Sea foam as an object of sea-surface film studies

Druzhkov, N. V.; Makarevich, Pavel R; Bardan, S. I.

doi:10.3402/polar.v16i2.6630

Cited by 5 publications

(4 citation statements)

References 18 publications

(14 reference statements)

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“…Such intensive foaming has been reported, for example: around kelp beds on the South African west coast (Velimirov, 1982); in the North Sea and Eastern English Channel (Bätje and Michealis, 1986;Desroy and Denis, 2004;Seuront et al, 2006) after blooms of Phaeocystis sp. ; in the Barents Sea (Druzhkov et al, 1997), and around the Pacific Ocean Island of Cano after dinoflagellate blooms (Guzmán et al, 1990). Further information about the org-C and org-I compounds involved in such events would be useful.…”

Section: The Results Accord With Wider Industrial and Environmentalmentioning

confidence: 99%

Circumstantial evidence in support of org-I as a component of the marine aerosol arising from a study of marine foams

Truesdale

Žic

Garnier

et al. 2012

Estuarine, Coastal and Shelf Science

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. a b s t r a c tA study of foams formed on the marine Lake Mir, Croatia, and elsewhere on the same coast demonstrates, for the first time, that they are fractionated (enrichened) in org-I by up to 630 times relative to the water from which they form. The results are consistent with an I/C mole ratio for in-situ organic matter. Foams created artificially in the laboratory from natural samples of water from Lake Mir were similarly fractionated, although to a lesser degree. These differences were effectively removed when enrichments were expressed as molar ratios, e.g., P tot /I tot , rather than straightforward concentrations. This similarity in the behaviour to enrichment for organic forms of I, N and P suggests that the time over which foams age is a major determinant of the enrichment they display. It is argued that this period allows time for the seawater occluded in the interstitial spaces between bubbles, to drain away. Since foam production is ubiquitous over the oceans it seems likely that this process local to coastal environments is much more common than at first might appear to be the case. The paper explains how this work provides circumstantial evidence that the bubble-bursting mechanism current since the 1960s may well provide the iodine which appears to be missing in many modelling calculations based upon an atmospheric system dependant upon sorption of the species IO upon the marine aerosol.

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Section: The Results Accord With Wider Industrial and Environmentalmentioning

confidence: 99%

Circumstantial evidence in support of org-I as a component of the marine aerosol arising from a study of marine foams

Truesdale

Žic

Garnier

et al. 2012

Estuarine, Coastal and Shelf Science

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“…From an ecological perspective, seafoam is an important habitat for marine microorganisms, which show an increased presence in seafoam compared to the pelagic zone. 64,65 An enhanced foam stability increases the chances of these nutrients moving up the food chain. 66…”

Section: Resultsmentioning

confidence: 99%

Impact of microplastic pollution on breaking waves

Bergfreund,

Wobill,

Evers

et al. 2024

Physics of Fluids

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Anthropogenic plastic waste heavily pollutes global water systems. In particular, micron-sized plastic debris can have severe repercussions for the ocean flora and fauna. Microplastics may also affect physical processes such as wave breaking, which are critical for air–sea interaction and albedo. Nevertheless, the effects of micron-sized plastic debris on geophysical processes are widely unexplored. Herein, we investigate the effect of microplastic collected from the North Pacific and a surfactant mimicking surface active materials present in the ocean on the stability of foam generated by breaking wave experiments. We found that microplastic particles increase foam stability. In particular, an increased foam height was found in a column foaming setup, while an increased foam area was observed in a laboratory-scale breaking wave channel. We propose that microplastic particles assemble at the air–water interface of foam bubbles, form aggregates, presumably decrease the liquid drainage in the liquid film, and thus change the lifetime of the liquid film and the bubble. The effect of surfactants is generally larger due to their higher surface activity but still in a range where synergistic effects can be observed. Our results suggest that microplastic could influence oceanic processes essential for air–sea interaction, sea spray formation, and albedo.

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“…However, a thorough characterization of foam microbial community composition compared with the SML and ULW has never been performed. Using a microscopic approach, Druzhkov, Makarevich and Bardan ( 1997 ) found a highly identical composition of heterotrophs (nanoflagellates <5 µm and bacteria), nano- and microphytoplankton in foam and the SML. The authors further described higher abundances (one order of magnitude) of autotrophs, but not of heterotrophs in foams compared with the SML.…”

Section: Introductionmentioning

confidence: 99%

Sea foams are ephemeral hotspots for distinctive bacterial communities contrasting sea-surface microlayer and underlying surface water

Rahlff

Stolle

Giebel

et al. 2021

FEMS Microbiology Ecology

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The occurrence of foams at oceans’ Surfaces is patchy and generally short-lived but a detailed understanding of bacterial communities inhabiting sea foams is lacking. Here we investigated how marine foams differ from the sea-surface microlayer (SML), a <1 mm thick layer at the air-sea interface and underlying water from 1 m depth. Samples of sea foams, SML and underlying water collected from the North Sea and Timor Sea indicated that foams were often characterized by a high abundance of small eukaryotic phototrophic and prokaryotic cells as well as a high concentration of surface-active substances (SAS). Amplicon sequencing of 16S rRNA (gene) revealed distinctive foam bacterial communities compared to SML and underlying water, with high abundance of Gammaproteobacteria. Typical SML dwellers such as Pseudoalteromonas and Vibrio were highly abundant, active foam inhabitants and thus might enhance foam formation and stability by producing SAS. Despite a clear difference in the overall bacterial community composition between foam and SML, the presence of SML bacteria in foams supports previous assumptions that foam is strongly influenced by the SML. We conclude that active and abundant bacteria from interfacial habitats potentially contribute to foam formation and stability, carbon cycling and air-sea exchange processes in the ocean.

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Sea foam as an object of sea-surface film studies

Cited by 5 publications

References 18 publications

Circumstantial evidence in support of org-I as a component of the marine aerosol arising from a study of marine foams

Circumstantial evidence in support of org-I as a component of the marine aerosol arising from a study of marine foams

Impact of microplastic pollution on breaking waves

Sea foams are ephemeral hotspots for distinctive bacterial communities contrasting sea-surface microlayer and underlying surface water

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