Imperial College London
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DrAdrianCallaghan

Faculty of Engineering, Department of Civil and Environmental Engineering

Senior Lecturer (Royal Society Shooter International Fellow)
 
 
 
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Contact

 

+44 (0)20 7594 6644a.callaghan Website

 
 
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Assistant

 

Miss Rebecca Naessens +44 (0)20 7594 5990

 
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Location

 

Skempton BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Callaghan:2017:10.1002/2017JC012809,
author = {Callaghan, AH and Deane, GB and Stokes, MD},
doi = {10.1002/2017JC012809},
journal = {Journal of Geophysical Research: Oceans},
pages = {6110--6128},
title = {On the imprint of surfactant-driven stabilization of laboratory breaking wave foam with comparison to oceanic whitecaps},
url = {http://dx.doi.org/10.1002/2017JC012809},
volume = {122},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Surfactants are ubiquitous in the global oceans: they help form the materiallydistinct sea surface microlayer (SML) across which global oceanatmosphere exchanges take place, and they reside on the surfaces of bubbles and whitecap foam cells prolonging their lifetime thus altering ocean albedo. Despite their importance, the occurrence, spatial distribution, and composition of surfactants within the upper ocean and the SML remains undercharacterized during conditions of vigorous wave breaking when insitu sampling methods are difficult to implement. Additionally, no quantitative framework exists to evaluate the importance of surfactant activity on ocean whitecap foam coverage estimates. Here we use individual laboratory breaking waves generated in filtered seawater and seawater with added soluble surfactant to identify the imprint of surfactant activity in whitecap foam evolution. The data show a distinct surfactant imprint in the decay phase of foam evolution. The areatimeintegral of foam evolution is used to develop a timevarying stabilization function, urn:x-wiley:21699275:media:jgrc22369:jgrc22369-math-0001 and a stabilization factor, urn:x-wiley:21699275:media:jgrc22369:jgrc22369-math-0002, which can be used to identify and quantify the extent of this surfactant imprint for individual breaking waves. The approach is then applied to winddriven oceanic whitecaps, and the laboratory and ocean urn:x-wiley:21699275:media:jgrc22369:jgrc22369-math-0003 distributions overlap. It is proposed that whitecap foam evolution may be used to determine the occurrence and extent of oceanic surfactant activity to complement traditional insitu techniques and extend measurement capabilities to more severe sea states occurring at wind speeds in excess of about 10 m/s. The analysis procedure also provides a framework to assess surfactantdriven variability within and between whitecap coverage data sets.
AU  - Callaghan,AH
AU  - Deane,GB
AU  - Stokes,MD
DO  - 10.1002/2017JC012809
EP  - 6128
PY  - 2017///
SN  - 2169-9275
SP  - 6110
TI  - On the imprint of surfactant-driven stabilization of laboratory breaking wave foam with comparison to oceanic whitecaps
T2  - Journal of Geophysical Research: Oceans
UR  - http://dx.doi.org/10.1002/2017JC012809
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000410790600004&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2017JC012809
UR  - http://hdl.handle.net/10044/1/69242
VL  - 122
ER  -
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