EAGER: Exploration of the Ocean Surface for the Source of Arecibo's Continuous Thermospheric Gravity Waves

EAGER：海洋表面探索阿雷西博连续热层重力波的来源

• 批准号: 0946636
• 负责人: Frank Djuth
• 金额: $ 4.83万
• 依托单位: Geospace Research Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-08-15 至 2010-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0946636&HistoricalAwards=false
• 关键词: EAGER; Exploration; Ocean; Surface; Source

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).The investigator will utilize satellite altimetry data to identify the specific ocean source responsible for thermospheric Acoustic Gravity Wave observations made at the Arecibo observatory. The Arecibo Observatory is the largest atmospheric radar in the world and the research will make full use of its high atmospheric resolving capabilities. The investigator and colleagues have previously discovered that a continuum of waves is present in the upper atmosphere above Arecibo Observatory (AO), Puerto Rico. It has been determined that these fluctuations are the result of the propagation of neutral atmospheric waves through the ionized portion of the upper atmosphere from 120 km altitude to heights greater than 650 km. The research effort will investigate whether the thermospheric wave production process is unique to the ocean near Arecibo (e.g., related to the Puerto Rican Trench), or whether it can be found at other global locations. A better understanding of these processes will greatly improve our understanding of gravity wave propagation. Attention will be focused on identifying ocean structures capable of producing a broad spectrum of horizontal AGW wavelengths and periods in the range of 5-90 min. Satellite altimetry measurements from repeat orbits will be used to search for far infragravity ocean waves and determine surface wavelength and direction of wave motion. In addition other ocean features created by the presence of the Antilles current will be examined as well as the nature of the mesoscale eddies. In addition, signs of Ekman upwelling, seiches, edge waves, or Kelvin waves will be investigated in detail to determine their impact on Acoustic Gravity Wave propagation and thermospheric signatures observed by Arecibo.The investigator is involving young undergraduates students, who will participate in the data analysis as well as receive a valuable learning experience.

该奖项是根据2009年的《美国回收与再投资法》资助的（公共法111-5）。研究人员将利用卫星高度计数据来确定负责在Arecibo Perservatory进行热层声学重力波观测的特定海洋来源。 Arecibo天文台是世界上最大的大气雷达，该研究将充分利用其高大气分辨能力。研究者和同事先前已经发现，波多黎各的Arecibo天文台（AO）上方的高层大气中存在一系列波浪。已经确定，这些波动是中性大气波通过高度的离子化部分传播的结果，从120 km的高度到高于650 km的高度。 研究工作将调查热圈波生产过程是Arecibo附近的海洋所独有的（例如，与波多黎各沟渠有关），还是在其他全球位置可以找到它。更好地了解这些过程将大大提高我们对重力波传播的理解。 注意将集中在识别能够产生水平AGW波长和周期范围内的海洋结构上。重复轨道的卫星高度测量测量将用于搜索远距离的海洋波，并确定表面波长和波动运动的方向。此外，还将检查由Antilles电流存在的其他海洋特征以及中尺度涡流的性质。此外，将详细研究Ekman上升流，seiches，边缘波或开尔文波的迹象，以确定它们对arecibo观察到的声学重力波传播和热层特征的影响。研究人员正在涉及年轻的本科生，他们将参与数据分析以及获得有价值的学习经验。