Alkenone concentration of ODP Site 145-883 ...

• Main Authors: Novak, Joseph B, Caballero-Gill, Rocio P, Rose, Rebecca, Herbert, Timothy D, Dowsett, Harry J
• Format: Dataset
• Language: unknown
• Published: PANGAEA 2024
• Subjects: Age model; Alkenones; Benthic foraminifera assemblages; Benthic foraminiferal stable isotopes; Calcium Carbonate content; Composite splice; diatoms; ODP 883; ODP 887; stable carbon isotopes δ13C; stable oxygen isotopes; Subarctic North Pacific; Uk'37 sst and C37total; Event label; Sample code/label; DEPTH, sediment/rock; Depth, composite; AGE; Sedimentation rate; Alkenone, C37 per unit sediment mass; Alkenone, C37, standard deviation; Accumulation rate, alkenone C37; Drilling/drill rig; DSDP/ODP/IODP sample designation; Gas Chromatograph, Agilent 7890; Calculated; Leg145; Joides Resolution; Ocean Drilling Program ODP; Fid; Pacific; Subarctic
• Online Access: https://dx.doi.org/10.1594/pangaea.967364; https://doi.pangaea.de/10.1594/PANGAEA.967364

Here we present concentration and mass accumulation rate of C37 alkenones in discrete samples from ODP site 883. Approximately 1–4 g of sediment was freeze-dried and homogenized prior to extraction with a Dionex 200 Accelerated Solvent Extractor using 100% dichloromethane. Prior to quantification, the total lipid extract was evaporated under N2 and redissolved in 200 μL toluene spiked with n-hexatriacontane (C36) and n-heptatriacontane (C37) standards. Alkenone concentrations were calculated by comparison of C37:2 and C37:3 alkenone peak areas to the peak areas of the C36 and C37 internal standards determined by an Agilent Technologies 6890 gas chromatograph flame ionization detector (GC-FID), with an Agilent Technologies DB-1 column (60 m, 0.32 mm diameter, 0.10 mm film thickness). 1 μL of total lipid extract was injected at an initial temperature of 90°C, increasing to 255°C at 40°C/min, then to 300°C at 1°C/min, ramping to 320°C at 10°C/min, and ending with an isothermal hold at 320°C for 11 minutes. 228 ...