Cyclesonde automation profiling devices were deployed in the Fram Straits marginal ice zone during the summers of 1983 and 1984 as a part of the Marginal Ice Zone Experiment (MIZEX). Each cyclesonde took a vertical profile of the upper 200 meters of the water column once each hour along a weighted wire hung over the edge of a free drifting ice floe. The instrumented floes were tracked by ARGOS. About 1350 profiles were recorded to 3-m vertical resolution showing vertical structure in current, temperature, electrical conductivity, light transmission and light intensity. Data were recorded on magnetic tape cassettes within each cyclesonde and also transmitted by VHF radio telemetry for recording on ship board.
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