Thursday, 13 February 2003: 11:00 AM
Aerosols, bubbles and sea spray production studies during the RED experiments
Aerosol and bubble measurements were undertaken during the RED (Rough Evaporation Duct) experiment in August/September 2001. RED took place at the Pacific at six miles from the northeast shore of Oahu, Hawaii. The measurements described here were made from the moored Floating Marine Physical Laboratory's Research Platform Floating Instrument Platform (FLIP). Aerosol size distributions were measured with optical particle counters. A volatility system was used to characterize the aerosol components, in particular to obtain information on the contribution of sea spray to the aerosol spectra. In combination with measured bubble size distributions, this information is used to study the bubble-mediated production of sea spray particles. An aerosol transport model is used to relate the derived source functions and measured concentrations. Backward trajectories show that the air masses encountered during the measurements had been over the ocean for at least three days, thus reducing the influence of continental sources. Results are compared with 'accepted' source functions currently used in, e.g., chemistry transport models.