SGER: An Intercomparison of Lowered Acoustic Doppler CurrentProfilers and Expendable Current Profilers

SGER：降低声学多普勒电流剖面仪和一次性电流剖面仪的比较

• 批准号: 9727701
• 负责人: Kurt Polzin
• 金额: $ 4.35万
• 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: 1997
• 资助国家: 美国
• 起止时间: 1997-10-01 至 1999-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9727701&HistoricalAwards=false
• 关键词: SGER; Intercomparison; Lowered; Acoustic; Doppler

Intercomparison measurements between Lowered Acoustic Doppler Current Profiler (LADCP) and Expendable Current Profiler (XCP) velocity profiles will be conducted to better define the response function and noise characteristics of the LADCP. Both noise and beam spreading are likely sources of uncertainty for studies of the finescale internal wave field (vertical wavelengths smaller than 200 m). Beam spreading effects arise from horizontal non-uniformity in the oceanic flow field and have the greatest impact at low buoyancy frequencies: Lower buoyancy frequencies imply smaller horizontal wavelengths (greater horizontal non-uniformity) for a given vertical wavelength. Therefore, the comparison measurements will be done in a region where stratification is relatively weak on a World Ocean Circulation Experiment (WOCE) cruise running south of Greenland in the North Atlantic. Spectral models will be developed to further understand these errors, delineate limitations of the instrumentation and optimize processing algorithms for finescale parameterization studies.

将进行降低声学多普勒电流剖面仪 (LADCP) 和消耗式电流剖面仪 (XCP) 速度剖面之间的比较测量，以更好地定义 LADCP 的响应函数和噪声特性。噪声和光束扩展都可能是细尺度内波场（垂直波长小于 200 m）研究的不确定性来源。波束扩散效应由海洋流场中的水平不均匀性引起，并且在低浮力频率下影响最大：对于给定的垂直波长，较低的浮力频率意味着更小的水平波长（更大的水平不均匀性）。因此，比较测量将在北大西洋格陵兰岛以南的世界海洋环流实验（WOCE）巡航中分层相对较弱的区域进行。将开发光谱模型以进一步了解这些误差，描绘仪器的局限性并优化精细参数化研究的处理算法。