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beta: $\beta\ge 0$

Expansivity of salt. This is used in the gravity term on the right hand side of the Navier-Stokes equations in the form

-g\beta\left(s-s_0\right) ,

where $s(x,y,z,t)$ is the salinity and $s_0(z)$ is the initial salinity. If $\beta=0$ advection of salinity is not computed.