River runoff units

Variable sn_rnf (river runoff) in runoff.nc files has the unit kg/(m²s). How can I convert runoff from m³/s to kg/(m²s) ?

You assume that 1m³ of runoff weights 1000kg.
So 1 m³/s represents 1000kg on 1m² per s, i.e. 1 m³/s = 1000 kg/(m²s)

actually I think the runoff density is considered at rho0 = 1026kg/m3. I think…

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