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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >MASS-PARTICLE SIZE DISTRIBUTIONS OF ATMOSPHERIC DUST AND THE DRY DEPOSITION OF DUST TO THE REMOTE OCEAN
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MASS-PARTICLE SIZE DISTRIBUTIONS OF ATMOSPHERIC DUST AND THE DRY DEPOSITION OF DUST TO THE REMOTE OCEAN

机译：大气尘埃的粒径分布和尘埃对远洋的干沉降

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Size-separated mineral aerosol samples were collected and analyzed to investigate the relationships between the mass-particle size distributions (MSDs) of dust particles and the dust loadings in the atmosphere, The data also were used to assess the changes in the MSDs of dust in relation to transport processes and especially the associated effects on dry deposition. Atmospheric dust concentrations, as indicated by aluminum or scandium, in samples collected from three sites in the remote North Atlantic were higher than those in samples collected during a cruise in the North Pacific on board the R/V Moana Wave. However, the mass median diameters (MMDs) for the North Pacific samples were both larger on average (similar to 3 mu m versus similar to 2 mu m aerodynamic equivalent diameter) and more variable than those from the North Atlantic; this difference was attributed to wet conditions and particle aggregation over the North Pacific. In addition, for the ensemble of all samples the geometric standard deviations of the mass-particle size distributions, which are analogous to the sorting values used to characterize sedimentary materials, tended to vary inversely and nonlinearly with the mass median diameters. Model-derived dry deposition velocities for the samples were at most weakly related to either the dust concentrations or the MMDs. However, the dry deposition velocities for two subsets of samples were correlated with the geometric standard deviations of the distributions; this is further evidence that the mass flux of dust via dry deposition can be controlled by a relatively small fraction of aerodynamically large particles. [References: 48]
机译：收集按尺寸分类的矿物气溶胶样品，并进行分析，以研究尘埃颗粒的粒径分布与大气中尘埃含量之间的关系，该数据还用于评估尘埃中尘埃的MSD的变化。与运输过程有关，特别是对干沉降的影响。以铝或scan表示的从偏远北大西洋三个地点采集的样品中的大气尘埃浓度高于在R / V莫阿纳波浪上北太平洋航行时采集的样品中的尘埃浓度。然而，北太平洋样品的质量中值直径（MMDs）均比北大西洋的平均直径大（近似于3微米，而近似于2微米的空气动力学当量直径），并且变化更大。这种差异归因于北太平洋的潮湿条件和颗粒聚集。另外，对于所有样品的集合，质量-粒度分布的几何标准偏差与用于表征沉积物的分选值相似，倾向于与质量中值直径成反比和非线性变化。样品的基于模型的干沉降速度至多与粉尘浓度或MMD无关。但是，两个子集的样品的干沉降速度与分布的几何标准偏差相关。这进一步证明，可以通过相对较小比例的空气动力学大颗粒来控制通过干沉积产生的粉尘质量通量。 [参考：48]

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