  We study anomalous mesoscopic transport effects at the onset of the
superconducting transition focusing on the observed large Nernst-Ettinghausen
signal in disordered thin films. In the vicinity of the transition, as the
Ginzburg-Landau coherence length of preformed Cooper pairs diverges,
short-range mesoscopic fluctuations are equivalent to local fluctuations of the
critical temperature. As a result, the dynamical susceptibility function of
pair propagation acquires a singular mesoscopic component, and consequently,
superconducting correlations give rise to enhanced mesoscopic fluctuations of
thermodynamic and transport characteristics. In contrast to disordered normal
metals, the root-mean-square value of mesoscopic conductivity fluctuations
ceases to be universal and displays strong dependence on dimensionality,
temperature, and under certain conditions can exceed its quantum normal state
value by a large factor. Interestingly, we find different universality as
magnetic susceptibility, conductivity, and transverse magnetic thermopower
coefficients all display the same temperature dependence. Finally, we discuss
an enhancement of mesoscopic effects in the Seebeck thermoelectricity and Hall
conductivity fluctuations as mediated by emergent superconductivity.
