Accession Number : ADA335352

Title :   Laboratory Measurements of the Water/Air Flux of Dimethylsulfide Using a Wind/Wave Tank

Descriptive Note : Final rept. 1 May 95-31 Dec 96

Corporate Author : WOODS HOLE OCEANOGRAPHIC INSTITUTION MA

Personal Author(s) : Dacey, John W. ; Frew, Nelson M.

PDF Url : ADA335352

Report Date : JAN 1998

Pagination or Media Count : 8

Abstract : The flux of dimethylsulfide (DMS) from the surface water of the ocean to the atmosphere is an important biogeochemical problem, since DMS contributes to optical haze and potentially impacts global climate by influencing earth's albedo. DMS is also an interesting gas in terms of gas exchange. The rate of flux of a gas across the air-water interface is regulated by its diffusivity and by the hydrodynamics of the two sublayers on either side of the interface. The fluxes of permanent gases are typically controlled by the rate of transport to the surface of the water film, and hence are called "water-side" controlled. The hydrodynamics of the aqueous sublayer are not as important in controlling fluxes of highly soluble gases, which are controlled by transport through the atmospheric sublayer above the interface. Our project indicates that the flux of DMS is transitional; at low wind speeds and in warm water, its flux is water-side controlled; at higher wind speeds in cold water, DMS flux has a significant component of air-side control. Under these latter conditions, flux models as they are usually applied may overestimate flux by 60%. We developed a coefficient, gamma a to characterize the contribution of air-side control to flux.

Descriptors :   *FLUX(RATE), *WIND VELOCITY, *SULFUR, *OCEANS, *AIR WATER INTERACTIONS, CLOUDS, OPTICAL PROPERTIES, RADIATION, WATER WAVES, AEROSOLS, FILMS, GASES, MARINE ATMOSPHERES, SURFACE WATERS, TRANSPORT, CLIMATE, LABORATORY PROCEDURES, SULFATES, SOLUBILITY, EARTH(PLANET), HYDRODYNAMICS, SUBSURFACE, COLD WATER, HAZE, ALBEDO, ORGANIC SULFUR COMPOUNDS.

Subject Categories : Atmospheric Physics
      Organic Chemistry
      Physical and Dynamic Oceanography
      Hydrology, Limnology and Potamology

Distribution Statement : APPROVED FOR PUBLIC RELEASE