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: Accumulation rate; coprophilous fungi spores; Aerophilous diatoms; Age; AMS 14C dating on pollen concentrates; Clam routine on R; Arboreal pollen; Azores Archipelago; Carbon; organic; total; 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; Coccoliths; standard deviation; Diatom analysis (Battarbee; 1986; in Berglund; Handbook of Holocene Pal.); Diatoms; benthic; planktic; Ginjal_2018; Lake Ginjal; Terceira Island; Mass spectrometer Finnigan Finnigan delta Plus EA-CF-IRMS; multiproxy; Nitrogen; oceanic island; Orthocladiinae; Pollen; North Atlantic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.933674; https://doi.org/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.