Multi-proxy analysis of sediment cores from Lake Ginjal (Azores archipelago, Portugal) ...

• Main Authors: Raposeiro, Pedro Miguel, Ritter, Catarina, Salcedo, Marina, Aguiar, Nicole, de Boer, Erik J, Bao, Roberto, Sáez, Alberto, Giralt, Santiago, Gonçalves, Vítor
• Format: Dataset
• Language: English
• Published: PANGAEA 2021
• Subjects: Azores Archipelago; multiproxy; oceanic island; Shallow lake; AGE; Age; Aerophilous diatoms; Diatoms, benthic; Carbon dioxide, partial pressure, blood, standard error; Diatoms, planktic; Chironomini; Orthocladiinae; Tanytarsini; Coccoliths, standard deviation; Charcoal, flux; Accumulation rate, coprophilous fungi spores; Arboreal pollen; Pollen, shrubs; Pollen, herbs; Carbon, organic, total/Nitrogen, total ratio; Carbon, organic, total; δ13C; Nitrogen, total; δ15N; Russian corer; AMS 14C dating on pollen concentrates; Clam routine on R; Diatom analysis Battarbee, 1986, in Berglund, Handbook of Holocene Pal.; Chironomid analysis Brooks et al, 2007, The identification and use of Palaeartic Chironomid Larvae in Palaecology; Charcoal analysis Whitlock & Larsen, 2001, in Birks & Last, Tracking Environmental Change Using Lake Sediments; Pollen analysis Bennett & Willis, 2001, in Birks & Last, Tracking Environmental Change Using Lake Sediments; Mass spectrometer Finnigan Finnigan delta Plus EA-CF-IRMS; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.933674; https://doi.pangaea.de/10.1594/PANGAEA.933674

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. In 2018, a sediment core was recovered from Lake Ginjal on Terceira island. A 3.5 m long sediment core was taken using a Russian chamber corer, 0.5 m long, with 5 cm diameter. Lake Ginjal occupies the bottom of a small crater at 390 m above sea level located in the plains of Achada, the oldest volcanic crater of Terceira island. Its maximum length and width are 120 m and 70 m, respectively, and its maximum water depth is 1 m. 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 550 years. ...