Measurements of plankton distribution in the ocean using submersible holography
Measurements of plankton distribution in the ocean using submersible holography
复制标题
使用潜水全息术测量海洋中浮游生物的分布
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
J. Katz
中科院分区：
文献类型：
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作者：
E. Malkiel;Omar Alquaddoomi;J. Katz
已经开发和部署了一个水下全息照相系统，用于现场记录浮游生物的空间分布。该系统采用红宝石激光器，具有在线记录配置，样品体积为732 ml。重建图像的分辨率范围为10-20 µm（对于球形颗粒）和3 µm（对于距离胶片100 mm以内的线性颗粒）。对最近在格鲁吉亚海峡进行的两次部署中记录的全息图的重建体积进行扫描，以获得颗粒的聚焦图像、它们的位置、大小和方向。颗粒还根据其形态特征分为几组。全息图包括在水柱顶部30米的15分钟垂直断面期间记录的一组。沿着全息图的数据还包括深度、温度、盐度、溶解氧和光学透射率的记录。结果表明，间隔很短的距离，颗粒浓度最大值和附近的密度跃层和浮游动物迁移的证据层之间的人口构成的实质性变化。在硅藻浓度峰值区域，硅藻的水平取向占主导地位。个体全息图显示了不同种类浮游生物的聚集。
A submersible holography system for in situ recordings of the spatial distribution of plankton has been developed and deployed. The system utilizes a ruby laser with an in-line recording configuration and has a sample volume of 732 ml. The reconstructed images have a resolution ranging from 10-20 µm for spherical particles and 3 µm for linear particles that lie within 100 mm from the film. Reconstructed volumes from holograms recorded during two recent deployments in the Strait of Georgia are scanned to obtain focused images of the particles, their position, size and orientation. The particles are also classified to several groups based on their morphological characteristics. The holograms include a set recorded during a 15 min vertical transect of the top 30 m of the water column. Along with the holograms, the data include records of depth, temperature, salinity, dissolved oxygen and optical transmissivity. The results show substantial variations in population makeup between layers spaced a short distance apart, particle concentration maxima at and near a pycnocline and evidence of zooplankton migration. A predominant horizontal diatom orientation is indicated in the region of peak diatom concentration. Individual holograms show clustering within different classes of plankton.