U.S. GLOBEC: Cross-Frontal Distributions and Exchange of Zooplankton on Georges Bank

美国 GLOBEC：乔治滩上浮游动物的跨前沿分布和交换

• 批准号: 9806444
• 负责人: Karen Wishner
• 金额: $ 33.15万
• 依托单位: University of Rhode Island
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-11-01 至 2002-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9806444&HistoricalAwards=false
• 关键词: U.S.; GLOBEC; Cross; Frontal; Distributions

U.S. GLOBEC: Cross-frontal distributions and exchange of zooplankton on Georges Bank Cross-frontal distributions and exchange of zooplankton on Georges Bank are a primary focus of Phase 3 of the U.S. GLOBEC Georges Bank program, which has the broader goal of understanding the response of marine populations to global climate change, especially interactions between zooplankton and fish. This proposal examines the cross-frontal exchange of zooplankton at two sites important to the biology of GLOBEC-targeted species: the Northeast Peak Front in March (coincident with expected inflow of the copepod Calanus finmarchicus and the presence of cod larvae and high predator abundance) and the Southern Flank Tidal Mixing Front in June (coincident with high concentrations of Calanus and predators). Questions addressed include the interaction between vertically-stratified zooplankton distributions and the cross-frontal exchange at different depths, the temporal variability of these interactions on diel, tidal, and fortnightly scales, and the effects over time of the repeated passage of tidal fronts at particular locations along a bathymetric slope. Zooplankton abundances and vertical distributions will be determined from a Lagrangian sampling scheme utilizing transects relative to frontal position conducted at different phases of the tidal cycle (semidiurnal and fortnightly), and will be related to hydrographic structure, tidal phase, and distance from the front. In a complementary Eulerian sampling scheme employing time series sampling at fixed locations along a bathymetric slope, zooplankton distributions and variability will be related to the time since frontal passage. Vertically-stratified MOCNESS tows will be used to collect zooplankton. Cross-frontal exchange of zooplankton (different species and lifestages with different vertical distributions) will be estimated from concentration gradients across the front at different depths and along isopycnal surfaces, using various estimates of flow and water exchange provided by physical oceanographers.

美国GLOBEC：跨锋面分布和交换的浮游动物在乔治银行跨锋面分布和交换的浮游动物在乔治银行是美国GLOBEC乔治银行计划的第三阶段的主要重点，其更广泛的目标是了解海洋种群对全球气候变化的反应，特别是浮游动物和鱼类之间的相互作用。 该提案探讨了跨锋面交换的浮游动物在两个网站的生物学的GLOBEC的目标物种：东北峰前在3月（符合预期流入的桡足类哲水蚤finmarchicus和鳕鱼幼虫和高捕食者丰度的存在）和南侧潮汐混合锋在6月（符合高浓度的哲水蚤和捕食者）。 解决的问题包括垂直分层浮游动物分布和跨锋面交换在不同深度之间的相互作用，这些相互作用的昼夜，潮汐和每两周的尺度上的时间变化，以及随着时间的推移的影响反复通过的潮汐锋在特定位置沿着一个测深斜坡。 浮游动物的丰度和垂直分布将确定从拉格朗日采样计划，利用断面相对于锋的位置进行在不同阶段的潮汐周期（半日和每两周），并将涉及到水文结构，潮汐相位，距离前线。 在一个补充欧拉采样计划，采用时间序列采样在固定位置沿着的测深斜率，浮游动物的分布和变化将与时间，因为锋面通过。 垂直分层的MOCNESS拖将用于收集浮游动物。 将利用物理海洋学家提供的各种流量和水交换估计数，根据不同深度和沿着等密度面的锋面浓度梯度，估计浮游动物（不同物种和生命阶段，垂直分布不同）的锋面交换。