Recruitment Dynamic in Event Driven Bank Circulations

事件驱动的银行流通中的招聘动态

• 批准号: 9016893
• 负责人: Cabell Davis
• 金额: $ 33万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-01-01 至 1993-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9016893&HistoricalAwards=false
• 关键词: Recruitment; Dynamic; Event; Driven; Bank

Dr. Davis and collaborators will develop a series of models of increasing complexity to examine the effects of storms and oceanic eddies on advective loss rates of plankton and fish larvae from an idealized offshore bank. Their working hypothesis is that such "wash-out" events cause major reduction in recruitment in characteristic zooplankton (Calanus, Pseudocalanus, Centropages, Paracalanus) and fish (cod, haddock, herring) populations. Although, for simplicity, they focus on bank circulation, the work will provide insights into basic interactions between physical forcing, food web dynamics, and recruitment which can be applied to other regions of the ocean. The researchers will start with a simple 2-D kinematic model of idealized flow around a bank (Georges Bank parameter values will be used) and will then incorporate simple models of food chain and zooplankton population dynamics. Eulerian models containing simple biology will be compared with Lagrangian ones (using flow trajectories specified from the Eulerian), containing more complete biology. We will develop simplification techniques to reduce biological complexity to a minimal acceptable level given dominant scales of physical and biological forcing. Models of intermediate complexity such as contour dynamics analyses will be developed to assess impact of rings on bank circulation. Finally, they will use a primitive equation (PE) circulation model containing simplified biology and compare the results with the other models. The primitive equation model will be used to obtain realistic dynamical flows given strong topography and stratification, so that temporal-spatial correspondence between physical losses and biological distributions can be determined.

戴维斯博士和他的合作者将开发一系列日益复杂的模型，以检验风暴和海洋涡流对理想近海岸边浮游生物和鱼苗平流损失率的影响。他们的工作假设是，这种“冲刷”事件会导致典型的浮游动物(水蚤、黑线鳕鱼、中央浮游动物)和鱼类(鳕鱼、黑线鳕、鲱鱼)种群数量的大幅减少。尽管为了简单起见，他们专注于岸边循环，但这项工作将提供对物理强迫、食物网动态和招募之间的基本互动的见解，这些互动可以应用于海洋的其他区域。研究人员将从一个简单的理想化河岸周围水流的二维运动学模型开始(将使用乔治斯银行的参数值)，然后将食物链和浮游动物种群动态的简单模型结合起来。包含简单生物学的欧拉模型将与包含更完整生物学的拉格朗日模型(使用欧拉指定的流动轨迹)进行比较。我们将开发简化技术，在给定物理和生物强迫的主要规模的情况下，将生物复杂性降低到最低可接受的水平。将开发中等复杂性的模型，如等高线动力学分析，以评估环对岸边循环的影响。最后，他们将使用包含简化生物学的原始方程(PE)循环模型，并将结果与其他模型进行比较。在给定强地形和层结的情况下，原始方程模型将被用来获得真实的动态流动，从而可以确定物理损失和生物分布之间的时空对应关系。