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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.
importance of atmospheric chemistry in controlling greenhouse gases: Currently, tropospheric ozone (O 3) is the third most important greenhouse gas after carbon dioxide (CO 2) and methane (CH 4). It is a product of photochemistry, and its future abundance is controlled primarily by emissions of CH 4, carbon monoxide (CO), nitrogen oxides (NO
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 2011 · The stable isotope ratios of atmospheric CO 2 (18 O/ 16 O and 13 C/ 12 C) have been monitored since 1977 to improve our understanding of the global carbon cycle, because biosphere–atmosphere...
15 lis 2020 · Atmospheric observations of δ13CO2 have been used to investigate carbon fluxes and the functioning of plants, and they are used for comparison with δ13C in other materials such as tree rings.
This review focuses on the kinetic and photolysis isotope effects relevant to understanding the isotope compositions of atmospheric ozone, carbon dioxide, methane, nitrous oxide, and other gases and their historical context.
