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

陆架水性质和动态的年际变化的事件规模

• 批准号: 0527168
• 负责人: John Barth
• 金额: $ 98.34万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-09-15 至 2009-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0527168&HistoricalAwards=false
• 关键词: Event; Scale; Interannual; Variations; Shelf

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.

提出了一项基于滑翔机的大陆架斜坡动力学观测研究，旨在检查风强迫和测深（简单和复杂几何）在广泛时间尺度上的相对作用。最初，滑翔机将被用来占据一个相对简单的测深区域的一个跨大陆架部分（赫塔滩以北，沿着一条常规占用的水文线）。这项工作将涉及两台韦伯研究公司的200米滑翔机（已经由pi拥有）连续运行，以提供连续的时间序列。在第二年，PIs要求支持第三台能够飞行1000米的滑翔机加入到旋转中，这将包括第二条线，位于Heceta Bank以南，用于测量复杂的水深测量中风力驱动的响应。滑翔机大约需要5天的时间来穿越每个区域，每20天的任务需要4次穿越。为期三年的部分记录将与遥感数据、系泊时间序列和数值模拟相结合，以检查天气带到水团性质、分层和沿大陆架运输的年际变化，评估风强迫和水深测量如何控制海岸喷流分离，并测试二维上升流和下升流锋面模型。该研究使用一种允许全年采样的技术解决了沿海动力学中的一系列重要问题。以5天的间隔重复三年的部分，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剖面作业将提供一个特殊的数据集，用于研究可变的风和浮力强迫如何与不同的底层水深相互作用，从而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统计结果的可信度超过通常可用的水平。