Paleo-pCO2 Database Western Pacific 20 Million Year B/Ca and CO2 Data Tripati, A.K.; Roberts, C.D.; Eagle, R.A. Tripati, A.K. Roberts, C.D. Eagle, R.A. earth science/paleoclimate/climate forcing|climate reconstructions|paleoceanography (age,null,null,calendar year before present,null,climate forcing|climate reconstructions|paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (boron/calcium,planktic foraminifer,null,micromole per mole,null,paleoceanography,null,null,N,null) earth science/paleoclimate/climate forcing|paleoceanography (carbon dioxide,bulk atmosphere,two standard deviations lower bound,parts per million,null,climate forcing|paleoceanography,null,null,N,based on boron/calcium) earth science/paleoclimate/climate forcing|paleoceanography (carbon dioxide,bulk atmosphere,null,parts per million,null,climate forcing|paleoceanography,null,null,N,based on boron/calcium) earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (magnesium/calcium,planktic foraminifer,null,millimole per mole,null,paleoceanography,null,null,N,null) earth science/paleoclimate/climate forcing|paleoceanography (carbon dioxide,bulk atmosphere,two standard deviations upper bound,parts per million,null,climate forcing|paleoceanography,null,null,N,based on boron/calcium) earth science/paleoclimate/climate forcing (ODP 806B>LATITUDE .32>LONGITUDE 159.35) (ODP588>LATITUDE -26.101944>LONGITUDE 161.218333) The carbon dioxide (CO2) content of the atmosphere has varied cyclically between ~180 and ~280 parts per million by volume over the past 800,000 years, closely coupled with temperature and sea level. For earlier periods in Earth's history, the partial pressure of CO2 (pCO2) is much less certain, and the relation between pCO2 and climate remains poorly constrained. We use boron/calcium ratios in foraminifera to estimate pCO2 during major climate transitions of the past 20 million years. During the Middle Miocene, when temperatures were ~3 to 6C warmer and sea level was 25 to 40 meters higher than at present, pCO2 appears to have been similar to modern levels. Decreases in pCO2 were apparently synchronous with major episodes of glacial expansion during the Middle Miocene (~14 to 10 million years ago) and Late Pliocene (~3.3 to 2.4 million years ago). STUDY NOTES: Paleo-CO2 derived from boron/calcium measurements on planktonic foraminifera samples from 2 Ocean Drilling Program cores collected in the western Pacific, contributed to the Paleo-pCO2 Database. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Tripati, A.K. Investigator : Roberts, C.D. Investigator : Eagle, R.A. 2018-06-06 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/24350 https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/tripati2009b-ca.txt https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/tripati2009b-ca.xlsx https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/tripati2009b-ca.txt https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/tripati2009b-ca.xlsx English https://www.ncdc.noaa.gov/paleo/study/24350 https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/tripati2009b-ca.txt https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/Paleo-pCO2/tripati2009b-ca.xlsx Aradhna K. Tripati, Christopher D. Roberts, Robert A. Eagle2009Coupling of CO2 and Ice Sheet Stability Over Major Climate Transitions of the Last 20 Million YearsScience32659581394-139710.1126/science.1178296http://science.sciencemag.org/content/326/5958/1394 START YEAR: 19060000 cal yr BP * END YEAR: 6183 cal yr BP 159.35 -26.101944 161.218333 .32