Abstract

In a recent sea test, measurements of the volume scattering function (VSF) of clear sea water in situ at several angles were made. These measurements used the APL backscattering sensor, which measures the VSF at 170 degree(s); the SRI Beta Pi sensor, which measures the VSF from 179 degree(s) to 180 degree(s); and the SRI backscattering sensor, which measures the VSF at a mean scattering angle of 150 degree(s). The intention of the testing was to quantify the enhanced backscattering feature at 180 degree(s) relative to the scattering at more traditionally measured angles of the VSF. Measurements were made in both clear ocean water and Hawaiian coastal waters. Analysis of the data has been combined with subsequent laboratory instrument intercomparisons to demonstrate that in clear ocean water there is relatively little enhanced backscattering, whereas in more turbid coastal water the feature is pronounced and is clearly higher than the VSF at 170 degree(s). Field data, including vertical profiles of optical backscatter in clear and coastal waters, are shown.

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