My tests only showed that shallower layer means shallower shadow zone, as is to be expected. As for steepness, both my test showed very similar shadow zone shape, while the SSP profile was rather different. So I'd say there is no difference, but I did not test it properly. So I suggest you to test it. Oceanology gives new dimension to DW, and I don't have it even installed at the moment.
Btw. thermocline is border of two bodies of water with different temperatures. What can be steep is sound speed profile, or gradient of temperature, not thermocline.
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