MEASUREMENT OF VISIBLE LIGHT ABSORPTION BY PARTICULATE MATTER IN THE OCEAN1
MEASUREMENT OF VISIBLE LIGHT ABSORPTION BY PARTICULATE MATTER IN THE OCEAN1
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DOI：
10.4319/lo.1962.7.2.0207
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发表时间：
1962-04
影响因子：
4.5
通讯作者：
C. Yentsch
中科院分区：
文献类型：
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作者：
C. Yentsch
为了测量海水中颗粒的可见光吸收，已经设计了光学装置，其中散射光被集成，并且光电检测器“看到”大部分漫射光。通过使用薄膜过滤器从海水中去除颗粒物质，并在卡里分光光度计中以未使用的过滤器作为参比空白扫描过滤器，获得了高光谱分辨率。用这种方法可以得到海洋中微粒物质的光谱曲线。这些曲线表明，在水体上部100米处有色素条带，这是叶绿体色素吸收的特征。在该深度以下，颗粒物质的吸收的特征在于从长波长到短波长逐渐增加的衰减。光密度比的叶绿体色素带中看到的颗粒物质的上100米建议的吸收成分的存在下，通常不会看到在藻类文化。通过分级过滤器尺寸（5.0 µ-0.3 µ）的差示过滤，然后进行过滤器的光谱扫描，表明几乎所有的叶绿体色素都被5.0 µ过滤器保留。通过该过滤器的颗粒显示出对可见波长的选择性衰减很小。本文讨论了海水颗粒物的吸收特性及其对浮游植物生态学的意义。
For the measurement of visible light absorption by particles in sea water, optical arrangements have been devised where scattered light is integrated and the photodetector “sees” mostly diffused light. High spectral resolution has been obtained by removing particulate matter from sea water using a membrane filter and scanning the filter against an unused filter as the reference blank in the Cary spectrophotometer. In this fashion spectral curves for particulate matter in the oceans have been obtained. These curves show pigment banding in the upper 100 m of water characteristic of absorption by chloroplastic pigments. Below this depth the absorption of particulate matter is characterized by a gradual increasing attenuation from long to short wavelengths. Optical density ratios of chloroplastic pigment bands seen in the particulate matter of the upper 100 m suggest the presence of absorbing components not generally seen in algal cultures. Differential filtration through graded filter sizes (5.0 µ-0.3 µ) followed by the spectral scanning of filters, shows that practically all of the chloroplastic pigments are retained by the 5.0 µ filter. Particles passing this filter show little selective attenuation of visible wavelengths. The nature of sea water particulate matter is discussed in terms of its absorbing characteristics as well as the significance to phytoplankton ecology.