83rd Annual

Thursday, 13 February 2003
Sea spray aerosol fluxes measured on R/P FLIP during the RED project
Michael H. Smith, University of Leeds, Leeds, United Kingdom; and B. J. Brooks and J. Reid
Despite many years of investigation, considerable uncertainty remains regarding the magnitude and variability with wind speed of the sea spray aerosol source function. For the Rough Evaporation Duct (RED) experiment, during August and September 2001, the Scripps Institution of Oceanography vessel R/P FLIP was moored 6 miles off the northeast coast of Oahu. For this project, Particle Measuring Systems PCASP and FSSP instruments were operated at approximately 10m above the ocean surface alongside a Solent R3 ultrasonic anemometer to measure the prevailing aerosol particle spectrum and the ambient three-dimensional wind field. The PCASP and the FSSP cover particle radii from 0.04 to 1.50Ám and 0.5 to 16Ám, respectively. The particle spectra and 3-D wind components were sampled at a 10Hz rate. Prevailing wind speeds of about 10 m/s throughout most of the project meant that particle concentrations were lower than expected and generally substantially lower than those encountered in, for example, the North Atlantic. However, attempts are being made to obtain direct measurements of the sea spray aerosol fluxes from these observations for comparison with estimates published in the literature which have been derived by a number of different methodologies.

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