In the 1970's, a temperature recorder was added to the surveys and in the 1980's, salinity, chlorophyll,turbidity, and irradiance measurements were incorporated. Apparently, the survey results are assuming greater significance since the data base extends from a period before marine pollution and before climatic effects were as pronounced as they are today. I will relate the pertinent details of the instruments individually in the following paragraphs. Optics PML is involved in SeaWiFs calibration efforts. To this end, they are developing a towed instrument platform equipped with a complete suite of optical sensors.
Tests remain to prove hydrodynamic stability.
Increasing speed over 12kt decreases profile depth. Data are recorded on board using a microprocessor controlled solid state data logger. Dr. Aiken assured me of at least knowledge of each others work and will promote close cooperation. PML's work seems to answer some of the questions NRL has concerning collecting optical data while towing in the wake of a moving vessel. At 15 to 20 m astern, the noise practically disappeared.