Annual Absolute Velocity Structure Along AR7W in the Labrador Sea Since 1995

1995 年以来拉布拉多海 AR7W 沿线的年绝对速度结构

• 批准号: 0622640
• 负责人: Melinda Hall
• 金额: $ 44.8万
• 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: 2006
• 资助国家: 美国
• 起止时间: 2006-10-01 至 2012-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0622640&HistoricalAwards=false
• 关键词: Annual; Absolute; Velocity; Structure; Along

Annual Absolute Velocity Structure along AR7W in the Labrador Sea since 1995 This project involves processing and analyzing lowered and shipboard acoustic Doppler current meter (LADCP, SADCP) velocity data that have been collected along a transect of the Labrador Sea ("AR7W"), usually once each year in spring/early summer, since 1995. This transect crosses the southern part of the region of strong convection that occurs most winters in the Labrador Sea. Hydrographic data were also collected on these cruises, allowing for the computation of absolute velocity fields for the transects in two ways: using the ADCP data alone, and using it in conjunction with the hydrographic data. In addition, the combination of absolute velocity and hydrographic data can be used to evaluate the heat flux across this transect. The goals of this project, using these results, are: 1) to quantify the relationships between the strength of the circulation, the strength of convection, and forcing parameters; 2) to evaluate the various components of meridional heat transport across AR7W and relate them to deep convection and boundary current strength; and 3) to examine the continuity of the Labrador Current/Deep Western Boundary Current around the Grand Banks. Also, as part of this project, the LADCP instrument will continue to be sent on these annual cruises, so that this time series can be extended through at least 2010: this is important because interdecadal variability in the region is expected to be significant. The processed lowered ADCP datasets will be made public in a timely manner, through a website, while the shipboard ADCP data will be submitted to both the national Canadian archive as well as the NODC JASADCP. The Labrador Sea continues to be an area of active research, and indeed our project complements other programs recently funded for this geographical region. Furthermore, although we plan to address specific scientific questions with this dataset, the public availability of the velocity observations may stimulate additional research opportunities for scientists and students in this and related fields.

1995年以来拉布拉多海沿着AR 7 W的年度绝对速度结构该项目涉及处理和分析自1995年以来沿着拉布拉多海（“AR 7 W”）横断面收集的降低和船上声学多普勒流速计（LADCP、SADCP）速度数据，这些数据通常每年在春季/初夏收集一次。 该样带穿过拉布拉多海冬季大部分时间发生的强对流区域的南部。在这些航行中还收集了水文数据，以便以两种方式计算断面的绝对速度场：单独使用ADCP数据，以及结合水文数据使用ADCP数据。此外，绝对流速和水文数据的组合可以用来评估该样带的热通量。 利用这些结果，本项目的目标是：1）量化环流强度、对流强度和强迫参数之间的关系：2）评估穿越AR 7 W的对流热输送的各个分量，并将它们与深对流和边界流强度联系起来;（3）考察大浅滩周围拉布拉多海流/深西部边界海流的连续性。 此外，作为这一项目的一部分，将继续在这些年度航行中发送土地退化和沿海地区方案仪器，以便这一时间序列至少可以延长到2010年：这一点很重要，因为预计该区域的十年间变化很大。处理后的降低ADCP数据集将通过网站及时公开，而船上ADCP数据将提交给加拿大国家档案馆和NODC JASADCP。 拉布拉多海仍然是一个活跃的研究领域，事实上，我们的项目补充了最近为这一地理区域资助的其他项目。 此外，虽然我们计划用这个数据集来解决具体的科学问题，但速度观测的公开可用性可能会为科学家和学生在这个领域和相关领域带来更多的研究机会。