Deep Pacific 22,000 Year D14C Data and Projection Ventilation Ages Lund, D.C. Lund, D.C. earth science/paleoclimate/paleoceanography (Delta 14C,benthic foraminifer,null,per mil,null,paleoceanography,averaged,null,N,mean D14C) earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography|paleoclimatic modeling (ventilation age,null,null,year,null,paleoceanography|paleoclimatic modeling,null,null,N,TTD Mean; transit-time equilibration-time distribution (TTD–ETD) method) earth science/paleoclimate/paleoceanography (Delta 14C,benthic foraminifer,unspecified error upper bound,per mil,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography|paleoclimatic modeling (age,null,null,calendar kiloyear before present,null,paleoceanography|paleoclimatic modeling,null,null,N,null) earth science/paleoclimate/paleoceanography|paleoclimatic modeling (ventilation age,null,unspecified error lower bound,year,null,paleoceanography|paleoclimatic modeling,null,null,N,projection age method) earth science/paleoclimate/paleoceanography (Delta 14C,benthic foraminifer,unspecified error lower bound,per mil,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (Delta 14C,benthic foraminifer,null,per mil,null,paleoceanography,differenced,null,N,required change in surface ocean Delta 14C (Delta Delta 14C)) earth science/paleoclimate/paleoceanography|paleoclimatic modeling (ventilation age,null,unspecified error upper bound,year,null,paleoceanography|paleoclimatic modeling,null,null,N,transit-time equilibration-time distribution (TTD–ETD) method) earth science/paleoclimate/paleoceanography|paleoclimatic modeling (ventilation age,null,null,year,null,paleoceanography|paleoclimatic modeling,null,null,N,projection age method) earth science/paleoclimate/paleoceanography|paleoclimatic modeling (ventilation age,null,unspecified error upper bound,year,null,paleoceanography|paleoclimatic modeling,null,null,N,projection age method) earth science/paleoclimate/paleoceanography|paleoclimatic modeling (ventilation age,null,unspecified error lower bound,year,null,paleoceanography|paleoclimatic modeling,null,null,N,transit-time equilibration-time distribution (TTD–ETD) method) earth science/paleoclimate/paleocean (MD01-2386>LATITUDE 1.13>LONGITUDE 129.793) (W8709A-13PC>LATITUDE 42.12>LONGITUDE -125.75) (MD02-2489>LATITUDE 54.39>LONGITUDE -148.92) (ODP 887>LATITUDE 54.3655>LONGITUDE -148.4463) 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. STUDY NOTES: 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 NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Lund, D.C. 2018-09-07 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/25110 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013-13pc-d14c-err.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013-2386-dd14c.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013-2386-proj-age-err.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013-2386-ttd-age.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013-887-proj-age-err.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013-13pc-ttd-age.txt 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https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013-887-proj-age.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013-2386-dd14c-err.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013-2386-proj-age.txt David C. Lund2013Deep Pacific ventilation ages during the last deglaciation: Evaluating the influence of diffusive mixing and source region reservoir ageEarth and Planetary Science Letters38152-6210.1016/j.epsl.2013.08.032https://www.sciencedirect.com/science/article/pii/S0012821X1300469X START YEAR: 25854 cal yr BP * END YEAR: 9 cal yr BP -148.92 1.13 129.793 54.39