# South Atlantic TN057-13PC 30 KYr Nitrogen Data #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # Template Version 4.0 # Encoding: UTF-8 # NOTE: Please cite original publication, NOAA Landing Page URL, dataset and publication DOIs (where available), # and date accessed when using these downloaded data. If there is no publication information, please cite investigator, study title, NOAA Landing Page URL, and date accessed. # # NOAA_Landing_Page: https://www.ncei.noaa.gov/access/paleo-search/study/13545 # Landing_Page_Description: NOAA Landing Page of this file's parent study, which includes all study metadata. # # Study_Level_JSON_Metadata: https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/json/noaa-ocean-13545.json # Study_Level_JSON_Description: JSON metadata of this file's parent study, which includes all study metadata. # # Data_Type: Paleoceanography # # Dataset_DOI: 10.25921/cfmn-t223 # # Science_Keywords: biogeochemical cycles #-------------------- # Resource_Links # # Data_Download_Resource: https://www.ncei.noaa.gov/pub/data/paleo/contributions_by_author/horn2011/horn2011-noaa.txt # Data_Download_Description: NOAA Template File; Nitrogen Data # # Original_Source_URL: # Original_Source_Description: # #-------------------- # Contribution_Date # Date: 2012-12-03 #-------------------- # File_Last_Modified_Date # Date: 2022-09-21 #-------------------- # Title # Study_Name: South Atlantic TN057-13PC 30 KYr Nitrogen Data #-------------------- # Investigators # Investigators: Horn, M.G.S.; Beucher, C.P.; Robinson, R.S.(https://orcid.org/0000-0002-8072-1603); Brzezinski, M.A.(https://orcid.org/0000-0003-3432-2297) #-------------------- # Description_Notes_and_Keywords # Description: Bulk sedimentary and diatom-bound N isotope values for South Atlantic core TN057-13PC spanning the last 30 ky, based on previously published ages. Bulk d15N was measured by EA-IRMS. Diatom-bound d15N was measured after physical and chemical cleaning of the diatom-opal by the persulfate-denitrifier method. # For Chronology: See Anderson et al. 2009, Science, Vol. 323, pp. 1443, 13 March 2009. DOI: 10.1126/science.1167441; http://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/anderson2009/anderson2009.txt #-------------------- # Publication # Authors: Horn, M.G., C.P. Beucher, R.S. Robinson, M.A. Brzezinski # Journal_Name: Earth and Planetary Science Letters # Published_Title: Southern ocean nitrogen and silicon dynamics during the last deglaciation # Published_Date_or_Year: 2011 # Volume: 310 # Pages: 334-339 # Issue: 3-4 # Report_Number: # DOI: 10.1016/j.epsl.2011.08.016 # Full_Citation: # Abstract: The reinvigoration of overturning in the Southern Ocean is hypothesized to have returned CO2 from the deep ocean to the atmosphere at the end of the last ice age. Large peaks in opal accumulation have been put forward as evidence for an increase in wind driven upwelling between 10 and 15 ka. Here, we use coupled nitrogen and silicon isotope records alongside opal accumulation rates to provide quasi-quantitative estimates of Southern Ocean nutrient supply, by upwelling, and nutrient utilization across this interval. Significant changes in the consumption of N and Si across the two opal accumulation peaks indicate major changes in both upwelling and nutrient demand. We find N and Si consumption to be relatively incomplete during peak opal accumulation at the onset of the deglaciation. This indicates that nutrient supply was significantly enhanced. The second deglacial peak in opal accumulation is associated with more complete Si consumption and variable N consumption. We suggest that this peak represents strong upwelling and more complete utilization of the available silicic acid pool. Differences between the Si and N responses during opal peaks may stem from decreasing iron availability across the glacial termination. The nutrient isotope evidence for excess nutrients during the deglaciation indicates that the high export productivity was insufficient