Field Testing of a New IRS Sediment Trap Designed to ExcludeSwimmers

这项建议是目前GOFS一个长时间项目的延续，该项目旨在测试毒药和防腐剂在防止沉积物捕集器中收集的有机物分解方面的有效性。我们已经完成了这个问题的三个现场测试，得出的结论是，抑制细菌活性的最佳处理方法也会导致游泳者在通量和有机化学成分方面产生最大的人工制品。为了排除游泳者，我们设计了一种具有凹陷旋转球体和时间序列能力(IRS)的新型陷阱。我们建议在秋季水花盛开期间在华盛顿州的达博湾和夏威夷时间序列站测试这种新的捕集器设计。正在解决的问题是：1)对在新的IRS沉积物捕集器中收集的材料进行详细的化学分析是否表明，这种设计比传统的开放式收集器更有效地排除了所有大小的游泳者？2)IRS的设计是否充分减少了游泳者产生的化学假象，最终允许区分不稳定物质在处理后的保存诱捕器和增加浮游动物游泳者？3)IRS捕捉器是否可以安装可靠的亚采样旋转木马，用于时间序列采集和现场实验？4)IRS和旋转木马适应(IRSC)捕捉器在公海的所有深度都能适当地执行吗？5)使用IRS捕捉器，我们现在能准确地测量海洋中各种有机分子的垂直通量吗？如果是这样的话，这些数据能否被用来更好地定义粒子动力学和生产率关系？我们预计这一新的捕捉器将在1991/1992年计划的赤道太平洋GOFS实验中使用。

This proposal is a continuation of a present GOFS long-lead time project to test the effectiveness of poisons and preservatives on preventing the decomposition of organic matter collected in sediment traps. We have completed three field tests of this question and concluded that the best treatments for inhibiting bacterial activity also resulted in the greatest artifact in both flux and organic chemical composition from swimmers. In order to exclude swimmers, we have designed a novel trap with an indented rotating sphere and time-series capability (IRS). We propose to test this new trap design in Dabob Bay, WA, during fall bloom, and at the Hawaii time-series station. The questions being addressed are: 1) Do detailed chemical analyses of materials collected in the new IRS sediment trap indicate that this design excludes swimmers of all sizes more effectively than conventional open collectors? 2) Are the chemical artifacts resulting from swimmers reduced sufficiently by the IRS design to finally allow discrimination between preservation of labile substances in treated traps and the addition of zooplankton swimmers? 3) Can the IRS traps be fitted with dependable subsampling carousels for time-series collections and in-situ experiments? 4) Do the IRS and carousels-adapted (IRSC) traps perform suitably at all depths in the open ocean? 5) Using IRS traps, can we now measure accurately the vertical fluxes of a wide range of organic molecules throughout the ocean? If so, can these data be used to better define particle dynamics and productivity relationships? We anticipate that this new trap will be ready for use in the planned equatorial Pacific GOFS experiment in 1991/1992.