  Search for the conjectured QCD critical point is one of the major scientific
goals for the Beam Energy Scan program at RHIC. The growth of the correlation
length is a universal feature for systems near criticality, and bulk viscosity
exhibits the strongest dependence on the correlation length. We investigate its
effects using a relativistic hydrodynamic model to find that rapidity
distributions of charged particles and net baryon number are visibly modified
if the fireball passes through the vicinity of the QCD critical point on the
phase diagram. We also discuss how critical modification of dilepton emission
rate may leave imprints on invariant mass spectra.
