Dust deposition to the East China Sea and its biogeochemical implications
Dust deposition to the East China Sea and its biogeochemical implications
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DOI：
10.1029/2008jd011223
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发表时间：
2009-08
影响因子：
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通讯作者：
S. Hsu;S. Liu;R. Arimoto;T. Liu;Yi-Tang Huang;F. Tsai;F. Lin;S. Kao
中科院分区：
文献类型：
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作者：
S. Hsu;S. Liu;R. Arimoto;T. Liu;Yi-Tang Huang;F. Tsai;F. Lin;S. Kao
[1]利用Hsu等人（2008）发表的大气Al浓度和质量粒径分布（MSD）的新信息计算台湾北方的沙尘沉降，并评估该过程对东海的重要性。台湾北方气溶胶Al的季节变化表现为春、冬两季最大，夏、秋两季最小。Al和Fe的MSD是单峰的，平均质量中值直径为3.6 ± 1.2 μm，在整个MSD上积分的干沉积速度为2.0 ± 1.5 cm s−1。ECS的估计尘埃沉降量为200 g m−2 a−1，湿沉降量占总量的四分之三。沉积的尘埃量随离源区的距离呈指数下降。整个ECS的年粉尘输入量估计为1.17亿吨，与河流排放量相比，粉尘沉积似乎是沉积物和溶解铁的重要来源。沉积的大量灰尘也可能对Fe（和Al）的地球化学循环产生重大影响，包括对浮游植物种群的影响。
[1] Atmospheric Al concentrations published by Hsu et al. (2008) are used together with new information on mass particle-size distributions (MSDs) to calculate dust deposition to northern Taiwan and to evaluate the significance of the process for the East China Sea (ECS). Seasonal variations in aerosol Al in northern Taiwan show maxima in spring and winter and minima in summer and fall. The MSD of Al and Fe is monomodal, with a mean mass median diameter of 3.6 ± 1.2 μm, and the dry deposition velocity integrated over the entire MSD is 2.0 ± 1.5 cm s−1. The estimated dust deposition to the ECS is ∼20 g m−2 a−1, with wet deposition accounting for three fourths of the total. The quantity of dust deposited decreases exponentially with distance from the source regions. The annual dust input to the entire ECS is estimated to be ∼17 Mt, and when compared with riverine discharge, dust deposition appears to be a significant source of sediments and dissolved Fe. The large quantities of dust deposited also could have significant implications for the biogeochemical cycling of Fe (and Al), including effects on phytoplankton populations.