Bubbles
generated in the sea surface waters during moderate and high wind speed
conditions create whitecaps at the sea surface and produce sea salt aerosols.
During the rise in the water column bubbles also selectively scavenge some
water constituents that enrich the sea surface micro layer and sea derived aerosols. The production ofbubbles in the water intensifies with the increase in wind speed . In addition,
field and laboratory experiments confirmed that the production of bubbles in
sea water and the related generation of sea-derived aerosol droplets increase
with the degree of dissolved gases supersaturation. Bubbles in the surface
waters are mainly produced by breaking wave events, which are generated by the
overturn of unstable wave crests. However, the most enhanced production of
bubbles and related generation of sea salt aerosols occurs under rainy and
windy weather conditions.
Typical
breaking wave-induced attenuation depth of bubbles in the sea surface water is
c. 1 m while rain droplets attenuate bubbles to the depth of c. 20 cm The size
of the breaking wave mediated bubbles in the oceanic water ranges from about 1
μm to a few mm in radius, although their average occurrence radius is about 25
μm.The
depth of bubble dispersion in the water column increases with growing water
temperature. Immediately after dispersion in the water column, bubbles tend to
rise according to their volume related buoyancy. During the rise in the water
column, bubbles may gradually grow in size, especially under the conditions of
supersaturation with respect to dissolved gases. Read more...........
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