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

0002390霍顿将在大西洋中部海域进行一系列野外实验，以调查在冰架断裂锋附近观察到的生物活动增强的巧合的原因。需要测试的假设包括物理和生物两方面。首先，底边界层浮力通量的辐合驱动富营养盐陆架水沿陆架断裂锋的滨侧上涌。其次，由于这种大通量的营养物质和从浑浊的陆架水过渡到清澈的海水的最佳光学条件，生物活性得到增强，使锋面成为一个光合效率高的区域。五项新技术（染料示踪剂、等旋浮子、带高速化学分析的泵送Seasoar、拖曳微结构仪器和利用光学变异性来估计浮游植物的光合特性）将在拉格朗日框架下进行三次为期10天的巡航，以跟踪锋面。

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.