Determination of apparent sampling thickness of sea surface microlayer
- 73 Downloads
In situ and laboratory studies of sea—surface microlayer sampling methods using glass plate, rotating drum, screen and funnel samplers were conducted. For glass plate and rotating drum samplers, surface microlayer samples of different thickness were collected by controlling their withdrawal rate and rotating rate. The relationships between pH, surface tension, the concentration of dissolved trace metals Cu and Pb, phosphate, particulate matters and sampling thickness were carefully investigated. It was shown that physicochemical and biological properties change obviously at the sampling thickness of about 50 μm, which is consistent with the mean thickness of the boundary film in the models of gas exchange across the sea surface. It is proposed that the apparent sampling thickness of the surface microlayer should be less than 40 μm. The factors affecting the sampling thickness are discussed, and the feasibility and applicable conditions for different sampling methods are evaluated.
Key wordsea surface microlayer glass plate rotating drum apparent sampling thickness
Unable to display preview. Download preview PDF.
- Baier, R. E., Groupil, D. W., Perlmutter, S. et al., 1974. Dominant chemical composition of sea—surface films, natural slicks, and foams.J. Rech. Atoms. 8: 571–600.Google Scholar
- Daumas, R. A., Laborde, P. L., Marty, J. C. et al., 1976. Influence of sampling method on the chemical composition on water surface films.Limnol. Oceanogr.,21:319–326.Google Scholar
- Garret, W. D., 1965. Collection of slick forming materials from the surface of the sea.Limnol. Oceanogr. 10: 602–605.Google Scholar
- Tsunogai, S., Tanaka, N., 1980. Flux of oxygen across air—sea interface as determined by the analysis of dissolved components in sea water.Geochem. J. 14: 227–234.Google Scholar
- Zhang Zhengbin, Niu Zengyuan, Yang Guipeng et al., 1996. Studies of Chemical Processes of Nansha Island Waters. Science Press. Beijing, 152 p.Google Scholar