Marine Geochemical Studies with Beryllium and U-Th Series Isotopes

将继续进行铍的地球化学调查，其中包括研究气溶胶、雨、海洋、河流和河口水域及其微粒物质和海洋沉积物中的be同位素。将特别注意：确定了10Be/9Be在深海中的分布和同位素均一化程度，评价了7Be/10Be比值作为海洋过程示踪剂的作用，探索了孔隙水9Be作为10Be地质年代学归一化参数的应用；用7Be/10Be和U/Th系列同位素的多示踪剂研究海洋表面非稳态元素去除。计划的现场收集包括南大西洋水柱10Be/9Be研究，洛杉矶大气7Be/10Be研究，以及南加州圣佩德罗盆地的Be和U-Th系列同位素研究。本项目旨在了解铍同位素（10Be、9Be和7Be）在海洋-大气系统中的地球化学行为和分布。这样的理解将为一些海洋学和地球物理问题提供见解并促进使用这些同位素作为示踪剂，例如过去1500万年海洋沉积物的地质年代学、海洋混合、颗粒通量、微量元素清除、宇宙射线和地磁场强度的变化。

Geochemical investigations of beryllium will be continued that include studies of Be isotopes in aerosols, in rain, in ocean, river and estuarine waters and their particulate matter, and in marine deposits. Particular attention will be paid to: determining the distribution and degree of isotopic homogenization of 10Be/9Be in the deep ocean, evaluating the 7Be/10Be ratio as a tracer of oceanic process, exploring the use of pore water 9Be as an normalization parameter for the 10Be geochronometry, and studying non-steady state elemental removal in surface ocean with multiple tracers of 7Be/10Be and U/Th series isotopes. Planned field collections include water column 10Be/9Be study in the S. Atlantic, atmospheric 7Be/10Be study in Los Angeles, and Be and U-Th series isotope study in the San Pedro Basin off Southern California. This project aims at gaining an understanding of the geochemical behavior and distribution of the isotopes of beryllium (10Be, 9Be, and 7Be) in the ocean-atmospheric system. Such an understanding will provide insight and facilitate the use of these isotopes as tracers for a number of oceanographic and geophysical problems such as geochronology of marine deposits for the past 15 million years, ocean mixing, particulate flux, trace element scavenging, variation of cosmic-ray and geomagnetic field intensity.