Variability of Pb, Pb Isotopes, and Fe in the Tropical and Subtropical North Atlantic and North Pacific Oceans

麻省理工学院的一位科学家将继续努力了解人为铅在海洋环境中的扩散，并促进我们对海洋铁的认识。为努力了解人为铅的扩散，将进行以下研究：(1)继续自动系泊在百慕大和夏威夷附近的时间序列，分析南大西洋深海的铅同位素比值；(2)参加前往热带大西洋西北部的邮轮，以确定上北大西洋深水极大值是如何形成的；(3)分析1998-2003年采集的北大西洋地表水样品和冰岛以南CLIVAR断面采集的样品，以确定相对于1981-1984年和1985-1989年，铅的表面分布是如何变化的；(4)对1880年以来的百慕大珊瑚进行铅分析，以评估高的206/207和208/207铅同位素是峰值还是稳定的。此外，为进一步加深我们对海洋铁的认识，海洋铁质局计划继续进行百慕大和夏威夷表层总铁值的高分辨率时间序列，分析北大西洋西部主要海盆的铁的垂直剖面，以获取0.4um和0.2um的铁，并完成海洋样品中铁的稳定同位素勘察。

ABSTRACTOCE-0326689A scientist from Massachusetts Institute of Technology will continue the effort of understanding the dispersal of anthropogenic Pb in the marine environment and advance our knowledge of oceanic Fe. To pursue the effort of understanding the dispersal of anthropogenic Pb, the following studies will be carried out: (1) continue the automated moored time series near Bermuda and Hawaii and analyze samples from the deep South Atlantic for Pb isotopic ratios; (2) participate in a cruise to the North Western Tropical Atlantic to determine how the Upper North Atlantic Deep Water maximum is developed; (3) analyze surface water samples from the North Atlantic collected between 1998-2003 and samples collected during the CLIVAR section south of Iceland to establish how the surface distribution of Pb has changed relative to 1981-1984 and 1985-1989; and (4) analyze a Bermuda coral for Pb back to 1880 to assess whether high 206/207 and 208/207 Pb isotopes are a peak or are stable. In addition, to further our knowledge on oceanic Fe, the PI plans to continue the high-resolution time-series of surface total Fe values at Bermuda and Hawaii and analyze vertical profile for Fe from the major western North Atlantic basins for 0.4 um and 0.2 um Fe, as well as complete an iron stable isotope reconnaissance for Fe in marine samples.