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

• Main Authors: Raposeiro, Pedro Miguel, Hernández, Armand, Gonçalves, Vítor, Bao, Roberto, Sáez, Alberto, Shanahan, Timothy M, Rúbio, Maria Jesus, Vázquez-Loureiro, David, Giralt, Santiago
• Format: Dataset
• Language: English
• Published: PANGAEA 2021
• Subjects: Accumulation rate; 5alpha-stigmastan-3beta-ol; 5beta-cholestan-3beta-ol; Aerophilous diatoms; Age; Azores Archipelago; Azul11; Carbon; organic; total; total/Nitrogen; total ratio; Carbon dioxide; partial pressure; blood; standard error; Chironomid analysis (Brooks et al; 2007; The identification and use of Palaeartic Chironomid Larvae in Palaecology); Chironomini; deep lake; Development of a CCAMLR Marine Protected Area in the Antarctic Weddell Sea; Diatom analysis (Battarbee; 1986; in Berglund; Handbook of Holocene Pal.); Diatoms; benthic; planktic; Gas chromatography - Mass spectrometry (GC-MS); GCUWI; Gravity corer; UWITEC; Lake Azul; Azores; Mass spectrometer Finnigan Finnigan delta Plus EA-CF-IRMS; multiproxy; Nitrogen; oceanic island; Orthocladiinae; Tanypodinae; Tanytarsini; WSMPA; δ13C; Antarctic; The Antarctic; Weddell Sea; Weddell; Berglund; Antarc*; North Atlantic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.933710; https://doi.org/10.1594/PANGAEA.933710

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 Azul located in São Miguel island has a surface area of 4.35 km, 28m of maximum depth and is located at 259m above sea level. A coring campaign was conducted in September 2011 using a 60mm diameter UWITEC gravity corer from UWITEC floating platform retrieving a Core AZ11_02 (1.70 m long) located in the deep basin of the lake (27m depth). 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 660 years.