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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.
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.
15 lis 2020 · Emissions of CO2 from fossil fuel combustion and land use change reduce the ratio of 13C/12C in atmospheric CO2 (δ13CO2). This is because 12C is preferentially assimilated during photosynthesis...
The two main carbon isotopes are 12 C and 13 C. Plants absorb the lighter isotope, 12 C, more readily than 13 C. [25] Because fossil fuels originate mainly from plant matter, the 13 C/ 12 C ratio in the atmosphere falls when large amounts of fossil fuels are burned, releasing 12 C.
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 ...
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 sty 2004 · Iso- topic analyses of CO2 and CH4 provide key tools for better understanding global bud- gets of these trace gases. In this chapter we describe two different methods for measuring carbon and oxygen isotopes in atmospheric CO2 and a method for measur- ing carbon isotopes in atmospheric CH4.
