noaa-ocean-25110 Deep Pacific 22,000 Year D14C Data and Projection Ventilation Ages Lund, D.C. Deep Pacific 22,000 Year D14C Data and Projection Ventilation Ages 2018-09-07 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/25110 Investigator D.C. Lund 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 carbon isotopes geoscientificInformation 25854 cal yr BP 9 cal yr BP Complete 1.13 54.39 -148.92 129.793 -3640 -2712 Ocean Pacific Ocean Western Pacific Ocean MD01-2386>LATITUDE 1.13>LONGITUDE 129.793 Ocean Pacific Ocean North Pacific Ocean W8709A-13PC>LATITUDE 42.12>LONGITUDE -125.75 Ocean Pacific Ocean North Pacific Ocean MD02-2489>LATITUDE 54.39>LONGITUDE -148.92 Ocean Pacific Ocean North Pacific Ocean ODP 887>LATITUDE 54.3655>LONGITUDE -148.4463 None 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. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII David C. Lund 2013 Earth and Planetary Science Letters 381 52-62 10.1016/j.epsl.2013.08.032 https://www.sciencedirect.com/science/article/pii/S0012821X1300469X

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

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013-13pc-d14c-err.txt NOAA Template File; Core W8709A-13PC D14C Error Estimates GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013-2386-dd14c.txt NOAA Template File; Core MD01-2386 DD14C Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013-2386-proj-age-err.txt NOAA Template File; Core MD01-2386 Projection Age Error Estimates GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013-2386-ttd-age.txt NOAA Template File; Core MD01-2386 TTD Ages GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013-887-proj-age-err.txt NOAA Template File; Core ODP887 Projection Age Error Estimates GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013-13pc-ttd-age.txt NOAA Template File; Core W8709A-13PC TTD Ages GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013-2386-d14c-err.txt NOAA Template File; Core MD01-2386 D14C Error Estimates GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013-2489-d14c-err.txt NOAA Template File; Core MD02-2489 D14C Error Estimates GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013-13pc-proj-age-err.txt NOAA Template File; Core W8709A-13PC Projection Age Error Estimates GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013-13pc-ttd-age-err.txt NOAA Template File; Core W8709A-13PC TTD Age Error Estimates GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013-887-d14c-err.txt NOAA Template File; Core ODP887 D14C Error Estimates GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013-13pc-dd14c.txt NOAA Template File; Core W8709A-13PC DD14C Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013-13pc-proj-age.txt NOAA Template File; Core W8709A-13PC D14C and Projection Age GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013-13pc-dd14c-err.txt NOAA Template File; Core W8709A-13PC DD14C Error Estimates GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013.xls Excel File; All D14C, Projection Age, TTD Age Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013-2386-ttd-age-err.txt NOAA Template File; Core MD01-2386 TTD Age Error Estimates GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013-2489-proj-age-err.txt NOAA Template File; Core MD02-2489 Projection Age Error Estimates GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013-2489-proj-age.txt NOAA Template File; Core MD02-2489 D14C and Projection Age GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013-887-proj-age.txt NOAA Template File; Core ODP887 D14C and Projection Age GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013-2386-dd14c-err.txt NOAA Template File; Core MD01-2386 DD14C Error Estimates GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lund2013/lund2013-2386-proj-age.txt NOAA Template File; Core MD01-2386 D14C and Projection Age USA/NOAA DIF Version 9.8.4 2019-06-06 2019-06-06