to overcome the evasion of CO2 to the atmosphere as a result of physical circulation changes. Previous work has demonstrated that the reinvigoration of overturning circulation during the deglaciation causes a transient peak in nutrient supply to the low latitudes. This is supported by our data, which indicate that relatively high macronutrient concentrations were maintained in the Southern Ocean surface waters that are incorporated into mode waters despite high demand. #-------------------- # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant_Number: OCE 00752191 #-------------------- # Site_Information # Site_Name: TN057-13PC4 # Location: Southern Ocean # Northernmost_Latitude: -53.1728 # Southernmost_Latitude: -53.1728 # Easternmost_Longitude: 5.1275 # Westernmost_Longitude: 5.1275 # Elevation: -2848 #-------------------- # Data_Collection # Collection_Name: TN057-13PC4Horn2011 # First_Year: 29320 # Last_Year: 0 # Time_Unit: cal yr BP # Core_Length: .904 # Parameter_Keywords: nitrogen isotopes # Notes: #-------------------- # Chronology_Information # Chronology: # # See Anderson et al. 2009, Science, Vol. 323, pp. 1443, 13 March 2009. DOI: 10.1126/science.1167441 # http://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/anderson2009/anderson2009.txt # #------------------ # Variables # # PaST_Thesaurus_Download_Resource: https://www.ncdc.noaa.gov/paleo/skos/past-thesaurus.rdf # PaST_Thesaurus_Download_Description: Paleoenvironmental Standard Terms (PaST) Thesaurus terms, definitions, and relationships in SKOS format. # # variables format: shortname what,material,error,units,seasonality,data_type,detail,method, C(har) or N(umeric) data,additional information # ## depth_cm depth,,,centimeter,,paleoceanography,,,N, ## age_calKaBP age,,,calendar kiloyear before present,,paleoceanography,,,N, ## Nconc-opal nitrogen,diatom,,micromole per gram,,paleoceanography,,,N,diatom-bound nitrogen ## d15Ndiatom delta 15N,diatom,,per mil,,paleoceanography,,,N,diatom-bound organic matter ## d15N delta 15N,sediment,,per mil,,paleoceanography,,,N, ## Nconc nitrogen,sediment,,micromole per gram,,paleoceanography,,,N, #-------------------- # Data: # Missing_Values: NA depth_cm age_calKaBP Nconc-opal d15Ndiatom d15N Nconc 0 0.00 12.61 10.49 4.38 30.67 26 0.81 13.00 9.35 4.46 27.63 50 1.28 12.76 10.06 4.65 27.93 75 1.86 12.94 10.06 5.74 27.79 97 2.47 12.80 10.04 5.11 28.17 125 3.24 10.76 9.87 5.46 27.45 152 3.98 12.06 10.10 5.29 29.69 173 4.56 13.60 10.16 6.06 31.24 202 5.36 14.09 10.14 5.60 30.20 225 5.99 16.18 10.05 4.35 36.19 252 6.73 10.45 10.32 4.35 33.66 276 7.12 11.59 9.88 4.60 39.57 305 7.53 12.50 9.99 4.92 36.44 329 7.86 12.72 10.34 4.81 35.22 344 8.07 11.34 10.10 5.27 32.78 372 8.46 11.58 10.18 5.21 32.53 398 8.83 12.73 10.73 4.39 31.35 424 9.19 13.72 9.84 4.46 31.41 448 9.52 14.81 9.61 4.91 30.07 471 9.54 12.94 10.29 4.74 30.88 494 9.85 13.60 10.76 4.96 22.32 512 10.11 14.24 10.15 4.44 25.96 533 10.40 4.23 32.30 552 10.74 12.74 10.67 4.24 23.64 572 11.12 15.53 9.96 4.94 25.84 590 11.46 12.29 10.55 4.42 19.87 608 11.80 14.01 9.07 4.70 19.89 628 12.18 14.46 10.13 4.39 22.44 648 12.56 17.83 9.85 5.08 25.42 668 12.94 16.87 9.80 5.04 30.15 691 13.37 17.41 8.73 4.23 29.07 711 13.74 16.01 9.81 4.83 31.15 721 13.93 16.98 9.29 5.01 33.69 730 14.10 15.66 9.81 4.74 29.72 743 14.50 18.59 9.32 4.88 29.34 748 14.95 19.09 9.56 4.55 28.02 754 15.50 18.46 9.72 4.21 34.51 759 15.97 20.09 8.61 4.27 35.22 763 16.33 19.08 9.36 4.93 34.79 770 16.98 14.89 9.79 5.47 38.56 775 17.44 16.12 11.00 5.23 41.13 780 17.90 14.54 10.81 6.28 42.30 785 18.36 13.67 10.88 4.74 42.89 789 18.73 14.05 10.97 5.30 47.74 794 19.19 14.89 10.29 4.95 55.33 802 19.92 13.97 10.01 5.32 47.97 812 20.85 12.82 9.27 5.79 37.14 824 21.95 11.71 9.25 5.02 34.56 835 22.97 12.46 4.85 35.86 846 23.98 13.52 8.95 4.85 29.96 855 24.81 14.00 8.95 4.62 33.55 865 25.73 14.42 8.97 5.20 34.45 875 26.65 14.99 9.37 4.53 35.27 886 27.66 13.79 9.69 4.92 37.54 895 28.49 15.41 8.06 4.30 41.58 904 29.32 17.80 8.21 3.86 40.43