How to interpolation an argo data?

I'm work on an argo data consist of (cru,time,lon,lat,Prof{S,P,T}) and each S(salinity),T(temperature),P(pressure) is cell like below figure. Total numbeer is over 20000.

I want to interpolation salinity according to pressure so that I can make a isotherm plot. (1m)

Thank you for considering.

[KSSV]

If it is 2D data read about interp2. If a 1D data read about interp1.

[주희 박]

Thank you so much