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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.
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 ...
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).
So, we know that the ratio of carbon isotopes in atmospheric carbon dioxide samples is from a mixture of sources, and we also know the unique isotopic fingerprint of each of those sources. Using these two pieces of information, scientists can figure out why trends in Δ 14 C and δ 13 C occur.
1 sty 2004 · Isotopic analyses of CO 2 and CH 4 provide key tools for better understanding global budgets of these trace gases. This chapter discusses two different methods for measuring carbon and oxygen isotopes in atmospheric CO 2 and a method for measuring carbon isotopes in atmospheric CH 4.
Pools with relatively more 13 C (less 12 C) are called “heavy” and those with less 13 C are called “light”. Let's look at the four main carbon pools with which climate scientists are concerned: the atmosphere, the terrestrial biosphere (land plants, animals, and soils), fossil fuels, and the ocean.
26 lut 2016 · Interval C (71.4–49.4 kyr B.P., see Figure 5) is characterized by the most pronounced variations in δ 13 C(atm) during the last glacial and can be divided into seven subintervals defined by points at which the trend in [CO 2] changes.
