REU: A Trans-Atlantic CTD/Hydrographic Section with AcousticDoppler Current Profiling at 8 Degrees N

REU：跨大西洋 CTD/水文剖面，具有北纬 8 度声学多普勒电流剖面图

• 批准号: 8716314
• 负责人: Dean Roemmich
• 金额: $ 41.73万
• 依托单位: University of California-San Diego
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-12-15 至 1991-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8716314&HistoricalAwards=false
• 关键词: REU; Trans; Atlantic; CTD; Hydrographic

In this project, the investigators will carry out a high-quality hydrographic section along with Acoustic Doppler Current Profiling across the Atlantic Ocean along 8 deg N. This section will complement an intensive deep float deployment to be carried out by other investigators. Geostrophic shear from the CTD data, together with the float trajectories, will be used to extrapolate the velocity field away from the float-derived level of known motion to obtain the top-to-bottom, basin-wide absolute velocity field. Measurements of salinity, oxygen, and nutrient distributions will allow interpretation of the velocity field in terms of source water masses. Acoustic Doppler Current Profiles of the upper few hundred meters, coupled with GPS navigation, will provide additional information on the absolute velocity field, and will also be used to distinguish between geostrophic and ageostrophic (Ekman) shear on large space-scales in the upper ocean. Scientific issues to be addressed by the study include the fluxes of heat and freshwater and the transport and dynamics of deep water masses.

在该项目中，研究人员将沿8°n沿大西洋进行高质量的水文剖面和声学多普勒洋流剖面，该剖面将补充其他研究人员进行的密集深浮子部署。CTD数据中的地转切变将与浮子轨迹一起用于推断已知运动的浮子派生水平的速度场，从而获得从上到下的全盆地绝对速度场。盐度、氧气和营养物分布的测量将使我们能够根据源水质量来解释速度场。在海面上几百米的声波多普勒流剖面，加上GPS导航，将提供绝对速度场的额外信息，也将用于在大空间尺度上区分海洋上层的地转和地转（Ekman）切变。该研究要解决的科学问题包括热通量和淡水通量以及深水团的输送和动力学。