Rahlff, Janina and Stolle, Christian and Giebel, Helge-Ansgar and Ribas-Ribas, Mariana and Damgaard, Lars Riis and Wurl, Oliver (2019) Oxygen Profiles Across the Sea-Surface Microlayer—Effects of Diffusion and Biological Activity. Frontiers in Marine Science, 6. ISSN 2296-7745

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Abstract

Gas exchange across the air-water interface is strongly influenced by the uppermost water layer (<1mm), the sea-surface microlayer (SML). However, a clear understanding about how the distinct physicochemical and biological properties of the SML affect gas exchange is lacking. We used an automatic microprofiler with Clark-type microsensors to measure small-scale profiles of dissolved oxygen in the upper 5 cm of the water column in a laboratory tank filled with natural seawater. We aimed to link changing oxygen concentrations and profiles with the metabolic activity of plankton and neuston, i.e., SML-dwelling organisms, in our artificial, low-turbulence set-up during diel cycles. We observed that temporal changes of the oxygen concentration in near surface water (5 cm depth) could not be explained by diffusive loss of oxygen, but by planktonic activity. Interestingly, no influence of strong neuston activity on oxygen gradients at the air-water interface was detectable.

Item Type:	Article
Additional Information:	Publiziert mit Hilfe des DFG-geförderten Open Access-Publikationsfonds der Carl von Ossietzky Universität Oldenburg.
Uncontrolled Keywords:	oxygen gradients, sea-surfacemicrolayer, microsensors, net community production, gas exchange, neuston, plankton, diffusion
Subjects:	Science and mathematics > Earth sciences and geology Science and mathematics > Life sciences, biology
Divisions:	Faculty of Mathematics and Science > Institute for Chemistry and Biology of the Marine Environment (ICBM)
Date Deposited:	17 Mar 2020 13:11
Last Modified:	17 Mar 2020 13:11
URI:	https://oops.uni-oldenburg.de/id/eprint/4451
URN:	urn:nbn:de:gbv:715-oops-45329
DOI:	10.3389/fmars.2019.00011
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