环境水（除海水）物理指标>其它检测 | 在风浪通道实验中的深入了解表面有机物微层-北京欧兰科技发展有限公司

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应用领域	环保
检测样本	环境水（除海水）
检测项目	物理指标>其它
参考标准	0

采用立陶宛Ekspla公司的振动和频光谱测量系统（VSFG）对海洋水样品进行检测，获得了在风浪通道实验条件下，表面有机物微层的信息。

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配置单

Ekspla SFG 表面和频光谱分析系统
型号：SFG

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方案详情

The surface microlayer (SML) is the uppermost thin layer of the ocean and influencing
interactions between the air and sea, such as gas exchange, atmospheric deposition and
aerosol emission. Organic matter (OM) plays a key role in air-sea exchange processes,
but studying how the accumulation of organic compounds in the SML relates to
biological processes is impeded in the field by a changing physical environment, in
particular wind speed and wave breaking. Here, we studied OM dynamics in the SML
under controlled physical conditions in a large annular wind wave channel, filled with
natural seawater, over a period of 26 days. Biology in both SML and bulk water was
dominated by bacterioneuston and -plankton, respectively, while autotrophic biomass
in the two compartments was very low. In general, SML thickness was related to
the concentration of dissolved organic carbon (DOC) but not to enrichment of DOC
or of specific OM components in the SML. Pronounced changes in OM enrichment
and molecular composition were observed in the course of the study and correlated
significantly to bacterial abundance. Thereby, hydrolysable amino acids, in particular
arginine, were more enriched in the SML than combined carbohydrates. Amino acid
composition indicated that less degraded OM accumulated preferentially in the SML.
A strong correlation was established between the amount of surfactants coverage
and g-aminobutric acid, suggesting that microbial cycling of amino acids can control
physiochemical traits of the SML. Our study shows that accumulation and cycling of
OM in the SML can occur independently of recent autotrophic production, indicating a
widespread biogenic control of process across the air-sea exchange.

上一篇在一个双稳湍流涡旋火焰中，对间歇性动态的时间-频率定位

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