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- W2078003642 abstract "Radioactive carbon-14 monoxide produced by cosmic ray neutrons provides a useful tracer to deduce the residence time of carbon monoxide in the troposphere. From the steady-state equations for stable carbon monoxide and radioactive carbon monoxide, the production rate of stable carbon monoxide can also be derived. This rate is an order of magnitude greater than that estimated for CO sources such as the oceans, combustion, and chlorophyll decay. The oxidation of tropospheric methane initiated by hydroxyl radicals has been postulated to account for this predominant source of CO in nature. Estimates of the steady-state hydroxyl radical concentration in the troposphere are of sufficient magnitude to support this possibility. Furthermore, the hydroxyl radical can also provide the major removal mechanism for carbon monoxide by oxidation to CO<sub>2</sub> to maintain the carbon monoxide balance in nature. A critical review of the above theories is given, and some possibilities for experimental verification are discussed. The earlier computations are modified to refer to the northern troposphere in view of differences recently found for CO concentrations in the northern and southern troposphere. Observations of the stable isotope composition of methane, <sup>12</sup>CH<sub>4</sub> and 13CH<sub>4</sub>, and of carbon monoxide, <sup>12</sup>C<sup>16</sup>O, <sup>13</sup>C<sup>16</sup>O, and <sup>12</sup>C<sup>18</sup>O are also of significance to the proposed theory for the carbon monoxide balance. These data will be reviewed and discussed in terms of kinetic isotope effects in the reaction sequence, CH<sub>4</sub> to CO to CO<sub>2</sub>. The results of this analysis of the stable CO isotope data will be shown to be consistent with the conclusions drawn from the analysis of the radiocarbon data." @default.
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- W2078003642 date "1974-01-01" @default.
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- W2078003642 title "The global balance of carbon monoxide" @default.
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- W2078003642 doi "https://doi.org/10.3402/tellusa.v26i1-2.9742" @default.
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