The influence of latent heating and its feedback effect on a Qinghai-Tibetan Plateau vortex occurring on 29 July 2009 was examined by using the WRF model in this study. Two experiments were conducted. In the control experiment, all physical processes were retained. In the sensitivity experiment, latent heat released by large-scale and cumulus convective precipitation was removed, while other physical processes were kept. By comparing model results and reanalysis data, it is found that the model can simulate the vortex moving path, intensity and the vortex-induced precipitation well in the control experiment. Without taking the latent heating into account, the simulated vortex moves quite slowly and disappear in the middle of the plateau, with little precipitation. The comparison of these two numerical simulations demonstrates that there is a positive feedback mechanism between the latent heating and the convection. The latent heating leads to intensive convective activity, and the convection extends to the upper level, thus much latent heat releases to the atmosphere. The potential vortices diagnostic analysis shows that, in low level, positive potential vorticity (PV) tendency caused by the vertical gradient of latent heating is beneficial to the strengthening and migrating of the plateau vortex. The PV tendency generated by vertical flux divergence term is contrary to that caused by vertical gradient of latent heating. In the development period of plateau vortex, because of the positive feedback mechanism between the latent heating and the convection, the positive PV tendency generated by the vertical gradient of latent heating increases rapidly, and the latent heating plays a leading role in the PV change at low levels. When the vortex develops into mature period, the contribution of latent heating decreases and divergence terms play important roles.
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