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首页> 外文期刊>Natural Hazards >Time-height variation of winds and turbulence during typical tropical pre-monsoon thunderstorm events observed from high-resolution Doppler wind lidar measurements
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Time-height variation of winds and turbulence during typical tropical pre-monsoon thunderstorm events observed from high-resolution Doppler wind lidar measurements

机译：从高分辨率多普勒风光激光雷达测量中观察到典型的热带前季风雷暴事件中的风和湍流的时间高度变化

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摘要

High spatiotemporal resolution measurements of horizontal and vertical winds made using a Doppler wind lidar during development and mature stages of few typical tropical thunderstorm events in 2014 over a continental Indian station are used to study the dynamical changes that take place in the lower atmospheric layers close to surface. Results show significant time-height variability in horizontal wind especially 2-3 h before rainfall on ground. The recorded vertical motions on the thunderstorm days showed that during its developing stage, alternating updrafts and downdrafts are prevalent through the entire vertical column of the lower atmosphere with the magnitude of fluctuations being higher compared to those on non-thunderstorm days. Turbulence intensity is high in magnitude during the evolution of intense convection. Alternating layers of convergence and divergence with horizontally time-stratified layers of strong positive and negative wind shear are observed which seem to contribute to strengthening and vertical growth of local convection. Thus, high-resolution time-height variations in horizontal and vertical winds in the lower atmosphere during the life cycle of a tropical thunderstorm provide a better understanding of the atmospheric dynamics associated with it and short-duration heavy precipitation it produces.
机译：在开发期间使用多普勒风激光器的水平和垂直风的高速度和垂直风的测量和2014年少数典型的热带雷暴事件的成熟阶段，用于研究靠近较低的大气层发生的动态变化表面。结果在地面降雨之前显示出水平风中的显着时间高度差异，特别是2-3小时。雷暴天的记录的垂直运动表明，在其开发阶段，交替的上升流和下降过程通过较低气氛的整个垂直柱普遍存在与非雷暴天相比更高的波动幅度更高。激烈对流的演变过程中湍流强度呈高幅度。观察到与水平时间分层的强度和负风剪切层的交替的收敛层和发散，这似乎有助于加强局部对流的增强和垂直生长。因此，在热带雷暴的生命周期期间，水平和垂直风中的水平和垂直风的高分辨率和垂直风的变化提供了更好地了解与其相关的大气动力学和它产生的短持续沉淀。

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