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On the physics, circulation and exchange processes of the Rio de la Plata Estuary and the adjacent shelf.

机译：关于里约热内卢河口及邻近大陆架的物理，循环和交换过程。

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摘要

The Rio de la Plata Estuary and the adjacent shelf located at 35°S on the eastern coast of South America constitute one of the major Regions Of Freshwater Influence (ROFI) in the world. Remote sensing information, historical hydrographic data, long-term records of forcings from coastal stations, and high-resolution velocity and density data collected during two research cruises from the RIOPLA project are combined to examine the physical characteristics and exchange processes of this large-scale estuarine-shelf system.; The study is divided in three parts: the analysis of the forcing mechanisms, the study of the transition zone, and the investigation of the fate of the buoyant plume and development of coastal upwelling.; The dynamical boundaries of the system were delimited based on remote sensing information, analyzing the variability of the frontal zones. The estuarine turbidity front was established as the dynamical boundary between the freshwater outflow and the brackish water, constituing the transition between the inner and outer estuary. The large spatio-temporal variability across the estuary is associated with distinct dynamics controlling the northern, central and southern parts. The importance of intratidal processes contributes to the enhanced estuarine characteristics of the central and southern area, while long time-scale variability associated with buoyancy, wind and ambient flow contributes to shelf-like dynamics along the northern coast. Strong seasonality characterizes the buoyant plume as the result of complex interaction of buoyancy, winds and ambient flow. The plume is surface-advected, and the shelf is strongly stratified. The roles of a newly discovered topographically steered jet, the Pozo de Fango Current, as well as an important coastal upwelling region are discussed.
机译：里约热内卢河口和南美洲东部沿海35°S附近的陆架是世界上主要的淡水影响区（ROFI）之一。结合了遥感信息，历史水文数据，沿海站强迫的长期记录以及在两次RIOPLA项目研究航行中收集的高分辨率速度和密度数据，以检查这种大规模的物理特征和交换过程河口架系统。该研究分为三个部分：对强迫机制的分析，过渡带的研究以及浮羽的命运和沿海上升流的发展的调查。系统的动态边界是根据遥感信息划定的，分析了额叶地带的变化性。河口浊度前沿被确定为淡水流出与微咸水之间的动力学边界，构成了内河口与外河口之间的过渡。整个河口的时空变化很大，与控制北部，中部和南部地区的独特动力有关。潮间过程的重要性有助于增强中部和南部地区的河口特征，而与浮力，风和环境流量相关的长时间尺度变化则有助于沿北海岸的架子状动力。由于浮力，风和环境流量之间复杂的相互作用，强烈的季节性特征便是浮羽的特征。羽流平流，架子强烈分层。讨论了新发现的地形导向射流Pozo de Fango Current的作用以及重要的沿海上升流地区。

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  • 作者

    Framinan, Mariana.;

  • 作者单位

    University of Miami.;

  • 授予单位 University of Miami.;
  • 学科 Physical Oceanography.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 487 p.
  • 总页数 487
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 海洋物理学;
  • 关键词

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