Quantifying the contribution of marine organic gases to atmospheric iodine
Quantifying the contribution of marine organic gases to atmospheric iodine
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DOI：
10.1029/2010gl043990
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发表时间：
2010-09-18
影响因子：
5.2
通讯作者：
Carpenter, Lucy J.
中科院分区：
文献类型：
--
作者：
Jones, Charlotte E.;Hornsby, Karen E.;Carpenter, Lucy J.
气态有机碘原子前体的海洋排放有可能对大气化学和气候产生重大影响，但目前对其来源的量化存在相当大的不确定性。我们提出了海-气通量计算的同时空气和海水测量的挥发性有机碘化合物（VOIC），包括CH 3 I和不太常见的二卤甲烷CH 2 ICl，CH 2 IBr和CH 2 I2，在两个巡航期间在大西洋15-58度之间。组合的二卤甲烷通量提供了与CH 3 I相当的全局碘源（类似于0.33 +/-0.19 Tg I y（-1）），以及高3-4倍的表面碘原子源。然而，一维大气模型显示，在佛得角附近的热带东大西洋，即使这些合并的VOIC通量也只能支持观测到的IO水平的10-25%，并表明需要大量（340-640 nmol I m（-2）d（-1））的额外光化学碘源。引用：Jones，C. E、K. E.霍恩斯比河索马里瓦河M.敦克河vonEschow，G. McFigans和L. J. Carpenter（2010年），《海洋有机气体对大气碘的贡献的量化》，地球物理学。保留信函：37，L18804，doi：10.1029/2010GL043990。
Oceanic emissions of gaseous organic iodine-atom precursors have the potential to significantly affect atmospheric chemistry and climate, however there is currently considerable uncertainty associated with quantifying their sources. We present sea-air fluxes calculated from simultaneous air and seawater measurements of a comprehensive range of volatile organic iodine compounds (VOICs), including CH3I and the less commonly reported dihalomethanes CH2ICl, CH2IBr and CH2I2, made during two cruises in the Atlantic Ocean between 15-58 degrees N. The combined dihalomethane flux provides a global iodine source (similar to 0.33 +/- 0.19 Tg I y(-1)) comparable to that of CH3I, and a surface iodine atom source 3-4 times higher. However, a 1D atmospheric model reveals that, in the tropical east Atlantic Ocean in the vicinity of Cape Verde, even these combined VOIC fluxes are capable of supporting only similar to 10-25% of the observed IO levels, and suggests that a substantial (340-640 nmol I m(-2) d(-1)) additional photochemical source of iodine is required. Citation: Jones, C. E., K. E. Hornsby, R. Sommariva, R. M. Dunk, R. von Glasow, G. McFiggans, and L. J. Carpenter (2010), Quantifying the contribution of marine organic gases to atmospheric iodine, Geophys. Res. Lett., 37, L18804, doi: 10.1029/2010GL043990.