In April 1990 two fiber optic hydrophones were used to measure the ambientacoustic noise under shore-fast ice at the mouth of Independence Fjord in the vicinity of Kap Eiler Rasmussen, Greenland. The hydrophones were fiber Mach Zehnder interferometers operating at 1.3 microns, one device was powered with a semiconductor diode laser source, the other with a diode pumped Nd:YAG laser source. The electro-optic system (lasers, detectors, and electronics) was located in a shelter on the ice, the hydrophones were interrogated over 2 km of fiber optic cable. Measurements of the ambient noise were made over a 9 day period and contained data ranging from substantially below sea state zero to high noise levels due to the presence of machinery. Keywords: Hydrophones; Fiber optics; Ambient noise. (RH)
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