7
views
0
recommends
+1 Recommend
0 collections
    0
    shares
      • Record: found
      • Abstract: not found
      • Article: not found

      Oxygenation as a driver of the Great Ordovician Biodiversification Event

      , , ,
      Nature Geoscience
      Springer Nature

      Read this article at

      ScienceOpenPublisher
      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Related collections

          Most cited references52

          • Record: found
          • Abstract: not found
          • Article: not found

          GEOCARBSULF: A combined model for Phanerozoic atmospheric O2 and CO2

            Bookmark
            • Record: found
            • Abstract: found
            • Article: not found

            Fractionation of carbon isotopes by phytoplankton and estimates of ancient CO2levels

            Reports of the 13C content of marine particulate organic carbon are compiled and on the basis of GEOSECS data and temperatures, concentrations, and isotopic compositions of dissolved CO2 in the waters in which the related phytoplankton grew are estimated. In this way, the fractionation of carbon isotopes during photosynthetic fixation of CO2 is found to be significantly correlated with concentrations of dissolved CO2. Because ancient carbon isotopic fractionations have been determined from analyses of sedimentary porphyrins [Popp et al., 1989], the relationship between isotopic fractionation and concentrations of dissolved CO2 developed here can be employed to estimate concentrations of CO2 dissolved in ancient oceans and, in turn, partial pressures of CO2 in ancient atmospheres. The calculations take into account the temperature dependence of chemical and isotopic equilibria in the dissolved-inorganic-carbon system and of air-sea equilibria. Paleoenvironmental temperatures for each sample are estimated from reconstructions of paleogeography, latitudinal temperature gradients, and secular changes in low-latitude sea surface temperature. It is estimated that atmospheric partial pressures of CO2 were over 1000 micro atm 160 - 100 Ma ago, then declined to values near 300 micro atm during the next 100 Ma. Analysis of a high-resolution record of carbon isotopic fractionation at the Cenomanian-Turonian boundary suggests that the partial pressure of CO2 in the atmosphere was drawn down from values near 840 micro atm to values near 700 micro atm during the anoxic event.
              Bookmark
              • Record: found
              • Abstract: not found
              • Article: not found

              Effect of Phytoplankton Cell Geometry on Carbon Isotopic Fractionation

                Bookmark

                Author and article information

                Journal
                Nature Geoscience
                Nature Geosci
                Springer Nature
                1752-0894
                1752-0908
                December 2017
                November 20 2017
                : 10
                : 12
                : 925-929
                Article
                10.1038/s41561-017-0006-3
                91ca1e52-3bc0-4374-a7bf-5e43374a9a04
                © 2017

                http://www.springer.com/tdm


                Comments

                Comment on this article