U.S.-GLOBEC: Vertical Distribution of Small Zooplankton During Turbulance Profiling on Georges Bank

目前的证据表明，乔治浅滩地区具有重要商业价值的鱼类幼鱼的招募和存活在很大程度上取决于春夏季分层的发展。预测的气候变化情景可能会显著影响分层的演变，从而影响乔治滩的幼虫生存。作为美国GLOBEC Georges Bank研究的一部分，Beardsley博士和合作者将在1995年1月至8月期间进行一个密集的实地项目，目的是更好地了解Georges Bank上分层的发展及其对幼鱼生存的影响。1994年将开始进行初步研究。该项目将有一个系泊的仪器组件，包括在整个水柱上部署气象传感器和仪器，主要集中在地表和底部边界层。所获得的数据将用于解决分层场和检查控制其发展的因素。船上测量部分将包括五次巡航，跟踪目标物种的浓度（斑块）：鳕鱼和黑线鳕幼虫及其桡足类猎物，Calanus和pseudoalanus。使用各种采样系统，包括漂流器、moness、浮游生物录影记录仪（VPR）、浮游生物泵和多高频声学采样器，测量将包括：(1)水文、微湍流和水流；(2)目标物种的垂直和水平分布与水柱分层的关系；(3)浮游动物个体的被动粒子运动和三维游泳行为；(4)鳕鱼和黑线鳕幼虫的摄食和生长与水柱分层和猎物分布的关系。这些数据将与来自协作现场和建模研究的信息一起使用，以深入了解分层和湍流混合对浮游动物和鱼类种群的生长和生存的影响。

9313671 Beardsley Present evidence indicates that the recruitment and survival of commercially important fish larvae within the Georges Bank region depends critically on the development of stratification during the spring and summer period. Predicted climate change scenarios are likely to significantly influence the evolution of stratification and thus impact larval survival over Georges Bank. As part of U.S. GLOBEC Georges Bank Study, Dr. Beardsley and collaborators will conduct an intensive field project during January-August, 1995 aimed at better understanding the development of stratification over Georges Bank and its influence of larval fish survival. Preliminary studies will be initiated in 1994. The project will have a moored instrument component will involve deploying meteorological sensors and instruments throughout the water column, with a heavy concentration in the surface and bottom boundary layers. The data acquired will be used to resolve the stratification field and examine factors controlling its development. The shipboard measurement component will consist of five cruises following a concentration (patch) of the target species: cod and haddock larvae and their copepod prey, Calanus and Pseudocalanus. Using a variety of sampling systems,including drifters, MOCNESS, the Video Plankton Recorder (VPR), plankton pump, and multiple- high-frequency acoustical samplers, measurements will be made of: (1) hydrography, microturbulence, and currents, (2) the vertical and horizontal distributions of the target species in relation to water column stratification, (3) passive particle motions and the tree-dimensional swimming behaviors of individual zooplankton, and (4) the feeding and growth of larval cod and haddock in relation to water column stratification and prey distribution. The data will be used together with information from collaborative field and modeling studies to gain insights into the impact of stratification and turbulent mixing on gro wth and survival of zooplankton and fish populations.