pvtend.ddp

pvtend.ddp(field: ndarray, plevs_pa: ndarray) → ndarray[source]

Pressure derivative ∂f/∂p for non-uniform levels.

Uses a three-point Lagrange stencil in the interior (second-order accurate on non-uniform grids, matching LOG20 d_dp.m) and one-sided differences at the top/bottom pressure boundaries.

Parameters:

field – Array with pressure as axis 0, shape (nlev, ...).
plevs_pa – Pressure levels in Pa, shape (nlev,).

Returns:

Same shape as field, in [field_units / Pa].