A new tool is developed to provide deep ocean microstructure measurements in combination with standard CTD profiling/water sampling with only a minor increase in deployment time. A microstructure probe is mounted on a standard Rosette system like a sampling bottle. The probe is carried down to a proper depth attached to the Rosette that is performing water sampling and CTD profiling. When the desired depth is reached, the probe is detached from the Rosette using the bottle firing system and begins microstructure measurements in free-falling mode. During its free fall, the probe remains linked with the Rosette by a serviceable thin flexible cord to provide fast recovery. The cord does not disturb the free falling owing to free running from the probe. Turbulent velocity fluctuations are measured by an airfoil sensor. Such regime of microstructure measurements was realized in a cruise of R/V «Maria S. Merian», May-June 2009, performed under the EU 7th Framework Programme Priority Project «Thermohaline Overturning — at Risk?» (THOR). The microstructure measurements were done in the course of CTD surveying of the Danish Strait overflow. Bottom intrusion of cold/dense overflow water propagating downhill from the Danish Strait Sill was found to be characterized by a high level of turbulent velocity fluctuations while in the above lying layers the turbulence was suppressed.
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机译:开发了一种新工具来提供深海微观结构测量,并与标准的CTD剖析/水采样相结合,而部署时间却仅增加了一点点。将微结构探针安装在标准Rosette系统上,例如取样瓶。探针被向下拖到与执行水取样和CTD轮廓分析的玫瑰花结附连的适当深度。当达到所需的深度时,使用瓶子发射系统将探针从玫瑰花结上取下,并开始以自由落体模式进行微观结构测量。在自由下落期间,探头通过可维护的细软线与玫瑰花结保持链接,以提供快速恢复。电缆不会由于探头的自由运转而干扰自由落体。湍流速度波动由翼型传感器测量。在欧盟第七框架计划优先项目“ Thermohaline倾覆-处于危险之中?”下,R / V“ Maria S. Merian” R / V巡洋舰(2009年5月至6月)实现了这种微观结构测量方法。 (雷神)。在丹麦海峡溢流的CTD测量过程中进行了微观结构测量。发现从丹麦海峡基岩向下传播的冷/稠密溢流水的底部侵入具有湍流速度波动高的特征,而在上述各层中湍流得到抑制。
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