  We analyze the multifrequency behavior of the quasar 3C 454.3 during three
prominent \gamma-ray outbursts: 2009 Autumn, 2010 Spring, and 2010 Autumn. The
data reveal a repeating pattern, including a triple flare structure, in the
properties of each \gamma-ray outburst, which implies similar mechanism(s) and
location for all three events. The multi-frequency behavior indicates that the
lower frequency events are co-spatial with the \gamma-ray outbursts, although
the \gamma-ray emission varies on the shortest timescales. We determine that
the variability from UV to IR wavelengths during an outburst results from a
single synchrotron component whose properties do not change significantly over
the different outbursts. Despite a general increase in the degree of optical
linear polarization during an outburst, the polarization drops significantly at
the peak of the \gamma-ray event, which suggests that both shocks and turbulent
processes are involved. We detect two disturbances (knots) with superluminal
apparent speeds in the parsec-scale jet associated with the outbursts in 2009
Autumn and 2010 Autumn. The kinematic properties of the knots can explain the
difference in amplitudes of the \gamma-ray events, while their millimeter-wave
polarization is related to the optical polarization during the outbursts. We
interpret the multi-frequency behavior within models involving either a system
of standing conical shocks or magnetic reconnection events located in the
parsec-scale millimeter-wave core of the jet. We argue that \gamma-ray
outbursts with variability timescales as short as ~ 3 hr can occur on parsec
scales if flares take place in localized regions such as turbulent cells.
