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GEOTRACES

机译:地理轨迹

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摘要

Since the late 1990s there has been a growing impetus for a comprehensive global study of the marine biogeochemi-cal cycles of trace elements and their isotopes (TEIs). This has led to the development of a research program known as GEOTRACES. GEOTRACES is motivated by the fact that TEIs play critical roles in many aspects of oceanography, and by the incompleteness of our understanding of their marine biogeochemical cycles. Better knowledge of the distribution and behavior of TEIs in seawater will provide insights into a wide range of oceanic processes. It will provide, for example, understanding of the role that micro-nutrients play in regulating ecosystem structure and productivity and will elu- cidate the mechanisms that control the fate of pollutants in the oceans. Some TEIs, particularly radionuclides, constrain rates of key processes regulating the carbon cycle. Other TEIs can be used to study mixing processes in the ocean on time scales not amenable to direct observation. TEI distributions in marine sediments provide many of the proxies used to reconstruct past environmental conditions (e.g., productivity, circulation, ecosystem structure, weathering, hydrothermal activity, anoxia).
机译:自1990年代后期以来,对海洋生物大地微量元素及其同位素(TEIs)循环进行全面研究的动力越来越强。这导致了开发名为GEOTRACES的研究计划。 GEOTRACES的动机是TEI在海洋学的许多方面都发挥着至关重要的作用,以及我们对海洋生物地球化学循环的理解不全面。更好地了解TEI在海水中的分布和行为,将提供对广泛海洋过程的见识。例如,它将提供对微量营养素在调节生态系统结构和生产力中所起的作用的了解,并将消除控制海洋污染物命运的机制。一些TEI,特别是放射性核素,限制了调节碳循环的关键过程的速率。其他TEI可以用来研究海洋中的混合过程,其时间尺度不适合直接观测。海洋沉积物中的TEI分布提供了许多用于重建过去环境条件的代理(例如生产力,循环,生态系统结构,风化,热液活动,缺氧)。

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