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23 paź 2020 · Key Points. Carbon isotopes, 14 C and 13 C, in atmospheric CO 2 are changing in response to fossil fuel emissions and other human activities. Future simulations using different SSPs show continued changes in isotopic ratios that depend on fossil fuel emissions and, for 13 C, BECCS.
14 mar 2016 · Thomas K. Bauska et al. measured the isotopic composition of carbon dioxide trapped in the ice to study changes in Earth's atmosphere during the last deglaciation between 20,000 and 10,000 years ago. The results reveal several instances of rapid rise in atmospheric carbon dioxide and suggest that two events were driven by a loss of land carbon ...
1 kwi 2017 · Here we show that the fractionation of the stable carbon isotopes between atmospheric CO 2 and dissolved inorganic carbon was variable throughout the Cretaceous and thus δ 13 C carb records constitute temperature-biased pictures of the evolution of the global carbon cycle during the period.
1 gru 2019 · TDLAS measures the mixing ratios of stable isotopes of carbon dioxide in the air (e.g., the isotopologues, 12 C 16 O 2, 13 C 16 O 2 and 16 O 12 C 18 O) by comparing the infrared absorption of sample and reference gases in a specific absorption line of the spectrum (Santos et al., 2012).
Introduction. Carbon isotopes are present in the atmosphere, ocean, and terrestrial biosphere in ratios of approximately 99% 12C/C, 1% 13C/C, and 1 × 10−1214C/C. 12C and 13C are stable isotopes while 14C is a radioactive isotope called radiocarbon.
28 wrz 2011 · The stable isotope ratios of atmospheric CO2 (18O/16O and 13C/12C) have been monitored since 1977 to improve our understanding of the global carbon cycle, because biosphere–atmosphere exchange...
17 sty 2018 · Atmospheric effects must be taken into account when interpreting terrestrial stable carbon isotopes, with important implications for past environments and climates, and understanding plant ...
