noaa-ocean-8455 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 2024-01-19 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) NOAA/WDS Paleoclimatology - Southern Ocean Diatom-bound Nitrogen Isotope Data 2008-07-01 publication doi:10.25921/bgm2-y759 noaa-ocean-8455 NCEI DSI 1200_02 NCEI DSI 1200_01 Robinson, R.S. originator Robinson, R.S. author Sigman, D.M. originator Sigman, D.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 South Atlantic Ocean. The time period coverage is from Unavailable begin date to Unavailable end date 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 > 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 What: delta 15N; Material: diatom What: depth; Material: null 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 > Atlantic Ocean > South Atlantic Ocean > RC13-259 > LATITUDE -53.88 > LONGITUDE -4.93 Ocean > Southern Ocean > NBP9802-06PC > LATITUDE -61.88 > LONGITUDE -169.98 Ocean > Southern Ocean > NBP9802-05GC > LATITUDE -63.11 > LONGITUDE -169.74 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: Robinson, R.S.; Sigman, D.M. (2008-07-01): NOAA/WDS Paleoclimatology - Southern Ocean Diatom-bound Nitrogen Isotope Data. [indicate subset used]. NOAA National Centers for Environmental Information. https://doi.org/10.25921/bgm2-y759. 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. Nitrogen isotopic evidence for a poleward decrease in surface nitrate within the ice age Antarctic 2008 publication Robinson, R.S. and D.M. Sigman author Quaternary Science Reviews publisher https://doi.org/10.1016/j.quascirev.2008.02.005 HTTPS Web Browser Associated Reference published 2008 Robinson, R.S. and D.M. Sigman, 2008: Nitrogen isotopic evidence for a poleward decrease in surface nitrate within the ice age Antarctic. Quaternary Science Reviews, 27, 1076-1090, 10.1016/j.quascirev.2008.02.005 information crossReference sciencePaper eng; USA geoscientificInformation Paleo date information not available. -169.98 -4.93 -63.11 -53.88 1950 ABSTRACT SUPPLIED BY ORIGINATOR: Surface sediment diatom-bound δ15N along a latitudinal transect of 170°W shows a previously unobserved increase to the South of the Antarctic Polar Front. The southward δ15N increase is best explained by the combination of two changes toward the South, a decrease in the isotope effect of nitrate assimilation (ε) and an increase in the degree of nitrate consumption, both associated with shoaling of the mixed layer into the seasonal ice zone (SIZ). New downcore records show high amplitude changes in diatom-bound δ15N during the last ice age, with intervals of higher δ15N, including the last glacial maximum, the transition between marine isotope stages 5 and 4, and marine isotope stage 6, while other intervals are similar in δ15N to interglacial sediments. Variation in the range of 0–3‰, as seen in previously published records, may be entirely due to changes in ε. However, the observed magnitude of the change of 4–10‰ in the three new records and the locations of these records relative to the modern meridional gradient in mixed layer depth appear to require increased nitrate consumption to explain the high-δ15N intervals. The new sites are near the modern Southern Antarctic Circumpolar Current Front (SACCF), and one of the sites has been shown to be associated with sporadic summer sea ice during the LGM. As with other Antarctic sites, the available proxy data suggest that they were characterized by lower export production. Based on these and other observations, we propose that the weak southward nitrate decrease in the modern Antarctic surface was a fully developed “nutrient front” in the glacial Antarctic, associated with the SACCF. Both modern ocean and paleoceanographic work is needed to test this hypothesis, which would have major implications for atmospheric CO2. 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/bgm2-y759 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/8455 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/contributions_by_author/robinson2008/ HTTPS Download /contributions_by_author/robinson2008/ Data Folder download asNeeded This ISO metadata record was translated from DIF metadata using dif-9x-to-iso-19115-2.xsl Version: 2022-06-21