National Oceanic and
Atmospheric Administration
United States Department of Commerce


FY 2015

Atmospheric histories (1765–2015) for CFC-11, CFC-12, CFC-113, CCl4, SF6 and N2O

Bullister, J.L.

ORNL/CDIAC-161, NDP-095, Carbon Dioxide Information Analysis Center, Oak Ridge National Laboratory, US Department of Energy, Oak Ridge, Tennessee,, doi: 10.3334/CDIAC/otg.CFC_ATM_Hist_2015, Data product at ORNL (2015)

Table 1 contains a listing of mean northern (NH) and southern (SH) hemisphere tropospheric CFC-11, CFC-12, CFC-113, carbon tetrachloride (CCl4), sulfur hexafluoride (SF6) and nitrous oxide (N2O) concentrations for the period 1765.5 to 2015.5. The concentrations are given for the mid-point of each year (e.g. 2013.5) and expressed as the mixing ratio (mole fraction) of the trace gas in dry air. Concentration values are reported in parts-per-trillion (ppt) for CFC-11, CFC-12, CFC-113, CCl4 and SF6 and parts-per-billion (ppb) for N2O. Figs. 1–9 show plots of these data for the NH and the SH during the periods of 1765–2015 and 1920–2015. Figs. 10–11 show fits of ice-core N2O data from 1502–1996 and atmospheric N2O measurement data from 1977–2015, used to generate the N2O concentration values shown in Table 1.

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