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

本项目旨在了解海洋-大气系统中铍（10be、9Be和7Be）和铝（26Al和27Al）同位素的地球化学行为和分布。这样的理解将为使用这些同位素作为时间和过程示踪剂来解决许多海洋学和地球物理问题提供见解，如海洋地质年代学、海洋混合、颗粒-微量元素相互作用、宇宙射线和地磁场强度的变化、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、海水及其颗粒物质和沉积物孔隙流体中的Be同位素。在确定深海中10Be/9Be的分布和同位素均匀化程度，以及评价7Be/10Be的地质年代学方面的工作仍在继续。将继续努力最后定稿/总结结果以供出版。探险队将前往中太平洋，研究海洋中的26Al/10Be和7Be系统。这将是首次尝试测量海水中的宇宙成因铝。预计研究结果将进一步提高我们利用宇宙核素26Al、10Be和7Be在地球物理和海洋学上的应用能力。

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.