Nonmethane Hydrocarbon and Selected Halocarbon Measurements During the ACE-1 Lagrangian Experiments

Barkley C. Sive, Oliver W. Wingenter, Donald. R. Blake, Nicola J. Blake, and F. Sherwood Rowland (Department of Chemistry, University of California, Irvine, CA 92697-2025; 714-824-5457; e-mail: bcsive@uci.edu)

Nonmethane hydrocarbon (NMHC) and halocarbon gases were measured in whole air samples collected aboard the NCAR C-130 aircraft during the two Lagrangian Experiments performed as part of the Southern Hemisphere Marine Aerosol Characterization Experiment (ACE-1). Both Lagrangian Experiments took place south of Hobart, Tasmania. Lagrangians A and B each consisted of three approximately 9 hour flights made during December 1-2, and December 7-8, 1995, respectively. Vertical and horizontal trace gas gradients determined for each flight will be discussed, as well as any significant changes observed between consecutive Lagrangian flights. Estimated fluxes of CH₃I from the ocean to the atmosphere will also be presented.