noaa-ocean-10313 eng; USA utf8 dataset Bauer, Bruce DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce +1 303-497-6280 +1 303-497-6513 325 Broadway, E/CC23 Boulder CO 80305-3328 USA paleo@noaa.gov pointOfContact 2018-12-11 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) NOAA/WDS Paleoclimatology - Chukchi Sea Holocene Rock Magnetic Data 2010-12-31 publication noaa-ocean-10313 NCEI DSI 1200_01 Brachfeld, S. originator Brachfeld, S. author Barletta, F. originator Barletta, F. author St-Onge, G. originator St-Onge, G. author Darby, D. originator Darby, D. author Ortiz, J.D. originator Ortiz, J.D. author NOAA National Centers for Environmental Information publisher tableDigital This archived Paleoclimatology Study is available from the NOAA National Centers for Environmental Information (NCEI), under the World Data Service (WDS) for Paleoclimatology. The associated NCEI study type is Paleoceanography. The data include parameters of paleoceanography with a geographic location of Chukchi Sea. The time period coverage is from 9330 to 1350 in calendar years before present (BP). See metadata information for parameter and study location details. Please cite this study when using the data. Records of past climate and ocean circulation derived from marine sediments. Parameter keywords describe what was measured in this dataset. Additional summary information can be found in the abstracts of papers listed in the dataset citations. completed Bauer, Bruce DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce +1 303-497-6280 +1 303-497-6513 325 Broadway, E/CC23 Boulder CO 80305-3328 USA paleo@noaa.gov pointOfContact https://www.ncdc.noaa.gov/c/images/pc-default-ocean.png Paleoclimatology - Paleoceanography PNG Earth Science > Paleoclimate > Ocean/Lake Records Earth Science > Climate Indicators > Paleoclimate Indicators > Ocean/Lake Records theme Global Change Master Directory (GCMD) Science Keywords 2018 revision Version 8.6 Global Change Data Center, Science and Exploration Directorate, Goddard Space Flight Center (GSFC) National Aeronautics and Space Administration (NASA) https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords HTTPS Web Browser Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information publisher earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleocean > physical properties earth science > paleoclimate > paleocean > magnetic susceptibility theme Global Change Master Directory (GCMD) Science Keywords 2018 revision Version 8.6 Global Change Data Center, Science and Exploration Directorate, Goddard Space Flight Center (GSFC) National Aeronautics and Space Administration (NASA) https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords HTTPS Web Browser Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information publisher Arctic sea ice theme Ocean > Arctic Ocean > Chukchi Sea> HLY05-01 JPC5 > LATITUDE 72.694 > LONGITUDE -157.52 place otherRestrictions Cite as: Brachfeld, S.; Barletta, F.; St-Onge, G.; Darby, D.; Ortiz, J.D. (2010-12-31): NOAA/WDS Paleoclimatology - Chukchi Sea Holocene Rock Magnetic Data . [indicate subset used]. NOAA National Centers for Environmental Information. https://www.ncdc.noaa.gov/paleo/study/10313. Accessed [date]. otherRestrictions Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives. otherRestrictions Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose. otherRestrictions None otherRestrictions 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. eng; USA geoscientificInformation Date Range: 9330 cal yr BP to 1350 cal yr BP; -157.52 -157.52 72.694 72.694 Study Coordinates 72.694 -157.52 -7380 600 STUDY NOTES: The dataset consists of rock magnetic parameters, which are sensitive to sea ice cover, paleoproductivity, and post depositional diagenesis along the Chukchi-Alaska margin. Piston Core HLY05-01 JPC5 and its trigger core TC5 were collected from the eastern Chukchi Sea, North of Barrow, Alaska during cruise 05–01 of the USCGC Healy. The parameters include low-field magnetic susceptibility (X-LH), coercivity (Hc), saturation remanence (Mr), saturation magnetization (Ms), saturation remanence normalized by saturation magnetization (Mr/Ms), high-field magnetic susceptibility (Xhf), ferromagnetic susceptibility (Xf), coercivity of remanence (Hcr), coercivity of remanence normalized by coercivity (Hcr/Hc), S-ratio, saturation remanence normalized by low-field susceptibility (Mr/X), median destruction field of the natural remanent magnetization (MDF-NRM), anhysteretic remanent magnetization (ARM), median destructive field of the anhysteretic remanent magnetization (ARM-MDF), saturation isothermal remanent magnetization (SIRM), and anhysteretic remanent magnetization normalized by saturation isothermal remanent magnetization (ARM/SIRM). The parameters MDF-NRM, ARM, MDF-ARM, and SIRM were measured on U-channel subsamples on 2G-Enterprises Model 760R u-channel magnetometer at the University of Florida, Gainesville, FL. Low-field mass-normalized magnetic susceptibility (XLF) of dry samples was measured on an