3 shows a vertical scan on the same day. The virga falling out of the low level clouds is evident. Including these effects in optical models will be a challenge as little or nothing is known about their spatial and temporal distribution. The scattering coefficients of these plumes are of smaller magnitude than those observed from the islands at Makai Pier and show substantial temporal variation. The black lines are due to RF interference at the Bellows site causing occasional false triggers in the data acquisition system.
Similar features appear at both wavelengths.
Analysis of the differences between the two distributions will proceed when we have absolute calibrations at both wavelengths. The aerosol anomalies apparent in Figure 6 were also detected by instruments located on the adjacent Bellows tower operated by Dr. Clarkes group. Figure 7 shows a sample of one of these records. Again at this site, it appears that much of the coastal scattering is caused by cloud related processes. This is somewhat surprising as we expected more contribution from ocean-generated spray.