Large particulate matter concentration, biovolume, and sized distribution in the Pacific Ocean from 2015-04-11 to 2015-06-18 measured by the Underwater Vision Profiler 5 (UVP5) on the P16N Repeat Hydrography cruise aboard the NOAA Ship Ronald H. Brown

<p>The Underwater Vision Profiler (UVP5) is an underwater camera system that was designed to record the vertical distributions of large aggregates and zooplankton (&gt; 102&nbsp;µm) down to 6000 m. Two units that consist of red-light emitting diodes (LEDs) illuminate (in 100 µsecond&nbsp;flashes) an area of 4 X 20 cm which provides a volume sampling of ~1L per frame. The UVP5&nbsp;was mounted on the bottom of each CTD rosette and collected data on each CTD cast (data are collected during the down cast). The methodology generally follows Picheral et al., 2010.</p>

水下视觉剖面仪（Underwater Vision Profiler，UVP5）是一款水下摄像系统，旨在记录大型聚集体与粒径大于102微米的浮游动物的垂直分布，最大探测深度可达6000米。该系统配备两套由红光发光二极管（red-light emitting diodes，LEDs）组成的照明单元，以100微秒的闪光时长照射4×20厘米的采样区域，单帧可实现约1升体积的采样。UVP5安装于每台温盐深采水架（CTD rosette）的底部，在每一次CTD投放剖面过程中采集数据（数据采集于下行剖面阶段）。其采样方法总体遵循Picheral等人2010年的研究成果。