noaa-ocean-39460 eng; USA utf8 dataset NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact NCEI Contact Information Information for contacts at NCEI. information pointOfContact NOAA World Data Service for Paleoclimatology Data Center Contact 828-271-4800 303-497-6513 325 Broadway, E/NE31 Boulder CO 80305-3328 USA paleo@noaa.gov pointOfContact 2025-04-18 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) NOAA/WDS Paleoclimatology - Western Equatorial Pacific Ocean IODP Site U1486 Bulk d15N and Age Model Data from 1421 ka to 0.67 ka 2024-05-15 publication doi:10.25921/123n-3517 noaa-ocean-39460 NCEI DSI 1200_02 NCEI DSI 1200_01 Lambert, J.E. originator Lambert, J.E. author Gibson, K.A. originator Gibson, K.A. author Linsley, B.K. originator Linsley, B.K. author Bova, S.C. originator Bova, S.C. author Rosenthal, Y. originator Rosenthal, Y. author Surprenant, M. originator Surprenant, M. 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 Western Pacific Ocean. The time period coverage is from 1421560 to 670 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 NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact NCEI Contact Information Information for contacts at NCEI. information pointOfContact NOAA World Data Service for Paleoclimatology Data Center Contact 828-271-4800 303-497-6513 325 Broadway, E/NE31 Boulder CO 80305-3328 USA paleo@noaa.gov pointOfContact https://www.ncei.noaa.gov/pub/data/paleo/webimages/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 2025 revision 22 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 22. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleocean > nitrogen isotopes theme Global Change Master Directory (GCMD) Science Keywords 2025 revision 22 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 22. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian Atmospheric and Oceanic Circulation Patterns Reconstruction Glacial Interglacial Warm Pool biogeochemical cycles carbon cycle trends theme What: age; Material: null What: nitrogen; Material: dry sediment What: delta 15N; Material: dry sediment theme Paleoenvironmental Standard Terms (PaST) Thesaurus NOAA National Centers for Environmental Information https://www.ncei.noaa.gov/products/paleoclimatology/paleoenvironmental-standard-terms-thesaurus PaST Thesaurus information publisher Ocean > Pacific Ocean > Western Pacific Ocean > IODP U1486 > LATITUDE -2.372 > LONGITUDE 144.6 place DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce dataCentre Global Change Master Directory (GCMD) Data Center Keywords 2025 revision 22 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 22. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian otherRestrictions Cite as: Lambert, J.E.; Gibson, K.A.; Linsley, B.K.; Bova, S.C.; Rosenthal, Y.; Surprenant, M. (2024-05-15): NOAA/WDS Paleoclimatology - Western Equatorial Pacific Ocean IODP Site U1486 Bulk d15N and Age Model Data from 1421 ka to 0.67 ka. [indicate subset used]. NOAA National Centers for Environmental Information. https://doi.org/10.25921/123n-3517. 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. 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Equatorial Pacific bulk sediment d15N supports a secular increase in Southern Ocean nitrate utilization after the mid-Pleistocene Transition 2022 publication Lambert, Jonathan E; Gibson, Kelly A; Linsley, Braddock K.; Bova, Samantha, C.; Rosenthal, Y; Surprenant, M. author Quaternary Science Reviews publisher https://doi.org/10.1016/j.quascirev.2021.107348 HTTPS Web Browser Associated Reference published 2022 Lambert, Jonathan E; Gibson, Kelly A; Linsley, Braddock K.; Bova, Samantha, C.; Rosenthal, Y; Surprenant, M., 2022: Equatorial Pacific bulk sediment d15N supports a secular increase in Southern Ocean nitrate utilization after the mid-Pleistocene Transition. Quaternary Science Reviews, 278, , 10.1016/j.quascirev.2021.107348 information crossReference sciencePaper eng; USA geoscientificInformation Date Range: 1421560 cal yr BP to 670 cal yr BP; 144.6 144.6 -2.372 -2.372 Study Coordinates -2.372 144.6 -1419610 1280 STUDY NOTES: Millenial to orbital-scale resolution bulk sediment nitrogen isotope data from Site U1486 from the early Pleistocene to Holocene Provided Keywords: Western Pacific Warm Pool, Equatorial Pacific, nitrogen isotopes, IODP, U1486 ABSTRACT SUPPLIED BY ORIGINATOR: In much of the equatorial Pacific, surface nitrate is consistently available due to upwelling of sub-Antarctic Mode Water-derived nitrate from the thermocline. However, in the low-latitude western boundary current (WBC) region, surface nitrate is limited due to reduced upwelling and less nitrate-replete thermocline water masses. In order to explore South Pacific WBC paleoceanography via upper ocean nitrate dynamics, we present a new bulk sediment d15N record from within this WBC region at International Ocean Discovery Program Site U1486 (2°22'S, 144°36'E) in the Bismarck Sea north of New Guinea. This record spans from 1420 ka to recent – surpassing nearby sediment d15N reconstructions by over a million years and allowing for direct comparison to low-latitude Pacific sediment core d15N records of similar length. Core-top and down-core bulk sediment d15N, TOC/TN and d13Corg values indicate minimal or no terrestrial influence on the organic fraction at Site U1486, which is consistent with previous studies of modern processes in the region. After comparison, differences in orbital variability and secular trends throughout the Middle and Late Pleistocene suggest that nitrate dynamics along the equator and in the WBCs were relatively disparate. We observe that d15N at Site U1486 is consistent with patterns of eastern Pacific denitrification, while we suggest increasing d15N after the mid-Pleistocene Transition (MPT; ~1250–700 ka) at Sites 806 (0°19'N, 110°30'W) and 849 (0°19'N, 160°E) is linked to increasing Southern Ocean nitrate utilization. Enhanced nitrate utilization is a key indicator of the strengthened biological pump that contributed to a reduction in atmospheric pCO2 during the last glacial. Therefore, a post-MPT increase in nitrate utilization may bolster the role of the Southern Ocean biological pump in driving the deeper and longer glacial periods of the 100-kyr world. NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact NCEI Contact Information Information for contacts at NCEI. information distributor In most cases, electronic downloads of the data are free. However, fees may apply for custom orders, data certifications, copies of analog materials, and data distribution on physical media. Contact NCEI for other distribution options and instructions. Native Format(s) https://doi.org/10.25921/123n-3517 HTTPS Landing Page Metadata Landing Page NCEI landing page with general information and links to access the data. information https://www.ncei.noaa.gov/access/paleo-search/study/39460 HTTPS Web Browser NOAA Study Page Study page with data access information. search https://www.ncei.noaa.gov/products/paleoclimatology/paleoceanography HTTPS Information NCEI Paleoceanography Page General information for this data type. information https://www.ncei.noaa.gov/pub/data/paleo/paleocean/pacific/lambert2022/lambert2022-u1486-d15n.txt HTTPS Download NCEI Direct Download Direct download links for dataset files. download asNeeded This ISO metadata record was translated from DIF metadata using dif-9x-to-iso-19115-2.xsl Version: 2022-06-21