Deglacial North East Pacific Radiocarbon and Boron Isotope Data from MD02-2489 Rae, J.W.B.; Sarnthein, M.; Foster, G.L.; Ridgwell, A.; Grootes, P.M.; Elliott, T. Rae, J.W.B. Sarnthein, M. Foster, G.L. Ridgwell, A. Grootes, P.M. Elliott, T. Dansgaard-Oeschger cycles earth science/paleoclimate/paleoceanography (age,null,null,radiocarbon year before present,null,paleoceanography,null,null,N,raw conventional 14C) earth science/paleoclimate/paleoceanography (age,null,null,radiocarbon year before present,null,paleoceanography,null,null,N,benthic foraminifer) earth science/paleoclimate/paleoceanography (age,null,one standard deviation,radiocarbon year before present,null,paleoceanography,null,null,N,benthic foraminifer) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,null) earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (age,planktic foraminifer,null,radiocarbon year before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (Delta 14C,planktic foraminifer,null,per mil VPDB,null,paleoceanography,corrected,null,N,corrected for mass dependent isotope fractionation) earth science/paleoclimate/paleoceanography (age,null,null,radiocarbon year,null,paleoceanography,differenced,null,N,Difference between planktic foraminifera and the contemporaneous atmosphere units) earth science/paleoclimate/paleoceanography (age,null,null,radiocarbon year before present,null,paleoceanography,null,null,N,planktic foraminifer) earth science/paleoclimate/paleoceanography (Delta 14C,foraminifer,null,per mil VPDB,null,paleoceanography,corrected,null,N,corrected for mass dependent isotope fractionation) earth science/paleoclimate/paleoceanography (delta 11B,Cibicidoides wuellerstorfi,null,per mil,null,paleoceanography,null,null,N,per mil NIST 951) earth science/paleoclimate/paleoceanography (age,null,one standard deviation,radiocarbon year before present,null,paleoceanography,null,null,N,planktic foraminifer) earth science/paleoclimate/paleoceanography (age,null,null,radiocarbon year,null,paleoceanography,differenced,null,N,age difference benthic-planktonic foraminifera) earth science/paleoclimate/paleoceanography (age,null,null,calendar year before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (age,null,one standard deviation,radiocarbon year before present,null,paleoceanography,null,null,N,raw conventional 14C) earth science/paleoclimate/paleoceanography (delta 11B,Cibicidoides wuellerstorfi,two standard deviations,per mil,null,paleoceanography,null,null,N,per mil NIST 951) earth science/paleoclimate/paleoceanography (age,null,one standard deviation,radiocarbon year,null,paleoceanography,differenced,null,N,age difference benthic-planktonic foraminifera) earth science/paleoclimate/paleoceanography (Delta 14C,benthic foraminifer,null,per mil VPDB,null,paleoceanography,differenced,null,N,Difference between benthic foraminifera and the contemporaneous atmosphere units) earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,plateau-tuned) earth science/paleoclimate/paleoceanography (Delta 14C,benthic foraminifer,null,per mil VPDB,null,paleoceanography,corrected,null,N,corrected for mass dependent isotope fractionation) earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,using delta 18O ties) earth science/paleoclimate/paleoceanography (age,null,null,radiocarbon year,null,paleoceanography,differenced,null,N,difference between benthic foraminifera and the contemporaneous atmosphere units) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (Delta 14C,foraminifer,one standard deviation,per mil VPDB,null,paleoceanography,corrected,null,N,corrected for mass dependent isotope fractionation) earth science/paleoclimate/paleoceanography (age,planktic foraminifer,one standard deviation,radiocarbon year before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (Delta 14C,planktic foraminifer,null,per mil VPDB,null,paleoceanography,differenced,null,N,Difference between planktic foraminifera and the contemporaneous atmosphere units) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (MD02-2489>LATITUDE 54.39>LONGITUDE -148.92) (ODP 887>LATITUDE 54.3655>LONGITUDE -148.4463) Deep water formation in the North Atlantic and Southern Ocean is widely thought to influence deglacial CO2 rise and climate change; here we suggest that deep water formation in the North Pacific may also play an important role. We present paired radiocarbon and boron isotope data from foraminifera from sediment core MD02-2489 at 3640 m in the North East Pacific. These show a pronounced excursion during Heinrich Stadial 1, with benthic-planktic radiocarbon offsets dropping to ~350 years, accompanied by a decrease in benthic d11B. We suggest this is driven by the onset of deep convection in the North Pacific, which mixes young shallow waters to depth, old deep waters to the surface, and low-pH water from intermediate depths into the deep ocean. This deep water formation event was likely driven by an increase in surface salinity, due to subdued atmospheric/monsoonal freshwater flux during Heinrich Stadial 1. The ability of North Pacific Deep Water (NPDW) formation to ex plain the excursions seen in our data is demonstrated in a series of experiments with an intermediate complexity Earth system model. These experiments also show that breakdown of stratification in the North Pacific leads to a rapid ~30 ppm increase in atmospheric CO2, along with decreases in atmospheric d13C and d14C, consistent with observations of the early deglaciation. Our inference of deep water formation is based mainly on results from a single sediment core, and our boron isotope data are unavoidably sparse in the key HS1 interval, so this hypothesis merits further testing. However we note that there is independent support for breakdown of stratification in shallower waters during this period, including a minimum in d15N, younging in intermediate water 14C, and regional warming. We also re-evaluate deglacial changes in North Pacific productivity and carbonate preservation in light of our new data, and suggest that the regional pulse of export production observe d during the Bølling-Allerød is promoted by relatively stratified conditions, with increased light availability and a shallow, potent nutricline. Overall, our work highlights the potential of NPDW formation to play a significant and hitherto unrealized role in deglacial climate change and CO2 rise. STUDY NOTES: The data given here include age models, boron isotope data analysed by MC-ICPMS, and radiocarbon data analysed by AMS. Keywords from PI: Radiocarbon; Boron isotopes; North Pacific; Deglacial CO2; Deep water formation; NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Rae, J.W.B. Investigator : Sarnthein, M. Investigator : Foster, G.L. Investigator : Ridgwell, A. Investigator : Grootes, P.M. Investigator : Elliott, T. 2014-06-18 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/16648 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/rae2014/rae2014-t6.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/rae2014/rae2014-t7.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/rae2014/rae2014-t4.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/rae2014/rae2014-t5.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/rae2014/rae2014-t3.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/rae2014/rae2014-fulldata.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/rae2014/rae2014-t1.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/rae2014/rae2014-t2.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/rae2014/rae2014-t6.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/rae2014/rae2014-t7.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/rae2014/rae2014-t4.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/rae2014/rae2014-t5.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/rae2014/rae2014-t3.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/rae2014/rae2014-fulldata.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/rae2014/rae2014-t1.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/rae2014/rae2014-t2.txt English https://www.ncdc.noaa.gov/paleo/study/16648 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/rae2014/rae2014-t6.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/rae2014/rae2014-t7.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/rae2014/rae2014-t4.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/rae2014/rae2014-t5.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/rae2014/rae2014-t3.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/rae2014/rae2014-fulldata.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/rae2014/rae2014-t1.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/rae2014/rae2014-t2.txt Rae, J.W.B., M. Sarnthein, G.L. Foster, A. Ridgwell, P.M. Grootes, and T. Elliott2014Deep water formation in the North Pacific and deglacial CO2 risePaleoceanography10.1002/2013PA002570 START YEAR: 50000 cal yr BP * END YEAR: -5 cal yr BP -148.92 54.3655 -148.4463 54.39