pvtend.ddy

pvtend.ddy(field: ndarray, dy: float) → ndarray

Meridional derivative ∂f/∂y with one-sided differences at boundaries.

Uses centred differences in the interior and forward/backward differences at the first/last latitude row.

Parameters:

• field – 2-D (nlat, nlon) or 3-D (nlev, nlat, nlon).

• dy – Meridional grid spacing [m].

Returns:

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