weight compounds such as ketones, aldehydes, and carboxylic acids to the ocean surface. | a elle vatagnhAtk ot anarte Biante.” ne wae snendtee The identification of the sources for these substances in the marine atmosphere. The investigation of mechanisms of exchange of these substances across the sea/air interface. We propose a five year program to implement this study, with an initial’ two year funding period requested in this proposal. SEAREX will be undertaken as a closely coordinated field and laboratory study with common field and experimental facilities. 1. Specifically, we propose: To estimate from rain and dry deposition measurements the flux of heavy metals and organic substances during the wet and dry seasons at Tern Island, French Frigate Shoals in the North Pacific trades and at Tutuila Island, American Samoa in the South Pacific trades. To investigate the importance of the ocean as a source for atmospheric heavy metals and organic substances through enrichment and fractionation effects occurring during the production of atmospheric sea salt particles by bursting bubbles. These studies will be undertaken using the Bubble Interfacial Microlayer Sampler (BIMS) developed at the University of Rhode Island (URI) in the earlier u5 at ? NSF/IDOE-PTP, together with an assessment of the natural occurrence of bubbles under varying conditions. To evaluate the significance of soil and vegetation emissions, forest fires, and chemical manufacturing sites as sources of the volatile metals and organic substances found in the marine atmosphere.