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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 gru 2019 · The stable isotopes of carbon (δ 13 C) track changes in photosynthesis, respiration, organic matter decomposition and anthropogenic fuel emission inputs (e.g., McDowell et al., 2008), while the oxygen isotopes of water (δ 16 O and δ 18 O) contain information on the linkages between the carbon and water cycles (Dawson and Simonin, 2011).
Stable carbon isotope (δ 13 C) values are important indicators in carbon cycling, which can be used to qualitatively or quantitatively trace carbon sources, indicate carbon cycling processes, and determine end-members of the supply (Chen and Wang, 2012; Fan et al., 2020).
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 ...
28 wrz 2021 · Stable isotopes of hydrogen, carbon and oxygen are used to investigate numerous physical and chemical processes in the water and inorganic carbon cycles. Measuring and comparing natural...
26 lis 2018 · James Powell of the National Physical Sciences Consortium says these isotopes are found in different proportions in different substances. For example, the carbon found in plants has a distinct ratio of the isotopes carbon-12 and carbon-13. There’s also a difference between the carbon isotopes in living plants and those in fossil fuels, which ...
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.
