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13 wrz 2023 · According to the commonly assumed causality link, increased [CO2] causes a rise in T. However, recent developments cast doubts on this assumption by showing that this relationship is of the hen-or-egg type, or even unidirectional but opposite in direction to the commonly assumed one.
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).
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.
24 cze 2016 · We compare the carbon isotopic values of egg protein (albumen) and eggshell carbonate of hens fed on carnivorous, omnivorous and herbivorous diets. Subsequently, we extrapolate results from our egg data to examine the effect of differences in dietary composition on the spacing between bone collagen and bone bioapatite carbon isotopic values.
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.
1 lut 1997 · In this model, isotopic composition of an internal DIC pool is determined by the rates of photosynthesis (P), respiration (R), skeletogenesis (S), carbon uptake from solution (I), carbon efflux to solution (O), and the isotopic fractionations associated with these processes: 1 - O = P - R + S I(bEnv) O(UPool) - P(UPhoto) R(vRe,p) + S(USkeleton ...
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...
