  We study the mediation of supersymmetry breaking triggered by background
fluxes in Type II string compactifications with N=1 supersymmetry. The
mediation arises due to an U(1) vector multiplet coupling to both a hidden
supersymmetry breaking flux sector and a visible D-brane sector. The required
internal manifolds can be constructed by non-Kaehler resolutions of singular
Calabi-Yau manifolds. The effective action encoding the U(1) coupling is then
determined in terms of the global topological properties of the internal space.
We investigate suitable local geometries for the hidden and visible sector in
detail. This includes a systematic study of orientifold symmetries of del Pezzo
surfaces realized in compact geometries after geometric transition. We
construct compact examples admitting the key properties to realize flux
supersymmetry breaking and U(1) mediation. Their toric realization allows us to
analyze the geometry of curve classes and confirm the topological connection
between the hidden and visible sector.
