Hartwell S Ian
NOAA/NOS/NCCOS, Center for Coastal Monitoring and Assessment, 1305 East West Hwy, Silver Spring, MD 20910, USA.
Mar Environ Res. 2008 Apr;65(3):199-217. doi: 10.1016/j.marenvres.2007.10.004. Epub 2007 Nov 7.
Sediment samples were collected to delineate the distribution of contaminants along the central California coast. Sampling included a variety of Canyons and shelf/slope areas to evaluate contaminant transport patterns and potential delivery to Canyons and the continental slope to a depth of 1200 m. Sediments were collected and analyzed for organic contaminants using standard techniques of the NOAA National Status and Trends Program (NS&T). DDT is distributed on the shelf within a zone of fine-grained sediments between Half Moon and Monterey Bays. DDT was found at higher concentrations in Ascension, Año Nuevo, and Monterey/Soquel Canyons than in Pioneer and Carmel Canyons, the Gulf of the Farallones, or the continental slope. The Monterey Bay watershed appears to be the primary source of DDT. In contrast, PAHs and PCBs on the shelf appear to be derived primarily from San Francisco Bay. DDT appears to be delivered to the deep ocean via the Canyons more than from cross-shelf sediment transport. Sediment budget estimates for the continental shelf north of Monterey Bay need further refinement and more data to account for the movement of material from Monterey Bay onto the shelf.
采集沉积物样本以描绘加利福尼亚州中部海岸沿线污染物的分布情况。采样涵盖了多个峡谷以及陆架/陆坡区域，以评估污染物的输送模式以及向峡谷和大陆坡至1200米深度的潜在输送情况。采用美国国家海洋和大气管理局国家状况与趋势计划（NS&T）的标准技术收集沉积物并分析其中的有机污染物。滴滴涕分布在半月湾和蒙特雷湾之间细粒沉积物区域的陆架上。在阿森松、阿诺纽沃和蒙特雷/索克尔峡谷中发现的滴滴涕浓度高于先锋峡谷、卡梅尔峡谷、法拉隆湾或大陆坡。蒙特雷湾流域似乎是滴滴涕的主要来源。相比之下，陆架上的多环芳烃和多氯联苯似乎主要源自旧金山湾。滴滴涕似乎更多地是通过峡谷输送到深海，而非通过陆架沉积物的横向输送。蒙特雷湾以北大陆架的沉积物收支估算需要进一步完善，并获取更多数据以说明物质从蒙特雷湾向陆架的移动情况。
