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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Iodine speciation and deposition fluxes from the marine atmosphere
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Iodine speciation and deposition fluxes from the marine atmosphere

机译：海洋大气中的碘形态和沉积通量

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The concentration and speciation of iodine have been determined in wet and dry deposition at a coastal site over a 15-month period. Deposition fluxes in rain (2.7 mu mol m(-2) yr(-1)) and aerosol (3.6-6.5 mol m(-2) yr(-1)) are the major routes for removal of iodine from the marine atmosphere onto the Earth's surface, with only a minor contribution from direct deposition of methyl iodide (0.003-0.17 mu mol m(-2) yr(-1)). Iodate (IO3-) is often considered to be the only species of iodine that is permanently removed to the aerosol phase, and IO3- may therefore be expected to be the dominant form of iodine in precipitation. However, iodide (I-) was found to constitute a significant fraction (5-100%) of iodine in both rain and aerosol. This implies that the rates of iodate formation and iodide volatilization (through reaction with hypohalous acids) are relatively slow. A third pool of aerosol iodine (nonvolatile organic compounds) may also contribute to removal of iodine from the atmosphere in dry or wet deposition. [References: 35]
机译：在15个月的时间内，已经确定了沿海地区湿法和干法沉积物中碘的浓度和形态。在雨中（2.7μmol m（-2）yr（-1）和气溶胶（3.6-6.5 mol m（-2）yr（-1））中的沉积通量是从海洋大气中去除碘到大气中的主要途径地球表面，只有少量的碘甲烷直接沉积（0.003-0.17摩尔mol m（-2）yr（-1））。碘化物（IO3-）通常被认为是唯一一种永久性地被清除到气溶胶相中的碘，因此可以预期IO3-是降水中碘的主要形式。但是，在雨水和气溶胶中，碘化物（I-）被发现占碘的很大一部分（5-100％）。这意味着碘酸盐形成和碘化物挥发的速率（通过与次卤酸反应）相对较慢。第三次气溶胶碘（非挥发性有机化合物）也可能有助于在干式或湿式沉积过程中从大气中除去碘。 [参考：35]

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