Through a cloud-resolving simulation of the rapid intensification (RI) of Typhoon Meranti (2016), the convections, warm core, and heating budget are investigated during the process of RI. By investigating the spatial distributions and temporal evolutions of both convective-stratiform precipitation and shallow-deep convections, we find that the inner-core convections take mode turns, from stratiform-precipitation (SP) dominance to convective-precipitation (CP) prevalence during the transition stages between pre-RI and RI. For the CP, it experiences fewer convections before RI, and the conversion from moderate/ moderate-deep convections to moderate-deep/deep convections during RI. There is a clear upper-level warm-core structure during the process of RI. However, the mid-low-level warming begins first, before the RI of Meranti. By calculating the local potential temperature (θ) budget of various convections, the link between convections and the warm core (and further to RI via the pressure drop due to the warming core) is established. Also, the transport pathways of heating toward the center of Meranti driven by pressure are illuminated. The total hydrostatic pressure decline is determined by the mid-low-level warm anomaly before RI, mostly caused by SP. The azimuthal-mean diabatic heating is the largest heating source, the mean vertical heat advection controls the vertical downwards transport by adiabatic warming of compensating down-drafts above eye region, and then the radial θ advection term radially transports heat toward the center of Meranti in a slantwise direction. Accompanying the onset of RI, the heating efficiency of the upper-level warming core rises swiftly and overruns that of the mid-low-level warm anomaly, dominating the total pressure decrease and being mainly led by moderate-deep and deep convections. Aside from the characteristics in common with SP, for CP, the eddy component of radial advection also plays a positive role in warming the core, which enhances the centripetal transport effect and accelerates the RI of Meranti.

中文翻译：

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关于台风“梅兰蒂”的快速集约化（2016年）：对流，暖核和供暖预算

通过对台风梅兰蒂（2016）的快速增强（RI）的云解析模拟，研究了RI过程中的对流，暖芯和供热预算。通过研究对流-层状降水和浅深对流的空间分布和时间演变，我们发现内核对流呈模式转变，从层状降水（SP）优势向对流降水（CP）流行。前RI和RI之间的过渡阶段。对于CP，其在RI之前经历较少的对流，并且在RI期间从中等/中等深度对流转换为中等深度/深对流。在RI的过程中，有一个清晰的高层暖核结构。但是，中低层变暖首先开始于Meranti的RI。建立各种对流的θ预算，对流与暖芯之间的联系（以及由于暖芯引起的压降进一步到达RI）。而且，照亮了由压力驱动的朝向Meranti中心的加热传输路径。总静水压下降由RI之前的中低层暖异常决定，这主要是SP引起的。方位角平均非绝热加热是最大的热源，平均垂直热对流通过绝热变暖来控制垂直向下的传输，该加热是对眼部区域上方的向下补偿气流进行补偿，然后是径向θ对流项将热量沿倾斜方向朝Meranti的中心径向传输。伴随着RI的出现，上层暖芯的加热效率迅速上升，超过了中下层暖异常的加热效率，主导了总压力的下降，并且主要由中等深度和深对流引起。除了SP的共同特征外，对于CP，radial子对流的涡流成分在加热岩心方面也起着积极的作用，它增强了向心转运的作用并加速了Meranti的RI。