Trace Element Scavenging and Variable Particle Flux: A Time-Series Investigation

在为期两年的东北太平洋时间序列研究期间，将通过测量溶解、悬浮和下沉颗粒元素分布的时间变化，研究微量元素清除机制和颗粒动力学。最近开发的原位泵将用于收集整个水柱中悬浮物的无污染大小分馏样品。在加利福尼亚海流的一个深水站的五个职业将取样三个季节不同的生产力。该采样将与同时进行的沉积物捕集器和溶解元素测量相结合，以检查生产力变化和垂直质量通量对生产力东部边界水柱中微量元素总体分布的影响。所有三个池的样品将分析Al， Fe, Ca, Si, Mn, Pb, Zn, Cu, Ni, Cd, Ba， I， U和232Th。这项研究将解决缺乏关于颗粒微量元素分布的基本信息的问题，这些信息目前限制了现实清除模型的制定。元素行为的化学差异将被用作清除过程的探针，正如我们之前在百慕大、东北大西洋和东北太平洋样品中测量的这些元素的子集所说明的那样。此外，颗粒物质的元素组成将被用作颗粒池之间质量交换的示踪剂。

Study will be made of trace element scavenging mechanisms and particle dynamics through measurements of temporal variations in dissolved, suspended particulate and sinking particulate elemental distributions during a two year time-series study in the northeast Pacific. A recently-developed in situ pump will be used for collection of contamination-free size-fractionated samples of suspended matter throughout the water column. Five occupations of a deep-water station in the California Current will sample three seasons of varying productivity. This sampling will be coupled with simultaneous sediment trap and dissolved element measurements to examine the effect of changing productivity and vertical mass flux on the overall distribution of trace elements in a productive eastern boundary water column. Samples of all three pools will be analyzed for Al, Fe, Ca, Si, Mn, Pb, Zn, Cu, Ni, Cd, Ba, I, U, and 232Th. This research will address the shortage of fundamental information on the distribution of particulate trace elements which currently limits formulation of realistic scavenging models. The chemical differences in the behavior of elements will be used as probes of the scavenging process, as illustrated by our previous measurements of a subset of these elements in samples from Bermuda, the Northeast Atlantic, and the Northeast Pacific. In addition, elemental composition of particulate matter will be used as a tracer of mass exchange among particulate pools.