{"NOAAStudyId":"14791","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":"2013-08-19","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-14791.xml","doi":null,"earliestYearBP":23502,"earliestYearCE":-21552,"entryId":"noaa-ocean-14791","funding":[],"investigators":"Lam, P.J.; Robinson, L.F.; Blusztajn, J.; Li, C.; Cook, M.S.; McManus, J.F.; Keigwin, L.D.","mostRecentYearBP":2849,"mostRecentYearCE":-899,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/14791","originalSource":null,"publication":[{"abstract":"During the Bølling–Allerød warm period of the last deglaciation, about 14 kyr ago, there was a strong and pervasive spike in primary productivity in the North Pacific Ocean1. It has been suggested that this productivity event was caused by an influx of the micronutrient iron from surrounding continental shelves as they were flooded by sea-level rise2. Here we test this hypothesis by comparing numerous proxies of productivity with iron flux and provenance measured from a core from the subarctic Pacific Ocean. We find no evidence for an abrupt deglacial pulse of iron from any source at the time of peak productivity. Instead, we argue that the deglacial productivity peak was caused by two stepwise events. First, deep convection during early deglaciation increased nutrient supply to the surface but also increased the depth of the mixed layer, which pushed surface production deeper in the water column and induced light limitation. A subsequent input of meltwater from northern American ice sheets then stratified the water column, which relieved light limitation while leaving the surface waters enriched in nutrients. We conclude that iron plays, at most, a secondary role in controlling productivity during the glacial and deglacial periods in the subarctic Pacific Ocean.","author":null,"citation":"Lam, P.J., L.F. Robinson, J. Blusztajn, C. Li, M.S. Cook, J.F. McManus and L.D. Keigwin. 2013. Transient stratification as the cause of the North Pacific productivity spike during deglaciation. Nature Geoscience, 6, 622-626. DOI: 10.1038/ngeo1873","edition":null,"identifier":{"id":"10.1038/ngeo1873","type":"doi","url":"http://dx.doi.org/10.1038/ngeo1873"},"issue":null,"journal":"Nature Geoscience","pages":null,"pubRank":"1","pubYear":2013,"reportNumber":null,"title":"Transient stratification as the cause of the North Pacific productivity spike during deglaciation","type":"publication","volume":null}],"reconstruction":"N","scienceKeywords":null,"site":[{"NOAASiteId":"55251","geo":{"geoType":"Feature","geometry":{"coordinates":["50.42","167.731667"],"type":"POINT"},"properties":{"easternmostLongitude":"167.731667","maxElevationMeters":"-3300","minElevationMeters":"-3300","northernmostLatitude":"50.42","southernmostLatitude":"50.42","westernmostLongitude":"167.731667"}},"locationName":"Ocean>Pacific Ocean>North Pacific Ocean","mappable":"Y","paleoData":[{"NOAADataTableId":"24900","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleocean>oxygen isotopes"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lam2013/lam2013-ggc37-foram.txt","linkText":"lam2013-ggc37-foram.txt","urlDescription":"Original Data and Full Metadata","variables":[{"cvAdditionalInfo":"working half of GGC37","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"centimeter","cvWhat":"depth variable>depth"},{"cvAdditionalInfo":"archive half of GGC37","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"centimeter","cvWhat":"depth variable>depth"},{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"calendar kiloyear before present","cvWhat":"age variable>age"},{"cvAdditionalInfo":"Uvigerina auberiana","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"count per gram","cvWhat":"biological material>organism>foraminifer>identified foraminifer"},{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"biological material>organism>foraminifer>planktic foraminifer>Neogloboquadrina sp.>Neogloboquadrina pachyderma>Neogloboquadrina pachyderma sinistral","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil PDB","cvWhat":"chemical composition>isotope>isotope ratio>delta 18O"},{"cvAdditionalInfo":null,"cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"biological material>organism>foraminifer>benthic foraminifer>calcareous benthic foraminifer>Cibicidoides sp.","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil PDB","cvWhat":"chemical composition>isotope>isotope ratio>delta 18O"}]}],"dataTableName":"GGC37 Lam13 Foram","dataTableNotes":"Previously published d18O and benthic foraminiferal abundance measurements (Keigwin '98) were made on subsamples taken from the working half of core GGC-37.  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