Exploiting the GEOTRACES toolbox to characterize ocean biogeochemical processes: trace elements, isotopes and new quasi-conservative tracers.

当前环境研究的主要目标之一是深入了解地球气候，特别是气候、海洋和大气环流模式与碳循环之间的复杂反馈机制。显然，海洋可以通过其高的热容量、(通过洋流、海冰)散热的能力和生物地球化学循环(与大气的气体交换、生物吸收和再矿化)影响气候。因此，记录和了解海洋中的现代生物地球化学循环对于揭示海洋在过去气候变化中的作用和了解人为全球变暖对海洋环境的潜在威胁至关重要。该项目将针对大西洋、南太平洋和太平洋的各种GEOTRACES邮轮的海水、海洋颗粒物和气溶胶样本和数据。GeoTraces(www.Geotraces.org)是对全球海洋生物地球化学循环中的微量元素及其同位素进行的国际研究。其任务是确定控制海洋中关键微量元素和同位素分布的过程和通量，并确定这些分布对不断变化的环境条件的敏感性。通过加入这个项目，你将成为一个大型国际项目的一部分，并致力于解释或测量来自世界各地实验室的样品。对微量元素和同位素海洋循环的定量理解落后于对主要营养物质碳和氧的理解。然而，微量元素在海洋生态系统中发挥着基本作用，提供了关于内陆和海洋边界各种时间和空间尺度上的过程的重要信息，并且具有日益受到人类活动干扰的循环。该项目的总体目标是利用国际地质研究计划提供的不断增长的数据集，对生物地球化学中的微量元素和同位素示踪剂产生新的理解，以揭示和量化关键和不断演变的源(如粉尘、河流、沉积物)和生物地球化学梯度(如氧、pH、盐度、您还可以使用伦敦帝国理工学院(http://www.imperial.ac.uk/earth-science/research/research-groups/magic/)地球科学与工程系MAGIC实验室的净化室和质谱分析设施，根据需要执行各种测量。该项目还可能包括参与实地考察和一次收集样本的研究巡航。

One of the key targets in current environmental research is an advanced understanding of Earth's climate, in particular the complex feedback mechanisms between climate, oceanic and atmospheric circulation patterns, and the carbon cycle. It is clear that the ocean can affect climate through its high heat capacity, the ability to distribute heat (through ocean currents, sea ice), and biogeochemical cycling (exchange of gases with the atmosphere, biological uptake and remineralisation). Documenting and understanding modern biogeochemical cycles in the ocean is therefore critical for unravelling the ocean's role in past climate change and understanding potential threats to the marine environment byanthropogenic global warming.The project will target seawater, marine particulate, and aerosol samples and data from various GEOTRACES cruises in the Atlantic, Southern and Pacific Ocean. GEOTRACES(www.geotraces.org) is an international study of the global marine biogeochemical cycles of trace elements and their isotopes. Its mission is to identify processes and quantify fluxes that control the distributions of key trace elements and isotopes in the ocean, and to establish the sensitivity of these distributions to changing environmental conditions. By joining this project, you will be part of a large international project and work on the interpretation or measurement of samples that originate from laboratories around the world.Quantitative understanding of the oceanic cycling of trace elements and isotopes lags that of the major nutrients, carbon and oxygen. Yet, trace elements play fundamental roles in themarine ecosystems, provide significant information about processes on a variety of time and space scales in the interior and at ocean boundaries, and have cycles that are increasinglyperturbed by human activity.The overall objective of this project is to exploit the growing dataset provided by the international GEOTRACES programme to develop new understanding of trace elements and isotopic tracers in biogeochemistry to reveal and quantify the influence of key and evolving sources (e.g. dust, rivers, sediments) and biogeochemical gradients (e.g. oxygen, pH,salinity, temperature) on the cycling of elements and elemental stoichiometry in the ocean.You will also be able to use the clean room and mass spectrometry facilities of the MAGIC Laboratories at the Department of Earth Science & Engineering, Imperial College London (http://www.imperial.ac.uk/earth-science/research/research-groups/magic/) to perform a variety of measurements as required. The project may also include participation in fieldwork and a research cruise to collect samples.