Interannual Variation in Transuranic Flux at the Vertex Time-Series Station in the Northeast Pacific and Its Relationship to Biological Activity
Interannual Variation in Transuranic Flux at the Vertex Time-Series Station in the Northeast Pacific and Its Relationship to Biological Activity
复制标题
东北太平洋顶点时间序列站超铀通量的年际变化及其与生物活动的关系
DOI：
10.1007/978-94-011-3686-0_31
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
J. Teyssie
中科院分区：
文献类型：
--
作者：
S. Fowler;L. Small;J. Rosa;J.J. López;J. Teyssie
从 1986 年 10 月到 1988 年 5 月，在北太平洋的 VERTEX 时间序列站（北纬 33°，西经 139°）进行了七次航行，间隔大约三个月。在 2000 米水柱上收集未过滤海水、悬浮颗粒物质、沉积物捕集材料、浮游动物及其粪便颗粒中的钚 (239+240Pu) 和（某些情况下）241Am 数据，以检查颗粒相关超铀通量的时间变化及其与上层水层生物活动的关系。注意到 239+240Pu 通量具有一定的季节性，最高通量对应于夏季至初冬低于 400 m 的最低质量通量（可能是由于细颗粒的清除），最低 239+240Pu 通量对应于一年中同一时间高于 150 m 的最高质量通量（显然是由于富光带中的最小清除）。在冬末和春季期间，所有深度的 239+240Pu 通量和质量通量之间的关系几乎没有明显的差异，这表明深度处的清除作用极小，并且通常离开富光带的质量通量较小。以微小颗粒为食的樽海鞘在其粪便颗粒中具有相对较高浓度的 239+240Pu，而更选择性地以较大颗粒为食的桡足类在其粪便中具有较低的超铀浓度。
From October 1986 through May 1988, seven cruises took place at approximately three-month intervals at the VERTEX time-series station (33°N, 139°W) in the North Pacific. Data on plutonium (239+240Pu) and, in some cases,241Am in unfiltered sea water, suspended particulate matter, sediment trap material, and zooplankton and their fecal pellets were collected over a 2000 m water column in order to examine temporal variations in particulate-associated transuranic flux and its relationship to biological activity in the upper water layers. Some seasonality in239+240Pu flux was noted with the highest fluxes corresponding to the lowest mass fluxes below 400 m in summer through early winter (possibly due to scavenging by fine particles), and the lowest239+240Pu fluxes corresponding to the highest mass fluxes above 150 m at the same time of year (due apparently to minimal scavenging in the euphotic zone). Little apparent difference was noted in the relationship between239+240Pu flux and mass flux during late winter and spring at all depths, suggesting minimal scavenging at depth and generally small mass fluxes out of the euphotic zone. Salps which feed on tiny particles have relatively high concentrations of239+240Pu in their fecal pellets while copepods which feed more selectively on larger particles have lower transuranic concentrations in their pellets.