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

研究微量元素清除机制， 粒子动力学通过测量时间的变化， 溶解、悬浮和沉降颗粒物元素 在东北部两年时间序列研究期间的分布 太平洋是如此 将使用最近开发的原位泵， 收集无污染的粒度分级样品， 水体中的悬浮物 五种职业 加州洋流的一个深水站将采集三个 不同生产力的季节。 本次采样将与 同时进行沉积物收集和溶解元素测量 研究生产力和垂直质量变化的影响， 通量对微量元素总体分布的影响 东部边界水柱。 所有三个样本池的样本将 分析Al、Fe、Ca、Si、Mn、Pb、Zn、Cu、Ni、Cd、Ba、I、U， 232街 这项研究将解决基础设施短缺的问题。 关于微粒微量元素分布的信息， 目前限制了现实的清除模型的制定。 的 元素行为的化学差异将被用作 清除过程的探测，正如我们以前的 测量了百慕大样本中这些元素的子集， 东北大西洋和东北太平洋。 此外，本发明还提供了一种方法， 颗粒物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.