noaa-ocean-10423 Atmospheric CO2 20 Million Year Foraminiferal B/Ca Reconstruction Tripati, A.K.; Roberts, C.D.; Eagle, R.A. Atmospheric CO2 20 Million Year Foraminiferal B/Ca Reconstruction 2010-06-18 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/10423 Investigator A.K. Tripati Investigator C.D. Roberts Investigator R.A. Eagle earth science paleoclimate paleoceanography boron/calcium,planktic foraminifer,null,micromole per mole,null,paleoceanography,null,null,N,null earth science paleoclimate climate forcing carbon dioxide,null,range upper bound,parts per million,null,climate forcing,null,null,N,foraminifer boron/calcium earth science paleoclimate paleoceanography depth,null,null,meter,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography delta 13C,planktic foraminifer,null,per mil PDB,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,N,species analyzed earth science paleoclimate climate forcing carbon dioxide,null,null,parts per million,null,climate forcing,averaged,null,N,foraminifer boron/calcium earth science paleoclimate climate forcing carbon dioxide,null,range lower bound,parts per million,null,climate forcing,null,null,N,foraminifer boron/calcium earth science paleoclimate paleoceanography magnesium/calcium,planktic foraminifer,null,millimole per mole,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography delta 18O,planktic foraminifer,null,per mil PDB,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography age,null,null,million years ago,null,paleoceanography,null,null,N,null earth science paleoclimate paleocean geochemistry earth science paleoclimate paleocean reconstruction geoscientificInformation Atmospheric Gas Reconstruction carbon cycle 20000000 cal yr BP 0 cal yr BP Complete -26 .32 159.35 161 -2520 -1548 Ocean Pacific Ocean Western Pacific Ocean DSDP 588>LATITUDE -26>LONGITUDE 161 Ocean Pacific Ocean North Pacific Ocean ODP 806B>LATITUDE .32>LONGITUDE 159.35 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

325 Broadway, E/NE31

Boulder CO 80305-3328 USA online ASCII Aradhna K. Tripati, Christopher D. Roberts, Robert A. Eagle 2009 Science 326 5958 1394-1397 10.1126/science.1178296 http://science.sciencemag.org/content/326/5958/1394

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: Paleoatmospheric CO2 concentrations estimated from the boron/calcium ratio of planktonic foraminifera. Samples from Deep Sea Drilling Project Site 588 and Ocean Drilling Program Site 806 were used to reconstruct pCO2 values from the Miocene through Holocene (~20 to 0 Ma). Average, maximum, and minimum pCO2 estimates are calculated for each time.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/tripati2009/tripati2009.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/tripati2009/tripati2009.xls USA/NOAA DIF Version 9.8.4 2019-04-29 2019-04-29