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23 paź 2020 · In this “Grand Challenges” paper, we review how the carbon isotopic composition of atmospheric CO 2 has changed since the Industrial Revolution due to human activities and their influence on the natural carbon cycle, and we provide new estimates of possible future changes for a range of scenarios.
13 wrz 2023 · Environmental Science. The scientific and wider interest in the relationship between atmospheric temperature (T) and concentration of carbon dioxide ( [CO2]) has been enormous. According to the commonly assumed causality link, increased [CO2] causes a rise in T.
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 paź 2019 · After listing methods of carbon isotope ratio determination and a brief historical retrospect on the interpretation of δ 13 C in paleoceanography, we firstly focus on the abundance and distribution of stable carbon isotopes in the modern ocean and atmosphere. We discuss carbon isotope ratios as tracers in atmospheric carbon dioxide and methane ...
1 sty 2020 · 1. Introduction. In an Anthropocene world, humans are in the process of altering the carbon cycle in a way that is “currently” unprecedented in geologic time (e.g., Hall et al., 2019; Steffen et al., 2020; Woodard et al., 2019).
Protons and neutrons weigh 1 amu each (the mass of electrons is negligible). For instance, the 6 proton carbon atom has three stable, naturally occurring isotopes: carbon-12 ([latex]\ce{_{6}^{12}C}[/latex]), carbon-13 ([latex]\ce{_{6}^{13}C}[/latex]) and carbon-14 ([latex]\ce{_{6}^{14}C}[/latex]), weighing 12, 13 and 14 amu respectively.
17 sty 2018 · We show the effect of pCO2 during the last deglaciation is stronger for gymnosperms (−1.4 ± 1.2‰) than angiosperms/fauna (−0.5 ± 1.5‰), while the contributions from changing MAP are −0 ...
