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23 paź 2020 · 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.
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.
14 mar 2016 · We identify four major patterns of variability of the carbon cycle spanning the length of our record: (i) a millennial-scale increase in CO 2 and decrease in δ 13 C-CO 2 during the early part of Heinrich Stadial 1 (17.6–15.5 ka); (ii) rising CO 2 with generally increasing δ 13 C-CO 2 during the later portion of Heinrich Stadial 1 (15.5–14 ...
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).
1 paź 2019 · We discuss carbon isotope ratios as tracers in atmospheric carbon dioxide and methane, along with DIC, DOC, and methane in ocean and pore waters. We then address carbon isotope ratios of organic matter and foraminiferal carbonate in relationship to their ambient sea-water isotope composition and their utility as non-conservative proxies.
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.
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 ...
