Central Arctic Ocean 150KYr Amino Acid Racemization Data Kaufman, D.S.; Polyak, L.; Adler, R.; Channell, J.E.T.; Xuan, C. Kaufman, D.S. Polyak, L. Adler, R. Channell, J.E.T. Xuan, C. Arctic earth science/paleoclimate/others (88AR-P5>LATITUDE 74.6225>LONGITUDE -157.884) (HLY0503-11MC-2>LATITUDE 83.1283>LONGITUDE -174.693) (96/12-1PC>LATITUDE 87.0983>LONGITUDE -144.773) (HLY0503-8JPC>LATITUDE 79.5933>LONGITUDE -172.502) (HLY0503-10MC-2>LATITUDE 81.2283>LONGITUDE -177.216) The long-term rate of racemization for amino acids preserved in planktonic foraminifera was determined by using independently dated sediment cores from the Arctic Ocean. The racemization rates for aspartic acid (Asp) and glutamic acid (Glu) in the common taxon, Neogloboquadrina pachyderma, were calibrated for the last 150 ka using 14C ages and the emerging Quaternary chronostratigraphy of Arctic Ocean sediments. An analysis of errors indicates realistic age uncertainties of about ±12% for Asp and ±17% for Glu. Fifty individual tests are sufficient to analyze multiple subsamples, identify outliers, and derive robust sample mean values. The new age equation can be applied to verify and refine age models for sediment cores elsewhere in the Arctic Ocean, a critical region for understanding the dynamics of global climate change. STUDY NOTES: Amino acid racemization data on N. pachyderma samples from marine sediment cores in the central Arctic Ocean. D/L and concentration for aspartic acid, glutamic acid, and serine in Neogloboquadrina pachyderma from sediment cores from Lomonosove, Mendeleev, and Northwind ridges, central Arctic Ocean. Lab: Northern Arizona University Lab PI: Kaufman, D.S. Preparation date: Nov 2006 through Jan 2008 Pretreatment: Sieve >150 µm, repeated sonication, 3% pyroxide for 2 hr AA fraction = AMINO FRACTION Hydrolysis procedure: 6 hr at 110°C in 7 µL of 6 M HCl under N2 Bleach: No Analytical method: RPLC Instrumental programming: Concentration is based on internal calibration with L-hArg Area or height ratio: Height Blank corrections: none Response factors: none Data screening criteria: Rejection criteria: 1 = L-Ser/L-Asp > 0.8; 2 = Asp or Glu D/L fall off the covarience trend; 3 = Asp or Glu D/L > ± 2s beyond group mean Collector: Polynak, Leoind, Ohio State University NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Kaufman, D.S. Investigator : Polyak, L. Investigator : Adler, R. Investigator : Channell, J.E.T. Investigator : Xuan, C. 2011-01-22 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/10293 https://www1.ncdc.noaa.gov/pub/data/paleo/aar/kaufman2008arctic/kaufman2008arctic.txt https://www1.ncdc.noaa.gov/pub/data/paleo/aar/kaufman2008arctic/kaufman2008arctic.xls https://www1.ncdc.noaa.gov/pub/data/paleo/aar/kaufman2008arctic/kaufman2008arctic.txt https://www1.ncdc.noaa.gov/pub/data/paleo/aar/kaufman2008arctic/kaufman2008arctic.xls English https://www.ncdc.noaa.gov/paleo/study/10293 https://www1.ncdc.noaa.gov/pub/data/paleo/aar/kaufman2008arctic/kaufman2008arctic.txt https://www1.ncdc.noaa.gov/pub/data/paleo/aar/kaufman2008arctic/kaufman2008arctic.xls Kaufman, D.S., L. Polyak, R. Adler, J.E.T. Channell, and C. Xuan. 2008. Dating late Quaternary planktonic foraminifer Neogloboquadrina pachyderma from the Arctic Ocean using amino acid racemization. Paleoceanography, Vol. 23, PA3224, doi:10.1029/2008PA001618. START YEAR: 222000 cal yr BP * END YEAR: 1000 cal yr BP -177.216 74.6225 -144.773 87.0983