Collaborative Research: A Lagrangian SeaSoar Study of the Coupling of Circulation, Mixing, and Productivity at a Shelfbreak Front

0002390 Houghton将在中大西洋湾进行一系列实地实验，调查在陆架断裂前缘附近观察到的生物活动增强的巧合的原因。要检验的假设是物理的和生物的。首先，底边界层浮力通量的汇聚驱动富营养陆架水沿陆架坡折前缘的向岸侧沿着上涌。第二，由于这种大通量的营养物质和最佳的光学条件的水从浑浊的陆架水透明的海洋水过渡，使前面的一个区域具有高光合效率的生物活性增强。五项新技术（染料示踪剂、等密度浮标、带高速化学分析的泵送Seasoar、拖曳式显微结构仪器和利用光学变化估计浮游植物的光合特性）将用于三次为期10天的巡航，在拉格朗日框架内跟踪锋面。

0002390 HoughtonThe cause for the observed coincidence of enhanced biological activity in the vicinity of shelfbreak fronts will be investigated by a series of field experiments in the Middle Atlantic Bight. The hypotheses to be tested are both physical and biological. First the convergence of buoyancy flux in the bottom boundary layer drives upwelling of nutrient rich Shelf Water along the shoreward side of the shelfbreak front. Second, the biological activity is enhanced due to this large flux nutrient and by optimal optical conditions as the water transitions from turbid shelf water to clear oceanic water, making the front a region with high photosynthetic efficiency. Five new technologies (dye tracer, isopycnal floats, pumped Seasoar with high speed chemical analysis, towed microstructure instrument and use of optical variability to estimate photosynthetic properties of phytoplankton) will used in three 10-dy cruises to track the front in a Lagrangian framework.