| Autor: |
Schwartz, Stephen E, Hua, Quan, Andrews, David E, Keeling, Ralph F, Lehman, Scott J, Turnbull, Jocelyn C, Reimer, Paula J, Miller, John B, Meijer, Harro A J |
| Zdroj: |
Radiocarbon; April 2024, Vol. 66 Issue: 2 p386-399, 14p |
| Abstrakt: |
ABSTRACTObservations of radiocarbon (14C) in Earth’s atmosphere and other carbon reservoirs are important to quantify exchanges of CO2between reservoirs. The amount of 14C is commonly reported in the so-called Delta notation, i.e., Δ14C, the decay- and fractionation-corrected departure of the ratio of 14C to total C from that ratio in an absolute international standard; this Delta notation permits direct comparison of 14C/C ratios in the several reservoirs. However, as Δ14C of atmospheric CO2, Δ14CO2is based on the ratio of 14CO2to total atmospheric CO2, its value can and does change not just because of change in the amount of atmospheric14CO2but also because of change in the amount of total atmospheric CO2, complicating ascription of change in Δ14CO2to change in one or the other quantity. Here we suggest that presentation of atmospheric 14CO2amount as mole fraction relative to dry air (moles of 14CO2per moles of dry air in Earth’s atmosphere), or as moles or molecules of 14CO2in Earth’s atmosphere, all readily calculated from Δ14CO2and the amount of atmospheric CO2(with slight dependence on δ13CO2), complements presentation only as Δ14CO2, and can provide valuable insight into the evolving budget and distribution of atmospheric 14CO2. |
| Databáze: |
Supplemental Index |
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