Collaborative Research: Profiling Alace Floats for the Sub-Polar Gyre in Support of the Atlantic Circulation and Climate Experiment (ACCE)

合作研究：分析 Alace 浮标的次极环流以支持大西洋环流和气候实验 (ACCE)

• 批准号: 9531879
• 负责人: W. Brechner Owens
• 金额: $ 148.12万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-07-01 至 2002-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9531879&HistoricalAwards=false
• 关键词: Collaborative; Research; Profiling; Alace; Floats

9531879 Owens In conjunction with a companion project by Dr. Russ Davis of the Scripps Institution of Oceanography, 150 profiling ALACE (Autonomous Lagrangian And Circulation Explorer) floats will measure the absolute velocity and evolution of the temperature and salinity structure of the upper 1500 m in the subpolar gyre as part of the Atlantic Circulation and Climate Experiment (ACCE). Absolute velocities will be mapped at nominal depths of 400 and 1500 meters' depth using float arrays deployed uniformly over the basin. The velocity data will address three major pathways of the meridional overturning circulation (MOC) within the subpolar gyre: the shallow inflow of water into the regions of water mass modification; the convection that forms new dense waters; and the outflow of the resultant intermediate water from this source region. Temperature and salinity profiling will describe time evolution of the upper 1500 m, allowing quantification of the rates of water-mass modification in the warm-water limb of the MOC that supplies water for formation of deep and intermediate water. With 150 profiles observed roughly every ten days over two years, these observations will describe evolution with a combined temporal and spatial resolution greater than can be provided by all the other ACCE observations, especially over the winter-time convection season when other observations are extremely scarce. Analysis of these data will provide time series of three- dimensional maps of the velocity, temperature, and salinity fields within the upper 1500 m of the subpolar gyre over the duration of the ACCE field experiment. Additionally, statistical analyses will provide spatial distributions of mean circulation and quantities like eddy kinetic and potential energies, eddy mixing, and fluxes of heat and freshwater. These gyre-wide estimates will provide strong constraints for the future climate models that must be developed to adequa tely include the physics of the subpolar gyre, particularly convection. The absolute velocity measurements will also be used to reference large-scale geostrophic shears obtained from hydrography in this region where strong barotropic components are common.

9531879 欧文斯 在与一个同伴项目由博士拉斯戴维斯的 斯克里普斯海洋学研究所，150 ALACE剖面 （自治拉格朗日和环流探测器）浮动将 测量绝对速度和温度的变化 1500米以上的亚极地环流和盐度结构 作为大西洋环流和气候实验的一部分 （ACCE）。 将在标称深度绘制绝对速度图， 400米和1500米的深度，使用均匀部署的浮子阵列 在盆地上。 速度数据将解决三个主要问题 内纬向翻转环流（MOC）的路径 副极地环流：水流入该地区的浅水 水团的改变;形成新的密集的对流 沃茨;以及由此产生的中间水从 这个来源地。 温度和盐度剖面将 描述1500米以上的时间演变， 水的质量修改率的量化 MOC的温水分支，为形成提供水 深水和中层水。 粗略观察了150个剖面 两年中每隔十天，这些观测将描述 以更高的时间和空间分辨率 比所有其他ACCE观测所能提供的还要多， 特别是在冬季对流季节， 观察是非常罕见的。 对这些数据的分析将提供三个时间序列- 速度、温度和盐度的三维图 场在上1500米的副极地环流在 ACCE现场实验的持续时间。 此外，统计 分析将提供平均环流的空间分布 以及像涡动动能和势能， 混合，以及热量和淡水的流动。这些环流范围 估计将提供强有力的 必须开发的未来气候模型的限制 充分地 包括副极地环流的物理学， 对流 还将使用绝对速度测量值 参考大尺度地转切变， 该区域水文地理学 正压分量是常见的。