Red Sea Outflow Experiment: Gulf of Aden Data Analysis

红海流出实验：亚丁湾数据分析

• 批准号: 0424647
• 负责人: Amy Bower
• 金额: $ 45万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-10-01 至 2008-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0424647&HistoricalAwards=false
• 关键词: Red; Sea; Outflow; Experiment; Gulf

Intellectual Merit: In 2001, physical oceanographers conducted the Red Sea Outflow Experiment (REDSOX), the first comprehensive field study of the hydrography and circulation of both the descending Red Sea outflow plume and the equilibrated Red Sea Outflow Water (RSOW) in the Gulf of Aden. Two research cruises were carried out during the seasons of maximum (winter) and minimum (summer) outflow transport. Resulting from these cruises, and relevant to the proposed research, are over 200 hydrographic and direct velocity profiles collected between the Strait of Bab el Mandeb and the mouth of the Gulf of Aden on both cruises, and trajectories from 44 acoustically-tracked subsurface RAFOS floats released at the depth of the RSOW salinity maximum. Remote sensing observations were also collected to complement and extend the in situ observations. The major result to date from the gulf study is that large, energetic, deep-reaching mesoscale eddies, and not, as originally hypothesized, boundary undercurrents, dictate the spreading pathways and rates of RSOW through the Gulf of Aden. While these eddies had been detected in satellite altimetry prior to REDSOX, there had been no observations of their subsurface structure. Both cyclones and anticyclones were observed, with diameters of 100-250 km and speeds of 10-30 cm/s at the RSOW level. The overall goal in this study is to go beyond these highlights and conduct an in-depth analysis of the large and multi-dimensional REDSOX data set. This will result in the first description of the physical mechanisms governing the export of RSOW through the Gulf of Aden and into the western Indian Ocean. The final analysis will focus on the following three objectives: 1. To describe the kinematics and dynamics of eddies observed in the Gulf of Aden, their generation mechanisms, and their role in modulating the dispersal and mixing of RSOW 2. To document the hydrographic evolution of RSOW as it transits the Gulf of Aden, due to both isopycnal and diapycnal mixing processes. 3. To determine the Lagrangian statistical properties of the circulation in the Gulf of Aden, and compare with the Mediterranean outflow region. Broader Impact: The proposed analysis is relevant from a global viewpoint in that it addresses the general question of how water masses formed by air-sea exchange in marginal seas are transported into the open ocean. Both PIs make frequent presentations on oceanography for public audiences at, for example, museums and schools, contributing to the scientific literacy of society.

知识价值：2001年，物理海洋学家进行了红海流出实验（REDSOX），这是第一次对亚丁湾红海流出下降羽流和平衡红海流出水（RSOW）的水文和环流进行全面的实地研究。在最大出流量季节（冬季）和最小出流量季节（夏季）进行了两次研究巡航。通过这些巡航，并与拟议的研究相关，在两次巡航中收集了200多个在曼德海峡和亚丁湾河口之间的水文和直接速度剖面，以及在RSOW盐度最大深度释放的44个声学跟踪的水下RAFOS浮标的轨迹。还收集了遥感观测资料，以补充和扩展现场观测资料。迄今为止，海湾研究的主要结果是，大的、高能的、深入的中尺度涡流，而不是最初假设的边界潜流，决定了RSOW通过亚丁湾的传播途径和速率。虽然在REDSOX之前，这些漩涡已经在卫星测高中被探测到，但没有观测到它们的地下结构。观测到气旋和反气旋，直径100-250 km， RSOW水平速度10-30 cm/s。本研究的总体目标是超越这些亮点，对大型多维REDSOX数据集进行深入分析。这将导致第一次描述控制通过亚丁湾和进入西印度洋的RSOW出口的物理机制。最后的分析将集中在以下三个目标：1。描述在亚丁湾观测到的涡旋的运动学和动力学，它们的产生机制，以及它们在调节RSOW 2的扩散和混合中的作用。记录RSOW经过亚丁湾时，由于等流和深流混合过程的水文演化。3. 确定亚丁湾环流的拉格朗日统计性质，并与地中海流出区进行比较。更广泛的影响：从全球的角度来看，拟议的分析是相关的，因为它解决了边缘海域由海气交换形成的水团如何被输送到公海的一般问题。这两个机构经常在博物馆和学校等地向公众介绍海洋学，为提高社会的科学素养作出贡献。