US GLOBEC: Investigation of Wate-Mass Exchange Across the Tidal Mixing Front over Southern Georges Bank and Its Impact on Larval Fish and Zooplankton Populations

美国GLOBEC：乔治斯海岸南部潮汐混合锋的水团交换及其对鱼类和浮游动物幼体种群的影响该项目将侧重于乔治斯海岸潮汐混合锋面的水团交换和混合，以及这些过程对鱼类和浮游动物幼体种群的影响。作为该项目的一部分，将于1999年5-6月在东北峰和南侧的潮汐混合锋区进行一系列实地研究。这些研究将包括染料和漂流跟踪以及ADCP、CTD和浮游生物录像机(VPR)调查。此外，研究人员将使用诊断模型来探索近正面运动和混合率的差异如何影响幼虫和浮游动物的运动。现场资料将被分析以(1)解决潮汐混合锋区的三维环流和浮游动物种群场，(2)确定汇聚到锋面的区域，(3)量化水和浮游动物的汇聚和跨锋面交换的速率，(4)量化锋区的双日和等日混合率，以及(5)检查浮游动物的游泳行为与不同的层结、流动和垂直混合率的关系。

U.S. GLOBEC: Water-Mass Exchange across the Tidal Mixing Front over Southern Georges Bank and Its Impact on Larval Fish and Zooplankton PopulationsThis project will focus on water mass exchange and mixing across the tidal mixing front over Georges Bank and the impact these processes have on larval fish and zooplankton populations. As part of the project, a series of field studies will be carried out in the region of the tidal mixing front over the northeast peak and southern flank during May-June 1999. These studies will include dye and drifter tracking as well as ADCP, CTD, and video plankton recorder (VPR) surveys. In addition, the investigators will use a diagnostic model to explore how differences in near-frontal motions and mixing rates influence larval and zooplankton movement. The field data will be analyzed to (1) resolve the 3-dimensional circulation and zooplankton population field in the region of the tidal mixing front, (2) to identify regions of convergence onto the front, (3) to quantify rates of convergence and cross-frontal exchange of both water and zooplankton, (4) to quantify diapycnal and isopycnal mixing rates in the frontal region, and (5) to examine zooplankton swimming behavior in relation to various conditions of stratification, flow, and vertical mixing rate.