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Updated: Sep 7, 2026

Chemotactic Response of Marine Micro-Organisms to Micro-Scale Nutrient Layers
Published on: May 27, 2007
Studies on the sea surface microlayer. II. The layer of sudden change of physical and chemical properties
Zhengbin Zhang1, Liansheng Liu, Chunying Liu
1The Institute of Marine Chemistry, The Ocean University of China, Qingdao 266003, China. zhangzb@mail.ouc.edu.cn
Abstract:
Seawater samples of the sea surface microlayer were obtained from the ocean, coastal waters, and laboratory imitation experiments adopting glass plate, rotating drum, screen, and funnel samplers. The result was that surface microlayer samples of thickness 50 microm could be taken, not by the popular screen and funnel techniques, but by glass plate or rotating drum techniques. The layer of sudden change of physical and chemical properties in the surface microlayer was found at 50 microm below the sea-air interface. These physical and chemical properties included tens of physical and chemical parameters, such as concentrations of organic matter, nutrients, and dissolved trace metals, biochemical oxygen demand, chemical oxygen demand chlorophyll-a, surface tensions, and pH. Therefore, it was suggested that the layer of sudden change of physical and chemical properties in surface seawater should serve as a basis for defining the sea surface microlayer should, and be regarded as the practical operational thickness of the sea surface microlayer. The apparent sampling thickness of the sea surface microlayer from surface seawater should be 50+/-10 microm.
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