Historical Fluxes of Pollutants from Deconvolution of Sedi- mentary Records

这个项目是一个更新的一个下发起的国家科学基金会赠款 第87-01184号，以制定回收 污染物的历史输入记录， 从湖泊沉积物中提取沉积物。在 该先前的工作，频域反卷积方法， 的开发，以提取这些类型的过去输入通量 污染物的沉积记录。 污染物 感兴趣的包括铅、锌、镉、多氯 联苯和多环芳烃。 这 更新将允许加强实验 以前开发的多环化合物分析方法 芳香族碳氢化合物和γ-辐射 放射性示踪剂铯-137 与颗粒有关的污染物的沉积物可以 提供有价值的信息用于设计 环境模型及其验证。 然而，在这方面， 这些记录往往是对过去的歪曲反映， 通量，因为各种物理，化学和 生物环境过程， 在沉积期间和沉积后受到的影响。 这些过程包括混合，生物降解， 放射性衰变和压缩。 该项目具有 获得比现在更多信息的潜力 可能来自对沉积物的分析。 这 反过来可能证明在验证气候模型方面是有用的 和水文过程，因为它们与污染物 沉积在美国沿海地区。

This project is a renewal of one initiated under NSF Grant No. 87-01184 to develop methods for recovery of the historical input record of pollutants from analysis of sedimentary deposits obtained by coring lake sediments. In this prior work, a frequency domain deconvolution method was developed to extract past input fluxes of these types of pollutants from their sedimentary record. Pollutants of interest include lead, zinc, cadmium, polychlorinated biphenyls and polycyclic aromatic hydrocarbons. This renewal will permit enhancement of the experimental methods developed previously for analysis of polycyclic aromatic hydrocarbons and for the gamma-emitting radioactive tracer Cesium-137. Sedimentary deposits of particle-associated pollutants can provide valuable information for use in devising environmental models and in their validation. However, these records are often distorted reflections of past fluxes because of the variety of physical, chemical and biological environmental processes to which the particles are subjected during and following their deposition. These processes include mixing, biodegradation, radioactive decay and compaction. This project has the potential for obtaining more information than is now possible from an analysis of sedimentary deposits. This in turn may prove useful in validating models of climate and hydrological processes as they relate to pollutant deposition in coast regions of the United States.