Cambuzat, A. Department of Civil and Environmental Engineering, UCLA,
Stolzenbach, K. Department of Civil and Environmental Engineering, UCLA,

The water-surface microlayer, generally defined as the upper millimeter of a water body, is characterized by enriched concentrations of various constituents, such as trace metals or organic material, and may provide a unique habitat for aquatic organisms. After correction for variable dilution by different sampling techniques, enrichments of microlayer particulate concentrations observed by previous studies tend to be remarkably similar among constituents with quite different chemical properties. A mass balance model of physical transport processes between the atmosphere and the water predicts enrichment factors of particulate constituents very similar to these observed values, suggesting that physical rather than chemical processes may regulate microlayer enrichment of particle-associated constituents. The dominant process adding material to the microlayer is flotation by bubbles, particularly at high wind speeds. Atmospheric deposition may be significant at lower wind speeds if larger particles are present in the air and if the ratio of atmospheric to bulk water particle concentration is sufficiently high.
Day: Wednesday, Feb. 3
Time: Poster
Location: Sweeney Center
Code: SS03WE0097S