  We present a newly developed time-dependent three-dimensional multi-zone
hadronic blazar emission model. By coupling a Fokker-Planck based
lepto-hadronic particle evolution code 3DHad with a polarization-dependent
radiation transfer code, 3DPol, we are able to study the time-dependent
radiation and polarization signatures of a hadronic blazar model for the first
time. Our current code is limited to parameter regimes in which the hadronic
$\gamma$-ray output is dominated by proton synchrotron emission, neglecting
pion production. Our results demonstrate that the time-dependent flux and
polarization signatures are generally dominated by the relation between the
synchrotron cooling and the light crossing time scale, which is largely
independent of the exact model parameters. We find that unlike the low-energy
polarization signatures, which can vary rapidly in time, the high-energy
polarization signatures appear stable. As a result, future high-energy
polarimeters may be able to distinguish such signatures from the lower and more
rapidly variable polarization signatures expected in leptonic models.