AGICO KLY-4 Kappabridge in an applied field of 300 A/m. Ferromagnetic susceptibility (XF) was calculated by subtracting the high-field slope (XHF) of the magnetization (M) vs. applied field (H) curve measured on a vibrating sample magnetometer from XLF. Magnetic hysteresis measurements were made on a Princeton Measurements Corp. micro-Vibrating Sample Magnetometer model 3900-04 at Montclair State University, NJ. Hysteresis loops were measured in a peak field of 1 T and field increments of 5 mT. Raw data were processed by using XHF, calculated from 0.7 to 1 T, to remove the paramagnetic contribution to the induced magnetization, and then normalized by dry mass. The hysteresis parameters saturation magnetization (Ms), saturation remanence (Mr) and coercivity (Hc) were determined from the paramagnetic- corrected data. The coercivity of remanence (Hcr) was determined through the DC-demagnetization of a saturation isothermal remanent magnetization imparted in a 1 T field. The S-ratio was measured by imparting a 1 T isothermal remanent magnetization, followed by the application of a 300 mT backfield, and calculating Mr(300mT)/MR(1T). A combination of 210Pb dating and Accelerator Mass Spectrometer (AMS) radiocarbon dating of calcareous shells was used to construct the depth-age model for TC5 and JPC5. ABSTRACT SUPPLIED BY ORIGINATOR: We present a high-resolution Holocene sedimentary record of environmental variability from the eastern Chukchi Sea. An ice-rafted debris bearing silty-clay marks the deglacial to post-glacial Holocene transition at this site and is dated at 9.7 ka. An interval of oscillating magnetic parameters from 9.5 to 8.7 ka coincides with the Holocene Thermal Maximum in the western Arctic, and is manifested at the study area as pulses of fine-grained magnetite input every 180-230 years, possibly from increased river discharge or stronger currents flowing over the core site. The magnetic mineral assemblage is very uniform over the last 8.2 ka and consists of a mixture of magnetite, titanomagnetite, and a magnetic phase that we tentatively identify as the magnetic iron sulfide greigite. The amount of magnetic iron sulfides increases up through the Holocene, a trend that is controlled by the amount of marine organic matter available to fuel bacterial sulfate reduction. The median destructive field of the Natural Remanent Magnetization (MDFNRM) displays centennial to millennial scale cycles with significant variance at periods of 900–1300 and 1700–2700 years, with intervals of high MDFNRM values coinciding with indicators of greater sea ice cover [McKay, J., de Vernal, A., Hillaire-Marcel, C., Not, C., Polyak, L., Darby, D., 2008. Holocene fluctuations in Arctic sea-ice cover: Dinocyst-based reconstructions for the eastern Chukchi Sea. Can. J. Earth Sci. 45, 1399–1415]. The MDFNRM is controlled by the variable abundance of iron sulfides formed during early diagenesis. We interpret intervals of high MDFNRM values as times of stronger water column stratification, during which the pyritization process was interrupted by the lack of marine organic matter and lack of reactive iron. Intervals of low MDFNRM values, which coincide with indicators of reduced sea ice cover, are interpreted as times of stronger vertical mixing of the water column, which allows fresh marine organic matter and reactive iron to reach the seafloor, driving the pyritization process to completion. DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce Customer Engagement Branch 1-828-271-4800 1-828-271-4876 151 Patton Avenue Veach-Baley Federal Building, Room 468 Asheville NC 28801-5001 USA ncei.orders@noaa.gov https://www.ncei.noaa.gov HTTPS Web Browser NOAA National Centers for Environmental Information (NCEI) NCEI home page with information, data access and contact information. information 8:00 - 6:00 Eastern distributor In most cases, electronic downloads of the data are free, however fees may apply for data certifications, copies of analog materials, and data distribution on physical media. Native Format(s) https://data.nodc.noaa.gov/cgi-bin/iso?id=noaa-ocean-10313 HTTPS Landing Page NCEI landing page for this dataset Dataset landing page with general information and links to access the data. information https://www.ncdc.noaa.gov/paleo/study/10313 HTTPS Web Browser NCEI Study Page Study page with dataset access information. search https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/paleoceanography HTTPS Information NCEI Paleoceanography Page General information for this data type. information https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/brachfeld2009/brachfeld2009.txt HTTPS Download /contributions_by_author/brachfeld2009/brachfeld2009.txt Original Data and Full Metadata download https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/brachfeld2009/brachfeld2009.xls HTTPS Download /contributions_by_author/brachfeld2009/brachfeld2009.xls Original Data and Full Metadata download asNeeded This metadata record was translated from DIF using dif-9x-to-iso-19115-2.xsl Version: 2018-10-25