{"NOAAStudyId":"13180","contactInfo":{"address":"325 Broadway, E/NE31","city":"Boulder","constraints":"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.","country":"USA","dataCenterUrl":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data","email":"paleo@noaa.gov","fax":"303-497-6513","longName":"National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce ","phone":"303-497-6280","postalCode":"80305-3328","shortName":"DOC/NOAA/NESDIS/NCEI","state":"CO","type":"CONTACT INFORMATION"},"contributionDate":"2012-08-01","dataPublisher":"NOAA","dataType":"PALEOCEANOGRAPHY","dataTypeInformation":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/paleoceanography","difMetadataLink":"http://www1.ncdc.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-ocean-13180.xml","doi":null,"earliestYearBP":17394,"earliestYearCE":-15444,"entryId":"noaa-ocean-13180","funding":[{"fundingAgency":"US National Science Foundation","fundingGrant":null},{"fundingAgency":"US NOAA","fundingGrant":null},{"fundingAgency":"US Geological Survey","fundingGrant":null}],"investigators":"Addison, J.A.; Finney, B.P.; Dean, W.E.; Davies, M.H.; Mix, A.C.; Stoner, J.S.; Jaeger, J.M.","mostRecentYearBP":1085,"mostRecentYearCE":865,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/13180","originalSource":null,"publication":[{"abstract":"Biogenic opal, organic carbon, organic matter stable isotope, \r\nand trace metal data from a well-dated, high-resolution jumbo \r\npiston core (EW0408-85JC; 59°33.3'N, 144°9.21'W, 682 m water depth) \r\nrecovered from the northern Gulf of Alaska continental slope reveal \r\nchanges in productivity and nutrient utilization over the last \r\n17,000 years. Maximum values of opal concentration (~10%) occur \r\nduring the deglacial Bølling-Allerød (B-A) interval and earliest \r\nHolocene (11.2 to 10.8 cal ka BP), moderate values (~6%) occur \r\nduring the Younger Dryas (13.0 to 11.2 cal ka BP) and Holocene, \r\nand minimum values (~3.5%) occur during the Late Glacial Interval \r\n(LGI). When converted to opal mass accumulation rates, the highest \r\nvalues (~5000 g cm-2 kyr-1) occur during the LGI prior to 16.7 \r\ncal ka BP, which points to a strong influence by LGI glaciomarine \r\nsedimentation regimes. Similar patterns are also observed in total \r\norganic carbon and cadmium paleoproductivity proxies. Mid-Holocene \r\npeaks in the terrestrial organic matter fraction at 5.5, 4.7, 3.5, \r\nand 1.2 cal ka BP indicate periods of enhanced delivery of glaciomarine \r\nsediments by the Alaska Coastal Current. The B-A and earliest Holocene \r\nintervals are laminated, and enrichments of redox-sensitive elements \r\nsuggest dysoxic-to-anoxic conditions in the water column. \r\nThe laminations are also associated with mildly enriched sedimentary \r\nd15N ratios, indicating a link between productivity, nitrogen cycle \r\ndynamics, and sedimentary anoxia. After applying a correction for \r\nterrestrial d15N contributions based on end-member mixing models \r\nof terrestrial and marine organic matter, the resulting B-A marine \r\nd15N (6.3 ± 0.4 ‰) ratios are consistent with either mild \r\ndenitrification, or increased nitrate utilization. These findings \r\ncan be explained by increased micronutrient (Fe) availability during \r\nepisodes of rapid rising sea level that released iron from the \r\npreviously subaerial coastal plain; iron input from enhanced \r\nterrestrial runoff; and/or the intermittent presence of seasonal \r\nsea ice resulting from altered ocean/atmospheric circulation \r\nduring the B-A in the Gulf of Alaska. \r\n","author":null,"citation":"Addison, J.A., B.P. Finney, W.E. Dean, M.H. Davies, A.C. Mix, \r\nJ.S. Stoner, and J.M. Jaeger. 