flores Island, Azores; Mass spectrometer Finnigan Finnigan delta Plus EA-CF-IRMS; multiproxy; Nitrogen, total; oceanic island; Orthocladiinae; Pollen, herbs; Pollen, shrubs; Pollen analysis (Bennett & Willis, 2001, in Birks & Last, Tracking Environmental Change Using Lake Sediments); Tanypodinae; Tanytarsini; δ13C; δ15N
    Type: Dataset
    Format: text/tab-separated-values, 1202 data points
    Location Call Number Expected Availability
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