In the second half of the Cenozoic, CO2 started to decrease very rapidly. By the Pleistocene, it was close to its modern value. The empirical data on atmospheric content of greenhouse gases are cited for the last 400 000 years.

Jun 19, 2009 · Here we present a 2.1-million-year record of sea surface partial pressure of CO 2 (Pco2), based on boron isotopes in planktic foraminifer shells, which suggests that the atmospheric partial pressure of CO 2 (pco2) was relatively stable before the mid-Pleistocene climate transition.

Sep 25, 2019 · Quantifying ancient atmospheric p CO 2 provides valuable insights into the interplay between greenhouse gases and global climate. Beyond the 800-ky history uncovered by ice cores, discrepancies...

before the mid-Pleistocene climate transition. Glacial PCO2 was ~31 microatmospheres higher before the transition (more than 1 million years ago), but interglacial PCO2 was similar to that of late Pleistocene interglacial cycles (<450,000 years ago). These estimates are consistent with a close linkage between atmospheric CO

Sep 15, 2015 · We provide the first continental documentation of early Pleistocene pCO 2 record. Our results show a successive decrease of interglacial pCO 2 throughout the early Pleistocene. Atmospheric CO 2 acted as an important forcing mechanism to …

Sep 23, 2016 · We present a record of Po2 reconstructed using O 2 /N 2 ratios from ancient air trapped in ice. This record indicates that Po2 declined by 7 per mil (0.7%) over the past 800,000 years, requiring that O 2 sinks were ~2% larger than sources.

Nov 25, 2005 · Earth's climate during the late Pleistocene was characterized by ice age cycles with relatively short warm periods (interglacials) and longer cold periods (glacials) . The Vostok ice core provided an archive of climate and atmospheric composition over the past four climatic cycles back to marine isotope stage (MIS) 11, about 420 thousand years ...

Jul 15, 2022 · The isotopic composition of atmospheric CO 2 changed through geological time, and it has an effect on δ 13 C values of plants. To eliminate CO 2 effects, the modern equivalent of diet composition (δ 13 C diet,meq) was calculated following the equations of Kohn (2010).

Jul 9, 2020 · M2 glacial and early Pleistocene strong glacials are highlighted in blue for context. Interglacial KM5 and KM5c are highlighted in yellow and orange, respectively.

Jun 2, 2015 · Here, we present direct measurements of atmospheric composition and Antarctic climate from the mid-Pleistocene (∼1 Ma) from ice cores drilled in the Allan Hills blue ice area, Antarctica.