  A box model of the inter-hemispheric Atlantic meridional overturning
circulation is developed, including a variable pycnocline depth for the
tropical and subtropical regions. The circulation is forced by winds over a
periodic channel in the south and by freshwater forcing at the surface. The
model is aimed at investigating the ocean feedbacks related to perturbations in
freshwater forcing from the atmosphere, and to changes in freshwater transport
in the ocean. These feedbacks are closely connected with the stability
properties of the meridional overturning circulation, in particular in response
to freshwater perturbations.
