# Deep Pacific 22,000 Year D14C Data and Projection Ventilation Ages #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program # National Centers for Environmental Information (NCEI) #----------------------------------------------------------------------- # Template Version 3.0 # Encoding: UTF-8 # NOTE: Please cite Publication, and Online_Resource and date accessed when using these data. # If there is no publication information, please cite Investigators, Title, and Online_Resource and date accessed. # # Online_Resource: https://www.ncdc.noaa.gov/paleo/study/25110 # Description: NOAA Landing Page # Online_Resource: https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013-13pc-proj-age.txt # Description: NOAA location of the template # # Original_Source_URL: # Description: # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Paleoceanography # # Dataset DOI: # # Parameter_Keywords: age control, carbon isotopes #-------------------- # Contribution_Date # Date: 2018-09-07 #-------------------- # File_Last_Modified_Date # Date: 2018-09-07 #-------------------- # Title # Study_Name: Deep Pacific 22,000 Year D14C Data and Projection Ventilation Ages #-------------------- # Investigators # Investigators: Lund, D.C. #-------------------- # Description_Notes_and_Keywords # Description: Deep Pacific ventilation ages estimated from D14C using revised projection age and TTD-ETD methods on 4 Pacific Ocean sediment cores for the past 22,000 years. #-------------------- # Publication # Authors: David C.Lund # Published_Date_or_Year: 2013-11-01 # Published_Title: Deep Pacific ventilation ages during the last deglaciation: Evaluating the influence of diffusive mixing and source region reservoir age # Journal_Name: Earth and Planetary Science Letters # Volume: 381 # Edition: # Issue: # Pages: 52-62 # Report_Number: # DOI: 10.1016/j.epsl.2013.08.032 # Online_Resource: https://www.sciencedirect.com/science/article/pii/S0012821X1300469X # Full_Citation: # Abstract: Enhanced ventilation of the deep ocean during the last deglaciation may have caused the rise in atmospheric carbon dioxide that drove Earth's climate from a glacial to interglacial state. Recent results based on the projection age method, however, suggest the ventilation rate of the deep Pacific slowed during the deglaciation, opposite the expected pattern (Lund et al., 2011). Because the projection age method does not account for tracer diffusion (Adkins and Boyle, 1997) it can yield spurious results and therefore requires validation with alternative techniques. Here ventilation ages are determined using the transit-time equilibration-time distribution (TTD-ETD) method which explicitly accounts for diffusive mixing in the ocean interior (DeVries and Primeau, 2010). The overall time history of deep Pacific TTD-ETD and projection ages is very similar; both show a 1000-yr increase in ventilation age during Heinrich Stadial 1 (HS1; 14.5-17.5 kyr BP) and a 500-yr increase during the Younger Dryas (YD). The similarity is due in part to the use of projection age error estimates that take into account uncertainty in both calendar age and benthic 14C age. Centennial-scale offsets between the TTD-ETD and projection ages are due primarily to the different approaches used to estimate surface ocean radiocarbon content. Both the TTD-ETD and projection age results imply that the ventilation rate of the deep Pacific decreased during the deglaciation, opposite the pattern expected if Southern Ocean upwelling and enhanced meridional overturning drove outgassing of CO2 from the abyss. Variations in surface water reservoir age could cause an apparent shift in deep Pacific ventilation age but existing proxy records from the Southern Ocean appear to be inconsistent with such a driver. #------------------ # Funding_Agency # Funding_Agency_Name: University of Michigan # Grant: #------------------ # Site_Information # Site_Name: W8709A-13PC # Location: Ocean>Pacific Ocean>North Pacific Ocean # Country: # Northernmost_Latitude: 42.1 # Southernmost_Latitude: 42.1 # Easternmost_Longitude: -125.8 # Westernmost_Longitude: -125.8 # Elevation: -2710 m #------------------ # Data_Collection # Collection_Name: Lund2013-13PC-proj-age # Earliest_Year: 22600 # Most_Recent_Year: 50 # Time_Unit: Cal. Year BP # Core_Length: # Notes: #------------------ # Chronology_Information # Chronology: # #---------------- # Variables # # Data variables follow are preceded by "##" in columns one and two. # Data line variables format: one per line, shortname-tab-variable components (what, material, error, units, seasonality, data type,detail, method, C or N for Character or Numeric data, free text) # ## age_calkaBP age, , , calendar Kyears before present, , , , ,N, ## D14C Delta 14C, , , per mil, ,Paleoceanography,mean D14C,,N, ## age_proj Projection age, , , years, , , , ,N, # #---------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Values: # age_calkaBP D14C age_proj 0.050 -242.721 1311.976 8.338 -167.450 1443.591 8.904 -150.788 1378.166 9.213 -131.029 1276.406 9.816 -115.796 1373.563 9.999 -120.482 1314.297 10.456 -128.723 1966.124 10.549 -150.519 2138.660 11.531 -114.143 1734.892 11.413 -124.112 1855.658 12.012 -98.181 1561.273 12.306 -81.460 1405.034 11.991 -118.547 1766.294 12.784 -82.596 1376.569 13.159 -107.656 2075.992 13.612 -104.873 2891.150 13.881 -98.397 2875.077 14.256 -101.752 2761.712 14.354 -70.802 2513.384 15.636 46.802 1478.926 15.706 13.281 1791.004 16.305 -10.617 2145.071 16.278 36.106 1666.297 16.275 6.207 1967.476 16.867 47.358 1693.488 17.024 30.675 1672.780 17.197 3.815 1775.234 17.685 23.591 1707.307 18.074 70.103 1336.639 18.207 63.208 1309.929 19.161 32.772 1803.800 19.396 31.665 1914.773 20.552 107.484 1410.828 22.600 56.203 2161.042