The Biogeochemical Cycling of Atmospheric Trace Elements and Mineral Aerosol Over Central and Eastern Asia

拟议的研究将继续为中国和美国海气实验进行的研究。通过地面采样收集的气溶胶颗粒进行了分析(1)以确定空气中颗粒物的自然和人为成分，(2)调查大气粉尘浓度的时间变异性和造成浓度差异的气象条件，以及(3)估计与东亚接壤水域的矿物气溶胶和选定的微量元素的大气沉降率。新的倡议将集中在土壤的大气输送上，因为它与全球气候变化有关，当代气溶胶颗粒的化学作用将与中国的黄土进行比较和对比。单个气溶胶粒子的形态和化学将通过配备微型分析器的扫描电子显微镜进行研究，并将这些数据与级联撞击器获得的质量-粒子尺寸分布进行比较。将使用x射线衍射仪对选定的黄土和气溶胶样品进行分析，以确认单个颗粒分析和进行比较矿物学研究。最后，单个颗粒的化学数据将被用来评估矿物粉尘和人为物质之间的某些化学反应。

The proposed studies will continue research undertaken for the China and America Air/Sea Experiments. Aerosol particles collected through ground-based sampling are analyzed (1) to determine the natural and anthropogenic components of the airborne particulate material, (2) to investigate the temporal variability in atmospheric dust concentrations and the meteorological conditions responsible for the concentration differences, and (3) to estimate the atmospheric deposition rates of mineral aerosol and selected trace elements to the waters bordering eastern Asia. New initiatives will focus on the atmospheric transport of soils as it relates to global climatic change, and the chemistry off contemporary aerosol particles will be to compared and contrasted with that of loess from China. The morphology and chemistry of individual aerosol particles will be investigated through the use of a scanning electron microscope equipped with a microanalyzer, and these data will be compared with the mass-particle size distributions obtained with cascade impactors. Selected loess and aerosol samples will be analyzed using x-ray diffractometry for confirmation of the individual particle analyses and for comparative mineralogical studies. Finally, the chemical data for the individual particles will be used to evaluate certain chemical reactions between the mineral dust and anthropogenic substances.