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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).
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.
26 lut 2016 · Key Points. First complete record of atmospheric δ13 C of CO 2 155 kyr B.P. to present. Quantification of the effect of the marine biological soft-tissue pump on [CO 2] at the MIS 5-4-3 transitions. Transfer of isotopically light C to the deep ocean at the onset of MIS 4.
14 mar 2016 · We identify four major patterns of variability of the carbon cycle spanning the length of our record: (i) a millennial-scale increase in CO 2 and decrease in δ 13 C-CO 2 during the early part of Heinrich Stadial 1 (17.6–15.5 ka); (ii) rising CO 2 with generally increasing δ 13 C-CO 2 during the later portion of Heinrich Stadial 1 (15.5–14 ...
29 paź 2023 · Measuring the carbon stable isotope ratio (13C/12C, expressed as δ13CCO2) in geogenic CO2 fluids is a crucial geochemical tool for studying Earth's degassing.
