Mostly, but large keels would cause bouncebacks or block the sound in some cases. the low salinity of arctic water would also affect the thermocline and sound propagation.
The main factor, as I already mentioned is the low ambient noise. its dead quiet under the ice, making other sounds stand out. The low temperature also means that deep sound channels would form in the deeper parts of the arctic ocean.
Like bandit mentioned, ice is highly reflective to sound, but its irregular contour would produce unpredictable bounces.
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