Be, Al, U-Th Series Isotopes in the Ocean

该项目旨在了解铍(10Be、9Be和7Be)和铝(26Al和27Al)在海洋-大气系统中的地球化学行为和分布。这种理解将有助于将这些同位素用作一些海洋学和地球物理问题的时间和过程示踪剂，这些问题包括海洋地质年代学、海洋混合、微粒-痕量元素相互作用、宇宙射线和地磁场强度的变化、尘埃向海洋输送的古强度以及气溶胶行为。正在进行的工作包括研究气溶胶和雨水中的铍同位素，海水及其颗粒物质中的铍同位素，以及沉积物中的孔隙流体。在确定深海中10Be/9Be的同位素均一化分布和程度、评价7Be/10Be地质计时方面的工作仍在继续。将继续努力最后确定/总结成果以供出版。一个考察队将前往中太平洋，研究海洋中的26Al/10Be和7Be系统学。这将是首次尝试测量海水中宇宙成因的26Al。预计研究结果将进一步加强我们利用宇宙成因核素26Al、10Be和7Be用于地球物理和海洋应用的能力。

This project aims at gaining an understanding of the geochemical behavior and distribution of isotopes of beryllium (10 Be, 9Be, and 7Be) and aluminum (26Al and 27Al) in the ocean-atmospheric system. Such an understanding will provide insight for use of these isotopes as time and process tracers for a number of oceanographic and geophysical problems such as marine geochronology, ocean mixing, particulate-trace element interaction, variation of cosmic-ray and geomagnetic field intensity, paleo-intensity of dust transport to the ocean, and aerosol behavior. Work in progress includes studies of Be isotopes in aerosols and rain, in ocean water and its particulate matter, and in sediment pore fluid. Work is continuing in determining the distribution and degree of isotopic homogenization of 10Be/9Be in the deep ocean, in evaluating the 7Be/10Be geochronometry. Continuing efforts will be directed toward the finalization/summarization of results for publication. An expedition will be conducted to the Central Pacific to study the 26Al/10Be and 7Be systematics in the ocean. This will represent the first attempt to measure cosmogenic 26Al in sea water. It is anticipated that the results of the study will further enhance our ability to utilize cosmogenic nuclides 26Al, 10Be and 7Be for geophysical and oceanographic applications.