# 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-ttd-age-err.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-TTD-age-err # Earliest_Year: 25854 # Most_Recent_Year: 9 # 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, ## age_TTD+ TTD age upper, , , years, , , , ,N,transit-time equilibration-time distribution (TTD–ETD) method ## age_calkaBP- age, , , calendar Kyears before present, , , , ,N, ## age_TTD- TTD age lower, , , years, , , , ,N, transit-time equilibration-time distribution (TTD–ETD) method # #---------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Values: # age_calkaBP+ age_TTD+ age_calkaBP- age_TTD- 9 1782 11 1424 8117 1997 8583 1199 8693 2299 9139 1809 9018 1668 9420 1048 9611 1792 10047 1186 9728 2194 10298 1450 10258 2062 10678 1404 10137 2969 10975 1997 10973 2752 11871 1804 11254 2223 11824 1515 11674 2233 12378 1311 12090 2086 12540 1528 11647 2296 12353 1574 12611 2351 12965 1787 12963 2788 13373 2090 13417 3052 13821 2386 13565 3195 14215 2351 13994 3423 14544 2689 14097 2848 14633 2124 15360 2111 15934 1387 15264 2081 16172 1063 15955 2837 16673 2081 15953 2121 16625 1099 15803 2366 16771 1412 16697 1868 17079 1224 16813 2119 17245 1497 16946 2508 17468 1764 17384 2125 18000 1307 17669 2100 18495 1072 17953 2010 18475 1314 18955 2280 19373 1630 19062 2230 19744 1502 20246 1968 20880 1158 22264 2700 22950 1952 24904 3644 25854 1804