Particle system, unaffected by attached sprite

Hi all,

I have attached a particle system attached to a sprite to simulate bubbles.
The idea is that the bubble float upwards. I have got this working by setting gravity to -1.
However the particles are affected by the player they are attached to. When the player jumps, the bubbles jump. I want them to be unaffected.

Any ideas where I can set this?

In the particle system, change the Simulation Space from Local to World.