Event-Scale to Interannual Variations in Shelf Water Properties and Dynamics

提出了一项基于滑翔机的陆架斜坡动力学观测研究，旨在研究风力和水深测量(简单和复杂的几何形状)在广泛的时间范围内的相对作用。最初，滑翔机将被用来占据相对简单的水深测量区域(赫切塔浅滩以北，沿着一条经常占用的水文线)的单一跨陆架区段。这项工作将包括两架韦伯研究公司(Webb Research Corporation)200米滑翔机(已经由PI拥有)串联运行，以提供连续的时间序列。在第二年，PI请求支持第三架1000米能力的滑翔机加入旋转，然后将包括第二条线，赫切塔浅滩以南，测量复杂水深测量的风致响应。滑翔机需要大约5天的时间来穿越每一段，每次20天的任务产生4次穿越。三年的断面记录将与遥感数据、系泊时间序列和数值模拟相结合，以检查水团性质、层化和沿陆架输送的天气波段到年际变化，评估风力和水深测量如何控制沿海急流分离，并测试二维上升流和下流锋模型。这项研究使用了一种可以全年采样的技术，解决了海岸动力学中的一系列重要问题。每隔5天重复三年的部分，采样将捕获目标过程的多个实现。在一系列强迫条件下频繁的断面占据将提供一个特殊的数据集，用于研究变化的风和浮力强迫如何与不同的下伏水深相互作用，以控制沿海急流的演变。长时间序列和天气波段时间分辨率的结合将使结果具有超出通常可用结果的统计置信度。

A glider-based observational study of shelf-slope dynamics designed to examine the relative roles of wind-forcing and bathymetry (simple and complex geometries) over a broad range of timescales is proposed. Initially, gliders will be employed to occupy a single cross-shelf section in a region of relatively simple bathymetry (north of Heceta Bank, along a regularly-occupied hydrographic line). This effort will involve two Webb Research Corporation 200-m gliders (already owned by the PIs) operating serially to provide continuous time series. During the second year, the PIs request support for a third, 1000-m capable glider to be added to the rotation which will then include a second line, south of Heceta Bank, to measure wind-driven response over complex bathymetry. Gliders require roughly 5 days to traverse each section, yielding four crossings per 20-day mission. The three-year record of sections will be combined with remote sensing data, moored time series and numerical simulations to examine weather-band to interannual variability in water mass properties, stratification and along-shelf transport, evaluate how wind-forcing and bathymetry govern coastal jet separation and to test two-dimensional upwelling and downwelling front models. The study addresses a suite of important issues in coastal dynamics using a technology that permits year-round sampling. With three years of sections repeated at 5-day intervals, sampling will capture multiple realizations of target processes. Frequent section occupations under a range of forcing conditions will provide an exceptional data set for examining how variable wind and buoyancy forcing interact with differing underlying bathymetry to govern evolution of the coastal jet. The combination of long time series and weather-band temporal resolution will lend a statistical confidence to the results beyond that normally available.