Field Testing of a New IRS Sediment Trap Designed to ExcludeSwimmers

旨在排除游泳者的新型 IRS 沉积物收集器的现场测试

• 批准号: 9015914
• 负责人: John Hedges
• 金额: $ 8.7万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-09-15 至 1992-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9015914&HistoricalAwards=false
• 关键词: Field; Testing; New; IRS; Sediment

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.

这项建议是目前GOFS长期项目的延续，该项目旨在测试毒素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次现场测试，并得出结论，抑制细菌活性的最佳处理也会导致游泳者的通量和有机化学成分的最大伪像。为了排除游泳者，我们设计了一种具有缩进旋转球体和时间序列能力（IRS）的新型陷阱。我们建议在西澳达布湾的秋季开花期间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)新的IRS沉淀物收集器收集的材料的详细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各种大小的游泳者？2) IRS设计是否充分减少了由游泳者产生的化学伪像，从而最终允许在处理过的捕集器中保存不稳定物质和添加浮游动物游泳者之间进行区分？3) IRS陷阱能否配备可靠的次采样旋转盘，用于时间序列收集和现场实验？4) IRS和适应旋转船（IRSC）的捕集器在公海的所有深度都能正常工作吗？5)利用IRS陷阱，我们现在能精确地测量海洋中各种有机分子的垂直通量吗？如果是这样，这些数据可以用来更好地定义粒子动力学和生产力关系吗？我们预期这一新的捕集器将准备用于1991/1992年计划在赤道太平洋进行的地球外大气层试验。