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The M/V Cory Chouest departed Fremantle, Australia for Heard Island on January 9, 1991, arriving on
21 January 1991. Along the way the sea surface temperature dropped from 20°C to 4°C, falling
particularly rapidly as the Antarctic Circumploar Current was crossed. The sea surface temperature
shown in this figure is from a state estimate using a high-resolution ocean model ("ECCO2"). At the
high southerly latitude of Heard Island, the sound channel axis is near the surface, so the acoustic
source can more easily be placed within it.
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