The Thermally Driven “Super Vortex” over the Qingzang Plateau: Its Role in Triggering Cloud and Precipitation and Associated Global Effects

A thermally driven “Super Vortex” circulation often develops over the Qingzang Plateau (QZP; namely, the Qinghai–Xizang Plateau), which is characterized by cyclonic convergence in the lower troposphere and anticyclonic divergence in the upper troposphere, a structure dynamically analogous to the conditional instability of the second kind (CISK) mechanism in tropical cyclones. Meanwhile, the latent heat released by cloud and precipitation also constitutes a primary component of the QZP’s thermal forcing, reinforcing a self-excited positive feedback that maintains this “Super Vortex” dynamic structure. South Asia–sourced aerosols are transported to the Mount Qomolangma (MQ) region, which are closely associated with the “Super Vortex” dynamic structure. These aerosols and the apparent heat source generate a pronounced cloud–precipitation activation effect, thereby enhancing deep convection over the complex terrain of the QZP. The strong buoyancy and shear terms in the QZP boundary layer, induced by inhomogeneous low-level air density over the large-scale terrain, also possess an “efficient” convection triggering capability. From a global perspective, the large-scale terrain boundary layers exhibit general universality in modulating the cloud and precipitation triggering processes. The warming–wetting trend over the QZP and its associated convective activity are closely associated with atmospheric moisture cycling and energy transport arising from trans-hemispheric air–sea interactions. Sea surface temperatures (SSTs) in key oceanic regions of both hemispheres exhibit coherent interdecadal variability with that of low cloud cover (LCC) over the QZP. Furthermore, Rossby wave sources triggered by SST variations over these regions exert non-negligible impacts on the upper-tropospheric circulation of the “Super Vortex” dynamic structure and its convective activity. Deep convective systems that frequently occur over the QZP further enhance the vertical transport efficiency through the “chimney effect”, rapidly conveying energy and moisture into the mid- and upper troposphere. In doing so, they constitute a critical component of the global atmospheric energy and moisture cycles, highlighting the global influence of the QZP “Super Vortex” dynamic structure on atmospheric moisture cycling and climate variability.