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Near-surface physics during convection affecting air-water gas transfer

Conference paper
Authors Sam Fredriksson
Lars Arneborg
Håkan Nilsson
Robert Handler
Published in IOP Conference Series: Earth and Environmental Science
Volume 35
Issue 1
Pages 012007
ISSN 1755-1307
Publication year 2016
Published at Department of marine sciences
Pages 012007
Language en
Links dx.doi.org/10.1088/1755-1315/35/1/0...
Subject categories Oceanography

Abstract

The gas flux at the water surface is affected by physical processes including turbulence from wind shear, microscale wave breaking, large-scale breaking, and convection due to heat loss at the surface. The main route in the parameterizations of the gas flux has been to use the wind speed as a proxy for the gas flux velocity, indirectly taking into account the dependency of the wind shear and the wave processes. The interest in the contributions from convection processes has increased as the gas flux from inland waters (with typically lower wind and sheltered conditions) now is believed to play a substantial role in the air-water gas flux budget. The gas flux is enhanced by convection through the mixing of the mixed layer as well as by decreasing the diffusive boundary layer thickness. The direct numerical simulations performed in this study are shown to be a valuable tool to enhance the understanding of this flow configuration often present in nature.

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