_____________________________________________________________________________________________

Species | Expected | Present | Total | Output | Residence |
---|---|---|---|---|---|

fractional | fractional | mass | kg yr^{-1} | time | |

equilibrium | concentration | kg | |||

concentration | |||||

N_{2} | < 10^{-10} | 0.78 | 3.9 x 10^{18} | 2.5 x 10^{11} | 1.6 x 10^{7} yr |

CH_{4} | < 10^{-35} | 1.7 x 10^{-6} | 4.8 x 10^{12} | 7.5 x 10^{11} | 6 yr |

N_{2}O | < 10^{-20} | 3 x 10^{-7} | 2.3 x
10^{12} | 1 x 10^{11} | 20 yr |

NH_{3} | < 10^{-35} | 10^{-9} | 3.0 x 10^{9} | 1 x
10^{11} | 10 days |

H_{2} | < 10^{-35} | 5.3 x 10^{-7} | 1.9 x 10^{11} | 5 x 10^{10} | 4 yr |

____________________________________________________________________________________________

Adapted from: Richard P. Wayne, 1985: *Chemistry of Atmospheres*. Clarendon Press, Oxford. 361 pp.

Notes:

Mass of the atmosphere: 5.14 x 10^{18}kg.

Kmols in the atmosphere: 1.78 x 10^{17}

Number of molecules in the atmosphere: 1.07 x 10^{44}