  The solar wind is found by Parker Solar Probe (PSP) to be abundant with
Alfv\'enic velocity spikes and magnetic field kinks. Temperature enhancement is
another remarkable feature associated with the Alfv\'enic spikes. How the
prototype of these coincident phenomena is generated intermittently in the
source region becomes a hot topic of wide concerns. Here we propose a new model
introducing guide-field discontinuity into the interchange magnetic
reconnection between open funnels and closed loops with different magnetic
helicities. The modified interchange reconnection model not only can accelerate
jet flows from the newly opening closed loop but also excite and launch
Alfv\'enic wave pulses along the newly-reconnected and post-reconnected open
flux tubes. We find that the modeling results can reproduce the following
observational features: (1) Alfv\'en disturbance is pulsive in time and
asymmetric in space; (2) Alfv\'enic pulse is compressible with temperature
enhancement and density variation inside the pulse. We point out that three
physical processes co-happening with Alfv\'en wave propagation can be
responsible for the temperature enhancement: (a) convection of heated jet flow
plasmas (decrease in density), (b) propagation of compressed slow-mode waves
(increase in density), and (c) conduction of heat flux (weak change in
density). We also suggest that the radial nonlinear evolution of the Alfv\'enic
pulses should be taken into account to explain the formation of magnetic
switchback geometry.
