Paleo-pCO2 Database Malta Middle Miocene Boron Isotope and CO2 Data Badger, M.P.S.; Lear, C.H.; Pancost, R.D.; Foster, G.L.; Bailey, T.R.; Leng, M.J.; Abels, H.A. Badger, M.P.S. Lear, C.H. Pancost, R.D. Foster, G.L. Bailey, T.R. Leng, M.J. Abels, H.A. earth science/paleoclimate/climate reconstructions|paleoceanography (pH,delta 11B,null,dimensionless,null,climate reconstructions|paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 11B,planktic foraminifer,two standard deviations,per mil,null,paleoceanography,null,ion chromatography|multiple collector inductively-coupled plasma mass spectrometry,N,Globigerinoides/Trilobatus trilobus) earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,Globigerinoides trilobus) earth science/paleoclimate/climate forcing|climate reconstructions|paleoceanography (age,null,null,million years ago,null,climate forcing|climate reconstructions|paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 11B,planktic foraminifer,null,per mil,null,paleoceanography,null,ion chromatography|multiple collector inductively-coupled plasma mass spectrometry,N,Globigerinoides/Trilobatus trilobus) earth science/paleoclimate/climate forcing|paleoceanography (carbon dioxide,bulk atmosphere,null,parts per million,null,climate forcing|paleoceanography,null,null,N,based on 11B of Globigerinoides trilobus) earth science/paleoclimate/climate forcing (Ras il-Pellegrin Section>LATITUDE 35.9155>LONGITUDE 14.3343) The development of a permanent, stable ice sheet in East Antarctica happened during the middle Miocene, about 14 million years (Myr) ago. The middle Miocene therefore represents one of the distinct phases of rapid change in the transition from the "greenhouse" of the early Eocene to the "icehouse" of the present day. Carbonate carbon isotope records of the period immediately following the main stage of ice sheet development reveal a major perturbation in the carbon system, represented by the positive d13C excursion known as carbon maximum 6 ("CM6"), which has traditionally been interpreted as reflecting increased burial of organic matter and atmospheric pCO2 drawdown. More recently, it has been suggested that the d13C excursion records a negative feedback resulting from the reduction of silicate weathering and an increase in atmospheric pCO2. Here we present high-resolution multi-proxy (alkenone carbon and foraminiferal boron isotope) records of atmospheric carbon dioxide and sea surface temperature across CM6. Similar to previously published records spanning this interval, our records document a world of generally low (~300 ppm) atmospheric pCO2 at a time generally accepted to be much warmer than today. Crucially, they also reveal a pCO2 decrease with associated cooling, which demonstrates that the carbon burial hypothesis for CM6 is feasible and could have acted as a positive feedback on global cooling. STUDY NOTES: Paleo-CO2 derived from boron isotope measurements on planktonic foraminifera samples from the Middle Miocene Blue Clay Formation of Malta (sampled at Ras il-Pellegrin), contributed to the Paleo-pCO2 Database. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Badger, M.P.S. Investigator : Lear, C.H. Investigator : Pancost, R.D. Investigator : Foster, G.L. Investigator : Bailey, T.R. Investigator : Leng, M.J. Investigator : Abels, H.A. 2018-05-30 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/24310 https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/badger2013boron.xlsx https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/badger2013boron.txt https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/badger2013boron.xlsx https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/badger2013boron.txt English https://www.ncdc.noaa.gov/paleo/study/24310 https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/badger2013boron.xlsx https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/badger2013boron.txt Marcus P.S. Badger, Caroline H. Lear, Richard D. Pancost, Gavin L. Foster, Trevor R. Bailey, Melanie J. Leng, Hemmo A. Abels2013CO2 drawdown following the middle Miocene expansion of the Antarctic Ice SheetPaleoceanography and Paleoclimatology28142-5310.1002/palo.20015https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/palo.20015 START YEAR: 13798000 cal yr BP * END YEAR: 13698000 cal yr BP 14.3343 35.9155 14.3343 35.9155