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: English
• Published: PANGAEA
• Subjects: 145-883B; 145-883C; Accumulation rate; alkenone C37; AGE; Age model; Alkenone; C37; standard deviation; C37 per unit sediment mass; Alkenones; Benthic foraminifera assemblages; benthic foraminiferal stable isotopes; Calcium Carbonate content; Calculated; Composite splice; Depth; composite; sediment/rock; diatoms; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Gas Chromatograph; Agilent 7890; Joides Resolution; Leg145; North Pacific Ocean; Ocean Drilling Program; ODP; ODP 883; ODP 887; Sample code/label; Sedimentation rate; stable carbon isotopes δ13C; stable oxygen isotopes; Subarctic North Pacific; Uk'37 sst and C37total; Pacific; Fid; Subarctic
• Online Access: 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 of 504 samples were analyzed at least in duplicate, yielding a mean standard deviation of 0.017 pmol•mg-1 or 9.2 ng*g-1.