IV. SCOPE OF THE rIVE YEAR PROGRAM To attain the objectives outlined above a series of coordinated field experiments over a five year period are proposed. five year program is presented in Figure 1. A timetable for this Details concerning the various experiments are presented in Section V. of this overview and additional information is contained in the individual proposals which follow in later sections. The coordinated field experiments fall basically into two categories: (a) Flu experiments, where estimates of the atmospheric dry and wet deposition of the various chemical substances to the ocean surface are made from measure-— ments in rain and dry deposition samples and (b) Source experiments, where the ocean is investigated as a source for these substances through the bubble breaking process using the Bubble Interfacial Microlayer Sampler combined with simultaneous bubble area/sea salt particle size and number distribution measurements, and where vegetation, soil emissions, and forest fires are investigated as a source for these substances in the atmosphere. A. Flux Experiments The initial flux experiment is designed to test the various meteoro- logical, atmospheric sampling, and rain/dry deposition systems in an environ- ment similar to open ocean conditions but located near participating laboratories and with relatively high expected concentrations and fluxes (thus minimizing analytical problems). This experiment will take place in May-June 1978 for three weeks, at Pigeon Key, Florida. The first remote field flux experiment will take place in the North Pacific at Tern Island, French Frigate Shoals, in the northwestern Hawaiian Islands (hereafter referred to as Hawaii). Site evaluation for this location will take place in October, 1977; construction of the tower and building facility in August-September, 1978;