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首页> 外文期刊>Acta Meteorologica Sinica >DYNAMIC STUDY ON INFLUENCE OF INERTIAL GRAVITY WAVES INDUCED BY UNBALANCED FLOW ON MEIYU FRONT HEAVY RAIN
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DYNAMIC STUDY ON INFLUENCE OF INERTIAL GRAVITY WAVES INDUCED BY UNBALANCED FLOW ON MEIYU FRONT HEAVY RAIN

机译：动平衡流引起的重力重力对梅雨前大雨影响的动力学研究

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摘要

The Meiyu front heavy rain process in 1 — 3 June 2000 is numerically simulated in this paper, and results are then analyzed to show the effects of geostrophic balance collapse, unbalanced flow occurrence, low level jet (LLJ) development, and gravity waves genesis and propagation on the rainstorm. Analyses indicate that the sudden northwest movement of subtropical high may destruct the local geostrophic balance, leading to an increase in the local pressure gradient and the occurrence of ageostrophic flow, and meanwhile the adjustment of circulation starts to build a new balance. During the process, an LLJ and gravity waves appear correspondingly. The dispersion of unbalanced energy through the divergence/convergence of the geostrophic departure winds, promotes the propagation of strong wind cores along the LLJ, and the dispersion direction is influenced by the steering flow and the moisture concentration area. The development of LLJ is one of important conditions, which induces the heavy rain especially in the left front part of the jet where the convergence and shear of winds occur. It is also found that the genesis of disturbance, meso-vortex, and meso-convective system provides a favorable condition for the rainstorm. The above results are clearly illustrated by the high spatial and temporal resolution simulation data from a mesoscale numerical model.
机译：本文对2000年6月1日至3日的梅雨锋暴雨过程进行了数值模拟，然后对结果进行了分析，以显示地转平衡崩溃，不平衡流动发生，低空急流（LLJ）发育以及重力波的产生和影响。在暴雨中传播。分析表明，副热带高压向西北的突然运动可能破坏局部地转平衡，导致局部压力梯度增大和变质流的发生，同时环流的调整开始建立新的平衡。在此过程中，LLJ和重力波会相应出现。通过地转离去风的发散/会聚分散不平衡的能量，促进了强风芯沿LLJ的传播，并且分散方向受转向流和水分集中区域的影响。低空急流的发展是重要条件之一，特别是在发生风的收敛和切变的喷气机左前部，引起大雨。还发现扰动，中涡和中对流系统的成因为暴雨提供了有利条件。来自中尺度数值模型的高空间和时间分辨率模拟数据清楚地说明了以上结果。

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