Temporal Variability of Pb, Fe, and Al in the Subtropical North Atlantic and North Pacific Oceans

由于元素浓度在时间上的巨大变化，以及我们在相对不频繁的采样航次上收集样本的能力有限，对上层海洋生物地球化学过程的研究往往受到阻碍。这对于既具有高度可变的风成源又参与真光区的生物过程的痕量元素来说尤其重要。PI，Boyle，建议使用一种新型的系泊原位痕量元素采样器(MITESS)来采集高频痕量金属样品，来研究铅、铁和铝的时间变异性问题。铅的人为来源正在减少，这一长期趋势引起了PI和环境科学界的兴趣。铁被认为是一种基本的微量营养素，铁循环目前引起了科学家们的极大兴趣，他们正在了解现在和过去的海洋生产力以及海洋在全球碳循环中的作用。正在对铝进行研究，以支持铅和铁的工作，因为它是天然风成源(即尘埃)和清除过程的示踪剂。采样将与百慕大大西洋时间序列站点(BATS)和夏威夷海洋时间序列站点(HTS)正在进行的系泊和生物地球化学项目一起进行。因此，这项微量金属研究的结果可以在同时进行的生物地球化学速率测量和物理和光学研究的范围内加以解释，并与百慕大的时间序列大气采样相结合。可以预期，这些独特样品集的收集及其在正在进行的计划的背景下的解释将导致我们在理解痕量金属循环、生物可利用性、金属对生物生长的影响以及海洋中人为痕量金属的命运方面取得许多进展。

Studies of biogeochemical processes in the upper ocean are often hampered by the large temporal variations in elemental concentrations and our limited ability to collect samples on relatively infrequent sampling cruises. This is particularly important for trace elements which have both a highly variable eolian source and are involved in biological processes in the euphotic zone. The PI, Boyle, proposes to examine the issue of the temporal variability of Pb, Fe and Al using a novel moored in-situ trace element sampler (MITESS) to collect high frequency trace metal samples. Pb has an anthropogenic source that is decreasing, and this long term trend is of interest to the PI and the environmental sciences community. Fe is thought to be an essential micronutrient and the Fe cycle is currently of great interest to scientists involved in understanding present and past ocean productivity and the role of the oceans in the global carbon cycling. Al is being studied to support the Pb and Fe work, as it acts as a tracer of natural eolian sources (i.e. dust) and scavenging processes. Sampling would take place in conjunction with ongoing mooring and biogeochemisty programs at the Bermuda Atlantic Time-Series Site (BATS), and the Hawaii Ocean Time-Series Site (HOTS). As such, the results of this trace metal study can be interpreted within the context of concurrent biogeochemical rate measurements and physical and optical studies, as well in conjunction with time-series atmospheric sampling at Bermuda. It can be expected that the collection of these unique sample sets and their interpretation within the context of ongoing programs will lead to many advances in our understanding of trace metal cycling, bioavailability, the effects of metals on organism growth, and the fate of anthropogenic trace metals in the oceans.