You could use the chunk ID as a case switcher, then have different turbulence nodes plugged into that, each with a different seed.
Another option might be to have different 'layers' in the turbulence by adding a value into the Turbulence Centre value based on the chunk ID. I've attached a picture which might
make sense. Basically I added two points at world zero - normally they'd produce the same turbulence value. However, by adding in a value based on their chunk 'layer', you can now get different results.