Seasonal Variation of Trace Elements in the Arabian Sea: The Impact of Eolian Deposition and Biological Cycling

在美国jgofs阿拉伯海过程研究期间，研究人员将在整个阿拉伯海的许多站点确定溶解的铁、铝、锰、硒和铍的浓度。由于它们不同的化学性质，这些金属可以用作各种生物、地球化学和水文过程的指示物。它们在生物学上也很有趣，因为，除了铍，它们是海洋生物群所需要的，但在海水中的含量却很低；特别是，最近在美国jgofs的其他研究中，铁被认为是远离大陆的海洋生产的限制性营养物质。利用季节性季风引发的促进阿拉伯海初级生产的环境条件这一事实，研究人员希望研究从周围陆地块通过季风以气溶胶形式输送到阿拉伯海的微量金属的数量、命运和生物影响。他还将研究AS水柱中的季节性低氧条件如何影响痕量金属反应以及区域水文与痕量金属地理分布之间的关系。从长远来看，PI希望这项研究将为我们了解全球碳循环背景下的痕量金属/生物/水文关系提供信息。* * *

9310943 Measures The investigator will determine the concentrations of dissolved iron, aluminum, manganese, selenium, and beryllium at numerous stations throughout the Arabian Sea during the U.S.JGOFS Arabian Sea Process Study. Because of their different chemistries, these metals can be used as indicators of various biological, geochemical, and hydrographic processes. They also are interesting biologically, because, with the exception of beryllium, they are required by marine biota and yet are present at very low levels in ocean water; in particular, iron has been recently implicated in other U.S.JGOFS studies as a limiting nutrient for oceanic production far from the continents. Taking advantage of the fact that the seasonal monsoons trigger environmental conditions promoting primary production in the Arabian Sea, the investigator expects to study the quantity, fate, and biological impact of trace metals delivered from the surrounding land masses to the Arabian Sea in aerosol form by the monsoon winds. He will also study how seasonal low-oxygen conditions in the AS water column affects trace metal reactions and the relationship between regional hydrography and trace metal geographic distribution. In the long term, the PI expects that this study will inform our understanding of trace metal/biological/hydrological relationships in the context of the global carbon cycle. ***