U.S. GLOBEC: GEORGES BANK PHASE III Cross-Frontal Exchange Studies at the Base of the Tidally Mixed Front using an Injected Dye Tracer

美国 GLOBEC：乔治银行第三阶段使用注入染料示踪剂在潮汐混合锋面基础上进行的跨锋面交换研究

• 批准号: 9806361
• 负责人: Robert Houghton
• 金额: $ 32.87万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-11-15 至 2002-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9806361&HistoricalAwards=false
• 关键词: U.S.; GLOBEC; GEORGES; BANK; PHASE

U.S. GLOBEC: GEORGES BANK PHASE III Cross-frontal exchange studies at the base of the tidally mixed front using an injected dye tracerRobert W. Houghton Georges Bank is surrounded by a tidally mixed front. The role of this front in maintaining the high biological productivity on the Bank (Is it a barrier or conduit?) is not fully understood. There is evidence that cross-frontal circulation may be critical for modulating the flux of nutrients and the retention of particles, such as zooplankton and fish larvae, on the Bank both of which contributes to the high productivity of this ecosystem. We propose to use a purposefully injected dye to directly measure the mixing and cross-bank circulation at the foot of the tidal front where on-bank flux is expected to be greatest. The utility of a fluorescent dye tracer for such studies has recently been demonstrated at the shelfbreak front on the New England Shelf. The ability of the dye to follow a constantly moving frontal boundary makes it a particularly powerful technique for studies on Georges Bank. Since the spreading of the dye patch is referenced to the temperature field that defines the front, the complexity introduced by frontal displacements, irregular bottom topography, and a fluctuating, strong along-bank flow is avoided and the cross-frontal circulation and mixing is unambiguously defined. The dye tracer measurements will contribute directly to our understanding of the processes that make Georges Bank such a highly productive marine ecosystem. This understanding is necessary in order to manage this resource to maintain and exploit its optimum contribution to the nation's economy. The understanding is also necessary to anticipate how changes in the forcing of this ecosystem by potential climate changes will affect this, and other, valuable marine resources. This project by demonstrating the unique utility of the dye tracer will advance the development of this technology for future applications in marine research.

美国Globec：Georges Bank III阶段在潮汐混合前线的跨额外交换研究使用注射的染料Tracerrobert W. Houghton Georges Bank被潮汐混合的前部包围。 该方面在保持银行的高生物生产力方面的作用（这是障碍还是导管？）。 有证据表明，跨额外的循环可能对于调节营养的通量和颗粒的保留，例如浮游动物和鱼幼虫，这两者都会有助于该生态系统的高生产率。 我们建议使用有目的的注射染料直接测量潮汐前通量最大的潮汐前脚下的混合和跨银行循环。 最近，在新英格兰架子上的Shelfbreak Front证明了荧光染料示踪剂的效用。 染料遵循不断移动的正面边界的能力使其成为乔治银行研究的特别强大技术。 由于染料斑块的扩散是指定义正面的温度场，因此额叶位移，不规则的底部地形以及波动的复杂性避免了强烈的沿岸流动，并且跨额外的循环和混合被明确定义。 染料示踪剂的测量将直接有助于我们对使Georges Bank成为如此高生产力的海洋生态系统的过程的理解。 为了管理该资源以维持和利用其对国家经济的最佳贡献，这是必要的理解。 还需要理解来预测潜在气候变化对本生态系统强迫的变化将影响这一和其他有价值的海洋资源。 通过证明染料示踪剂的独特效用，该项目将推动该技术在海洋研究中的未来应用。