4. To identify the natural or anthropogenic origin of Pb in marine aerosols by means of Pb isotope tracers and mass balance relationships of present atmospheric input. fluxes with prehistoric sediment output fluxes. 5. To investigate in detail, using classical as well as sophisticated laser fluorescence techniques, the distribution and exchange between the particulate and vapor phase of organics and of the relatively volatile heavy metals such as Pb, Cd, Zn, Se, Sb, As, Cu, Hg, and . Ag. 6. To investigate bubble surface area and volume spectra in the sea and the relative importance of single bubbles and bubble rafts as sources of atmospheric spray and sea salt particles, both as a function of wind speed. We propose to undertake this sea/air exchange research program with a group of twelve senior co-investigators from eight institutions: Dr. R. Chesselet, CFR/CNRS, France Dr. R. Duce, University of Rhode Island Dr. J. Fasching, University of Rhode Island Dr. W. Fitzgerald, University of Connecticut Dr. R. Gagosian, Woods Hole Oceanographic Institution Dr. C. Giam, Texas A & M University Dr. E. Goldberg, Scripps Institute of Oceanography Dr. E. Kraus, University of Miami Dr. C. Patterson, California Institute of Technology Dr. J. Prospero, University of Miami Dr. K. Turekian, Yale University Dr. QO. Zafiriou, Woods Hole Oceanographic Institution sett. ree cr Dy Se eee SRERE oder eaeneSaeeeOaSeteee ON Fe ne OE Or ht a " a7 SeeNTE OMe MRE oa " RET