GLOBEC: Significance of Circulation to Egg and Larval Distributions on Georges Bank

这是一项跨学科、特定地点的建模研究，重点是在美国全球变化研究计划的GLOBEC-全球海洋生态系统动态框架内进行的乔治浅滩。它涉及美国和加拿大渔业和海洋部科学家的合作努力。生物和物理数据将在达特茅斯学院和斯基德韦海洋研究所正在开发的三维环流模型的帮助下进行检查。这项研究将集中在海扇贝(Placopectin Magellanicus)、大西洋鳕鱼(Gadus Morhua)和桡足类动物Calanus finmarchicus。将建立由环流模型驱动的幼虫漂移模型，并用于确定月平均环流场可在多大程度上解释乔治斯滩上的卵和幼虫分布，并评估简单行为(垂直迁移)和较复杂的物理(时间依赖性、空间结构)对卵和幼虫分布的意义。一般方法将侧重于零假设，即分布是由月平均环流场中的被动平流和扩散决定的，而推论是表观“滞留”仅仅是世行自然停留时间的反映。还将探讨高频流动变率、小尺度流动结构和垂直迁移对重大影响的假设。

This is an interdisciplinary, site-specific modeling study focused on the Georges Bank conducted within the GLOBEC - Global Ocean Ecocsystems Dyanamics framework of the U.S. Global Change Research Program. It involves a collaborative effort on the part of U.S. and Canadian scientists at the Department of Fisheries and Oceans. Biological and physical data will be examined with the aid of three-dimensional circulation models under development at Dartmouth College and Skidaway Institute of Oceanography. The study will focus on sea scallops (Placopectin magellanicus), Atlantic cod (Gadus morhua) and the copepod Calanus finmarchicus. Larval drift models driven by the circulation models will be created and used to determine the extent to which egg and larval distributions on Georges Bank can be explained by the monthly-mean circulation fields; and to evaluate the significance of simple behaviors (vertical migration) and more complex physics (time-dependence, spatial structures) to the egg and larval distributions. The general approach will be to focus on the null hypothesis that distributions are determined by passive advection and diffusion in the monthly-mean circulation fields, and the corollary that apparent "retention" is merely a reflection of the Bank's natural residence time. Hypotheses for significant influences from higher-frequency flow variability, small-scale flow structures and vertical migration will also be explored.