noaa-other-10293 Central Arctic Ocean 150KYr Amino Acid Racemization Data Kaufman, D.S.; Polyak, L.; Adler, R.; Channell, J.E.T.; Xuan, C. Central Arctic Ocean 150KYr Amino Acid Racemization Data 2011-01-22 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/10293 Investigator D.S. Kaufman Investigator L. Polyak Investigator R. Adler Investigator J.E.T. Channell Investigator C. Xuan earth science paleoclimate others geoscientificInformation Arctic 222000 cal yr BP 1000 cal yr BP Complete 74.6225 87.0983 -177.216 -144.773 -2792 -1003 Ocean Arctic Ocean 88AR-P5>LATITUDE 74.6225>LONGITUDE -157.884 Ocean Arctic Ocean HLY0503-11MC-2>LATITUDE 83.1283>LONGITUDE -174.693 Ocean Arctic Ocean 96/12-1PC>LATITUDE 87.0983>LONGITUDE -144.773 Ocean Arctic Ocean HLY0503-8JPC>LATITUDE 79.5933>LONGITUDE -172.502 Ocean Arctic Ocean HLY0503-10MC-2>LATITUDE 81.2283>LONGITUDE -177.216 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII 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.

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

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/aar/kaufman2008arctic/kaufman2008arctic.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/aar/kaufman2008arctic/kaufman2008arctic.xls USA/NOAA DIF Version 9.8.4 2019-03-27 2019-03-27