Plant wax biomarkers record from sediment core PEX19-01, Lake Peixão, Serra da Estrela, Portugal

These data comprise a downcore record (PEX19-01) of plant wax n-alkanes (concentration and compound-specific δ2H and δ13C isotopes) from Lake Peixão (40°20'35" N, 7°36'19" W), a small alpine lake located at 1677 meters above sea level in the Serra da Estrela Mountain, Portugal. The lake covers an area of 0.02 km² with a maximum water depth of approximately 5 meters. Characterized as oligotrophic, slightly acidic, and monomictic, Lake Peixão's settings and location present an ideal setting for paleoenvironmental studies between Atlantic and Mediterranean-influenced climates. Sediment cores were collected at a depth of about 4 meters during a field campaign from June 10 to June 14, 2019, using a UWITEC© piston coring system from a floating platform, and a short core (PEX15-01C; 1.23 m long) using a UWITEC gravity coring system (see Moreno et al., 2023). According to the age model by Hernández et al., 2023, the studied section of the sediment core (upper 120 cm) spans the last 2000 years with a mean resolution of 30 ± 10 years for n-alkane samples.