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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.
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).
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 ...
29 paź 2023 · We resolve analytical issues and present new carbon isotope ratios of CO 2 in single fluid inclusions with an error better than 2.5‰ (all errors are 1σ unless stated otherwise), providing a...
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.
19 mar 2021 · The objectives for this work were to design and execute experiments to determine if carbon- or oxygen-isotope fractionation occurs when sampling CO 2 gas from single-, supercritical-, and dual-phase compressed gas cylinders stored at different temperatures.
Carbon isotope compositions are measured on CO 2 gas using isotope ratio mass spectrometry (IRMS). The CO 2 sample is prepared from natural materials using various extraction techniques. Carbonates are reacted with >100% H 3 PO 4 at a specified temperature between 25°C and 100°C (Wachter and Hayes, 1985; Rosenbaum and Sheppard, 1986).