2012. \r\nProductivity and sedimentary d15N variability for the last 17,000 \r\nyears along the northern Gulf of Alaska continental slope. \r\nPaleoceanography, Vol. 27, PA1206, doi:10.1029/2011PA002161. ","edition":null,"identifier":{"id":"10.1029/2011PA002161","type":"doi","url":"http://dx.doi.org/10.1029/2011PA002161"},"issue":null,"journal":"Paleoceanography","pages":null,"pubRank":"1","pubYear":2012,"reportNumber":null,"title":"Productivity and sedimentary d15N variability for the last 17,000  years along the northern Gulf of Alaska continental slope","type":"publication","volume":null}],"reconstruction":"N","scienceKeywords":["Younger Dryas"],"site":[{"NOAASiteId":"53252","geo":{"geoType":"Feature","geometry":{"coordinates":["59.555","-144.1535"],"type":"POINT"},"properties":{"easternmostLongitude":"-144.1535","maxElevationMeters":"-682","minElevationMeters":"-682","northernmostLatitude":"59.555","southernmostLatitude":"59.555","westernmostLongitude":"-144.1535"}},"locationName":"Ocean>Pacific Ocean>North Pacific Ocean>Gulf Of Alaska","mappable":"Y","paleoData":[{"NOAADataTableId":"22663","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth 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molecule>cadmium"},{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":"elemental analysis","cvSeasonality":null,"cvShortName":null,"cvUnit":"weight percent","cvWhat":"chemical composition>element or single-element molecule>nitrogen"}]},{"NOAAKeywords":["earth science>paleoclimate>paleocean>geochemistry","earth science>paleoclimate>paleocean>carbon isotopes","earth science>paleoclimate>paleocean>nitrogen isotopes"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/addison2012/addison2012.xls","linkText":"addison2012.xls","urlDescription":"Original Data and Full Metadata","variables":[]}],"dataTableName":"EW0408-85JC","dataTableNotes":null,"earliestYear":17394,"earliestYearBP":17394,"earliestYearCE":-15444,"mostRecentYear":1085,"mostRecentYearBP":1085,"mostRecentYearCE":865,"species":[],"timeUnit":"cal yr BP"}],"siteName":"EW0408-85JC"}],"studyCode":null,"studyName":"Gulf of Alaska 17,000 Year Paleoproductivity Data","studyNotes":"Multiproxy sediment paleoproductivity data from a jumbo piston \ncore collected on the northern Gulf of Alaska continental slope. \nProxy data measured include biogenic opal, organic carbon, \norganic matter stable isotopes, and trace metal data. \n\nThese organic and inorganic geochemical data are from the northern \ncontinental slope of the Gulf of Alaska, and span from 1.1 to 17.4 \ncalibrated kyrs ago.  This marine sediment record is continuous \nand well-dated by 37 AMS radiocarbon dates on planktonic foraminifera \n(see Davies et al., 2011 for further information). \n\nOpal was measured by a 0.1 M NaCO3 extraction and a molybdate-blue \nspectrophotometric method (Mortlock and Froehlich, 1989). \nTotal organic carbon (TOC) and total nitrogen (TN) were measured \non a carbonate-free subsample by combustion in a Costech 4010 HCNS \nelemental analyzer.  Organic matter d13C and sedimentary d15N were \nmeasured on a carbonate-free subsample using a Finnigan Delta-plus XP \nisotope ratio mass spectrometer.  CaCO3 data is a combination of total \nCa measured by ICP-OES (n = 110), calibrated with a smaller number \nof CaCO3 coulometric measurements (n = 43).  Inorganic element \nconcentrations (Al, Mn, Co, Cr, U, Mo, and Cd) were measured by \na combination of ICP-OES and ICP-MS at SGS Minerals Services \nin Toronto, Canada. \n\nA terrestrial-N-corrected dataset of sedimentary d15N is also included. \nThis data reflects the application of a linear endmember mixing model \nbetween terrestrial and marine organic matter to remove the influence \nof terrestrial N from the bulk sedimentary d15N measurements. \nThese data should be considered on a qualitative basis only. \nPlease see Addison et al. (2012) or contact the author directly \nfor further information. \n\nCore EW0408-85JC: 59°33.3'N, 144°9.21'W, 682 m water depth \n","version":"1.0","xmlId":"11223"}