glidertools.physics.brunt_vaisala

glidertools.physics.brunt_vaisala(salt, temp, pres, lat=None)

Calculate the square of the buoyancy frequency.

This is a copy from GSW package, with the exception that the array maintains the same shape as the input. Note that it only works on ungridded data at the moment.

\[\]

N^{2} = frac{-g}{sigma_{theta}} frac{dsigma_{theta}}{dz}

Parameters:

  • SA (array-like) – Absolute Salinity, g/kg

  • CT (array-like) – Conservative Temperature (ITS-90), degrees C

  • p (array-like) – Sea pressure (absolute pressure minus 10.1325 dbar), dbar

  • lat (array-like, 1-D, optional) – Latitude, degrees.

  • axis (int, optional) – The dimension along which pressure increases.

Returns:

N2 – Buoyancy frequency-squared at pressure midpoints, 1/s. The shape along the pressure axis dimension is one less than that of the inputs.

Return type:

array