noaa-ocean-19500 North Alaska Continental Margin Late Pleistocene Physical Properties Data Nam, S.-I. North Alaska Continental Margin Late Pleistocene Physical Properties Data 2015-11-02 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/19500 Investigator S.-I. Nam earth science paleoclimate paleoceanography P-wave amplitude,sediment,null,dimensionless,null,paleoceanography,null,null,N,compressional wave amplitude earth science paleoclimate paleoceanography density,wet sediment,null,gram per cubic centimeter,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography impedance,sediment,null,dimensionless,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography resistivity,sediment,null,ohm meter,null,paleoceanography,null,null,N,noncontact resistivity earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,N,section number earth science paleoclimate paleoceanography porosity,sediment,null,dimensionless,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography volume magnetic susceptibility,sediment,null,dimensionless (SI system),null,paleoceanography,null,null,N,x10-6 units earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,N,core thickness earth science paleoclimate paleoceanography magnetic susceptibility,sediment,null,dimensionless (SI system),null,paleoceanography,null,null,N,x10-5 units earth science paleoclimate paleoceanography depth,null,null,meter,null,paleoceanography,null,null,N,MBSF earth science paleoclimate paleoceanography resistivity,sediment,null,millivolt,null,paleoceanography,corrected,null,N,noncontact resistivity earth science paleoclimate paleoceanography resistivity,sediment,null,millivolt,null,paleoceanography,null,null,N,noncontact resistivity earth science paleoclimate paleoceanography depth,null,null,centimeter,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography P-wave velocity,sediment,null,meter per second,null,paleoceanography,null,null,N,compressional wave velocity earth science paleoclimate paleocean physical properties geoscientificInformation 30000 cal yr BP 0 cal yr BP Complete 73.367 73.367 -152.4005 -152.4005 Ocean Arctic Ocean ARA04B-02GC>LATITUDE 73.367>LONGITUDE -152.4005 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 Niessen, F., Stein, R., Matthiessen, J., Jensen, L., Nam, S.-I., Schrek, M. 2015 Geophysical Research Abstracts 17 EGU2015-10670

Recently glacial landforms were presented and interpreted as complex pattern of Pleistocene glaciations in the western Arctic Ocean along the continental margin of the East Siberian and Chukchi seas, (Niessen et al. 2013, Dove et al. 2014). These landforms include moraines, drumlins, glacigenic debris flows, till wedges and mega-scale glacial lineations. Orientations of some of the landforms suggest the presence of former ice sheets on the Chukchi Borderland and the East Siberian shelf. Here we present a tentative age model for some of the younger glacial events by correlation of sediment cores with glacial landforms as seen in subbottom profiles. The database was obtained during RV "Polarstern" cruise ARK-XIII/3 (2008) and RV "Araon" cruise ARA03B (2012), which investigated an area between the Chukchi Borderland and the East Siberian Sea between 165W and 170E. The stratigraphic correlation of sediment cores is based on physical properties (wet-bulk density and magnetic susceptibility), lithology and color. The chronology of the area has been proposed by Stein et al. (2010) for a core from the Chukchi Abyssal Plain (PS72/340-5) and includes brown layers B1 to B9 (marine isotope stages MIS 1 to MIS 7), which are used as marker horizons for lateral core correlation. Our tentative age model suggests that the youngest and shallowest (480 m below present water level; mbpwl) grounding event of an ice sheet on the Chukchi Borderland is younger than B2 (interpreted as Last Glacial Maximum; LGM). There is no clear evidence for a LGM glaciation along the East Siberian margin because intensive post LGM iceberg scouring occurred above 350 m present water level. On the slopes of the East Siberian Sea two northerly directed ice advances occurred, both of which are older and younger than B2 and B3, respectively. The younger advance grounded to about 700 m present water depth along the continental slope and the older to 900 m and 1100 m on the Arlis Plateau and the East Siberian continental margin, respectively. We interpret these advances as Middle Weichselian glaciations on the Beringian shelf (MIS 4 to 3). Two older glaciations can be dated as Early Weichselian (MIS 5b to 5d), of which the younger event is older and younger than B3 and B4, respectively. This glaciation can be traced by glacial wedges, streamlined lineations in up to 1200 mbpsl and subglacial diamicton along the East Siberian margin, the Arlis Plateau, and the Mendeleev Ridge. There are at least three older glaciation visible in acoustic images from the East Siberian continental margin, which probably predate the Weichselian. The available cores did not penetrate these events and the ages remain speculative. STUDY NOTES: Sediment physical properties data for 7 cores collected in 2013 by RV Araon on the North Alaskan Continental Margin, US EEZ waters. Parameters measured include velocity, density, impedance, magnetic susceptibility, porosity, and resistivity.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/nam2015/nam2015-4c03.txt Data File; Core ARA04C-03GC Physical Properties Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/nam2015/nam2015-4c04.txt Data File; Core ARA04C-04GC Physical Properties Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/nam2015/nam2015-4c02.txt Data File; Core ARA04C-02GC Physical Properties Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/nam2015/nam2015-4b19.txt Data File; Core ARA04B-19GC Physical Properties Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/nam2015/nam2015-4b02.txt Data File; Core ARA04B-02GC Physical Properties Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/nam2015/nam2015-4c01.txt Data File; Core ARA04C-01GC Physical Properties Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/nam2015/nam2015-4b03.txt Data File; Core ARA04B-03GC Physical Properties Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11