http://bolin.su.se/data/west-2019-amino-acid-1 Gabriel West, Darrell S. Kaufman, Francesco Muschitiello, Matthias Forwick, Jens Matthiessen, Jutta Wollenburg, Matt O'Regan Bolin Centre Database 2019 Datafile Marine Sediment cores Amino acid racemization Quaternary geochronology Foraminifera Arctic Ocean Earth science > Oceans > Marine sediments Gabriel West 2019-10-30T16:08:19+00:00 English 1 None, but cite West et al. (2019) <p> The dataset contains amino acid racemization (D/L) data on planktic (<i>Neogloboquadrina pachyderma</i>) and benthic (<i>Cassidulina neoteretis</i>) foraminifera samples from sites on the Yermak Plateau.</p> <p> Data are provided in one file containing nineteen data columns, in both xlsx and csv format. The data include extent of amino acid racemization (D/L) and concentration (pM/vial) for aspartic acid (Asp), glutamic acid (Glx), serine (Ser), screening criteria for rejected subsamples, number of foraminifera tests/vial used.</p> <p> Data column headers: Lab ID (UAL), Ocean, Area, Core Core depth (m), Latitude (°N), Longitude (°E), Water depth (m), Genus, Species, Number of tests, Rejection criterion, DL Asp, DL Glu, DL Ser, L-Ser/L-Asp, Asp Concentration (pM/vial), Glu Concentration (pM/vial), Ser Concentration (pM/vial).</p> <p> Rejection criteria are provided below the data table.</p> <p> Abbreviations:</p> <p> D/L = ratio of D and L isomers</p> <p> Asp = aspartic acid</p> <p> Glu = glutamic acid</p> <p> Ser = serine This study investigates racemization rates in foraminifera from three well-dated sediment cores taken from the Yermak Plateau during the 2015 TRANSSIZ Expedition on RV Polarstern. D and L isomers of the amino acids, aspartic acid (Asp) and glutamic acid (Glu), were separated in samples of the planktic foraminifera, <i>Neogloboquadrina pachyderma</i> and the benthic species, <i>Cassidulina neoteretis</i> to quantify the extent of racemization. In total, 241 subsamples were analysed, extending back to marine oxygen isotope stage (MIS) 7. Two previously published power functions, which relate the extent of racemization of Asp and Glu in foraminifera to sample age are revisited, and a comparison is made between the ages predicted by these calibrated age equations and independent geochronological constraints available for the cores. Our analyses reveal an excellent match between ages predicted by a global compilation of racemization rates for <i>N. pachyderma</i>, and confirm that a proposed Arctic-specific calibration curve is not applicable at the Yermak Plateau. These results generally support the rates of amino acid racemization (AAR) determined for other cold bottom water sites, and further highlight the anomalous nature of the purportedly high rate of racemization indicated by previous analyses of central Arctic sediments.