noaa-ocean-12335 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 - Northwest Pacific RC10-196 Deglacial Biogenic Flux Data 2011-12-14 publication noaa-ocean-12335 NCEI DSI 1200_01 Kohfeld, K.E. originator Kohfeld, K.E. author Chase, Z. originator Chase, Z. 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 North Pacific Ocean. The time period coverage is from 92880 to 9232 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 > paleoceanography earth science > paleoclimate > paleocean > geochemistry earth science > paleoclimate > paleocean > oxygen isotopes 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 biogeochemical cycles theme Ocean > Pacific Ocean > North Pacific Ocean> RC10-196 > LATITUDE 54.7 > LONGITUDE 177.1 place otherRestrictions Cite as: Kohfeld, K.E.; Chase, Z. (2011-12-14): NOAA/WDS Paleoclimatology - Northwest Pacific RC10-196 Deglacial Biogenic Flux Data . [indicate subset used]. NOAA National Centers for Environmental Information. https://www.ncdc.noaa.gov/paleo/study/12335. 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: 92880 cal yr BP to 9232 cal yr BP; 177.1 177.1 54.7 54.7 Study Coordinates 54.7 177.1 -90930 -7282 STUDY NOTES: We present 230Th-normalized biogenic fluxes from an intermediate depth sediment core in the Northwest Pacific (RC10-196) and place them within the context of a synthesis of previously-published biogenic flux data from 49 deep-sea cores north of 20ºN, ranging from 420 to 3968 m water depth. The 230Th normalized opal, carbonate, and organic carbon fluxes from RC10-196 peak approximately 13,000 calendar years BP during the Bølling/Allerød (B/A) period. This file includes: (a) radiocarbon data from N. pachyderma (s), (b) oxygen and carbon isotope data on N. pachyderma (s), (c) wt% and mass accumulation rates of opal, carbonate, organic carbon, and authigenic Uranium, and (d) associated 230Th data. Note that MARtoc, MARcaco3, and MARopal (mg/cm2/y) are not 230Th fluxes, but are estimated as: MAR = f * LSR * DBD (where DBD = dry bulk density; LSR = linear sedimentation rate; f = measured fraction of TOC, CaCO3, and opal, respectively.) Methods: 230Th-normalization was used to reconstruct particle flux to an intermediate depth sediment core, RC10-196. An age model was determined using a combination of radiocarbon dates and oxygen isotope stratigraphy. Oxygen isotope values were measured on N. pachyderma (sinistral coiling) from the 150-250 um size fraction at the Saskatchewan Isotope Laboratory at the University of Saskatchewan. Radiocarbon analysis was conducted on three samples (two of N. pachyderma (sinistral coiling), one of mixed planktonic foraminifera), at Lawrence Livermore National Laboratory. These dates were converted to calendar age using the CALIB program (Stuiver and Reimer, 1993 (version 6.0)). Prior to calibration, a reservoir correction of 450 years was applied, using estimates obtained by Sarnthein et al. (2007) on cores from the NW Pacific region. Using this age model, sedimentation rates at RC10-196 ranged from 4.2 to 5.9 cm/ka over the last 30,000 years. Samples for U-series measurement were spiked with yield tracers (229Th and 236U), digested in HCl, HF, HNO3 and perchloric acid (Fleisher and Anderson, 1991) and pre-concentration by anion exchange resin (Chase et al., 2003). Isotope spikes were calibrated against a natural U standard (CRM-145) and a natural Th standard (NIST 3159). Digests were analyzed by isotope dilution HR-ICP-MS (Axiom) at Oregon State University (Chase et al., 2003; Fleisher and Anderson, 2003). Mass bias was assessed by repeated analysis of CRM-145. Propagated uncertainties for individual analyses were ~ 4% for 230Th concentration while repeated digestion and analysis of an in-house sediment standard was reproducible to 6%. Excess 230Th and authigenic U were calculated from the sediment concentration data assuming a detrital U/Th ratio of 0.7 ± 0.1 (Henderson and Anderson, 2003). Thorium concentrations measured in the GEOTRACES intercalibration sediment sample were in agreement with the main distribution of the submitted data (Anderson et al., submitted manuscript). ABSTRACT SUPPLIED BY ORIGINATOR: The subarctic North Pacific Ocean holds a large CO2 reservoir that is currently isolated from the atmosphere by a low-salinity layer. It has recently been hypothesized that the reorganization of these high-CO2 waters may have played a crucial role in the degassing of carbon dioxide to the atmosphere during the last deglaciation. This reorganization would leave some imprint on paleo-productivity records. Here we present 230Th-normalized biogenic fluxes from an intermediate depth sediment core in the Northwest Pacific (RC10-196, 54.7°N, 177.1°E, 1007 m) and place them within the context of a synthesis of previously-published biogenic flux data from 49 deep-sea cores north of 20°N, ranging from 420 to 3968 m water depth. The 230Th-normalized opal, carbonate, and organic carbon fluxes from RC10-196 peak approximately 13,000 calendar years BP during the Bølling/Allerød (B/A) period. Our data synthesis suggests that biogenic fluxes were in general lowest during the last glacial period, increased somewhat in the Northwest Pacific during Heinrich Event 1, and reached a maximum across the entire North Pacific during the B/A period. We evaluate several mechanisms as possible drivers of deglacial change in biogenic fluxes in the North Pacific, including changes in preservation, sediment focusing, sea ice extent, iron inputs, stratification, and circulation shifts initiated in the North Atlantic and North Pacific. Our analysis suggests that while micronutrient sources likely contributed to some of the observed changes, the heterogeneity in timing of glaciogenic retreat and sea level make these mechanisms unlikely causes of region-wide contemporaneous peaks in export production. We argue that paleo-observations are most consistent with ventilation increases in both the North Pacific (during H1) and North Atlantic (during B/A) being the primary drivers of increases in biogenic flux during the deglaciation, as respectively they were likely to bring nutrients to the surface via increased vertical mixing and shoaling of the global thermocline. 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Native Format(s) https://data.nodc.noaa.gov/cgi-bin/iso?id=noaa-ocean-12335 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/12335 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/kohfeld2011/kohfeld2011.txt HTTPS Download /contributions_by_author/kohfeld2011/kohfeld2011.txt Original Data and Full Metadata download https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/kohfeld2011/kohfeld2011.xls HTTPS Download /contributions_by_author/kohfeld2011/kohfeld2011.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