Collaborative Research: Dye Tracer and Modeling Investigations of Cross-Shelf Circulation during Coastal Upwelling

现场和模拟研究将用于确定上升水的来源，即仅来自底部边界层（BBL）或来自较厚的下层流体区域，以及被取代的地表水的去向，例如，在近海的表层或通过俯冲作用进入中间层。五个染料研究，使用荧光素和罗丹明- wt，提出了上升流地区在俄勒冈大陆架。释放将发生在三个不同的位置：上升流射流的下方和近岸，射流下方的BBL，预计会发生陆上运动，以及射流的近岸，就在混合层下方，但仍在Ekman层中，预计会发生海上运动和可能的俯冲。我们会追踪戴伊72小时。背景环境将由GLOBEC巡游确定，至少在第一个实地年。第一年将追踪Elakha号的三次释放。第二年将涉及R/V Wecoma的两个更大的版本。为该地区配置的普林斯顿海洋模型的一个版本将运行以进行比较。粒子追踪技术将用于模拟初始的小尺度色散。将尝试理想化的情况和现实的建模。一个2-D的海洋模型将与浮标GPS漂移器一起使用，在释放后跟踪水下染料斑块。研究结果将是上升流期间跨大陆架运输路径的一组拉格朗日观测。这将有助于提高对循环和混合的理解。

Dale0136900Field and simulation studies will be used to determine where upwelled water originates, i.e. solely from the bottom boundary layer (BBL) or from a thicker region of the lower layer fluid, and where the displaced surface water goes, e.g. offshore in the the surface layer or, through subduction, to intermediate layers. Five dye studies, using fluorescene and rhodamine-WT, are proposed for the upwelling region over the Oregon shelf. Releases will occur in three different locations - beneath and inshore of the upwelling jet, in the BBL beneath the jet where onshore movement is expected, and inshore of the jet, just beneath the mixed layer but still in the Ekman layer, where offshore movement and possible subduction is expected. Dye will be tracked for 72 hours. The background environment will be defined by GLOBEC cruises, at least during the first field year. Three releases from the R/V Elakha will be traced during the first year. The second year will involve two larger releases from the R/V Wecoma. A version of the Princeton Ocean Model, configured for the region, will be run for comparison. Particle tracing techniques will be used to model the initial, small-scale dispersion. Both idealized situations and realistic modeling will be attempted. A 2-D ocean-going model will be used, in conjunction with buoyed GPS drifters, to track the subsurface dye patch after release. The results of the study will be a set of Lagrangian observations of cross-shelf transport pathways during upwelling. These will lead to improved understanding of circulation and mixing.