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Shipboard Test of the Forward Scattering Meter: Preliminary Results (July 1987)

Abstract : A shipboard test of the Forward Scattering Meter (FSM) was conducted aboard the POINT SUR during a cruise off the California coast from July 6 to July 17. This report discusses the performance of the FSM during this period, problems which were encountered in the operation of the FSM, and steps which need to be taken to solve the data problems. Power outages revealed a need for solenoid-driven doors over the transmitter and receiver windows. Strong winds into either window would overcome the flow of clean purging air from the single pump and therefore two pumps should be used, one for the transmitter window and one for the receiver window. A method of monitoring the background level is needed and a telescoping cylindrical sleeve is suggested. 24-hour plots of the FSM data, HSS Visibility-Meter, and Radon concentrations measured during the cruise are given. Keywords: Infrared scattering, Marine atmosphere.