Tropospheric aerosol impacts on trace gas budgets through photolysis

Huisheng Bian, Michael J. Prather, Toshihiko Takemura

    研究成果: ジャーナルへの寄稿学術誌査読

    41 被引用数 (Scopus)

    抄録

    Aerosols affect the global budgets Of O3, OH, and CH4 in part through their alteration of photolysis rates and in part through their direct chemical interactions with gases (i.e., "heterogeneous chemistry"). The first effect is evaluated here with a global tropospheric chemistry transport model using recently developed global climatologies of tropospheric aerosols: a satellite-derived aerosol climatology over the oceans by advanced very high resolution radiometer and a model-generated climatology for land plus oceans by the Center for Climate System Research. Globally averaged, the impact of aerosols on photolysis alone is to increase tropospheric O3 by 0.63 Dobson units and increase tropospheric CH4 by 130 ppb (via tropospheric OH decreases of 8%). These greenhouse gas increases lead to an aerosol indirect effect (counting both natural and anthropogenic aerosols) of +0.08 W/m2 . Although the CH4 increases are, of course, global, the changes in tropospheric OH and O3 are mainly regional, with the largest impacts in northwest Affica for January and in India and southern Affica for July. The influence of aerosols is greater in July than in January and greater in the Northern Hemisphere than in the Southern Hemisphere, as expected given the pollution sources in the Northern Hemisphere. The predominant impact is due to the aerosols over land; aerosols over the ocean contribute less than a third to globally integrated changes.

    本文言語英語
    ページ(範囲)ACH 4-1 - ACH 4-10
    ジャーナルJournal of Geophysical Research: Atmospheres
    108
    8
    DOI
    出版ステータス出版済み - 4月 27 2003

    !!!All Science Journal Classification (ASJC) codes

    • 地球物理学
    • 林業
    • 海洋学
    • 水圏科学
    • 生態学
    • 水の科学と技術
    • 土壌科学
    • 地球化学および岩石学
    • 地表過程
    • 大気科学
    • 地球惑星科学(その他)
    • 宇宙惑星科学
    • 古生物学

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