一次干线对流下击暴流的研究
A Study of a Dryline Convective Downburst
摘要：
2005年6月15日下午，对流风暴沿科罗拉多州东部和新墨西哥州上空的干线及其以西发展。其中一场风暴向东进入俄克拉何马州的西马伦县，并在斯卡隆产生强烈下击暴流。干线，因为它向东跟踪俄克拉何马州西部狭长地带，建立了有利的条件，混合微暴流通过加强干线西部的垂直环流，因此，对流边界层（CBL）的深度。在对流开始之前，地球同步业务环境卫星（GOES）混合微下击暴流指数（HMI）和湿微下击暴流严重度指数（WMSI）产品表明，在俄克拉荷马州西部狭长地带的数值升高。此外，还将来自国家闪电探测网的闪电数据图像与雷达和卫星图像以及下击暴流的气象观测进行了比较。据观察，抑制云对地（CG）闪电率伴随着下击暴流发生与这场风暴。本文将研究导致下击暴流产生和相关的风暴电气化的环境因素。将强调使用地球静止业务环境卫星（GOES）湿微下击暴流严重性指数（WMSI）和混合微下击暴流指数（HMI）产品，以证明下击暴流潜力评估的有效性。雷达反射率和NLDN图像将描述对流形态和电气行为与这个干线对流风暴事件。
英文摘要：
During the afternoon of 15 June 2005, convective storms developed along and west of the dryline over eastern Colorado and New Mexico. One such storm tracked eastward into Cimarron County, Oklahoma and produced a strong downburst at Kenton. The dryline, as it tracked eastward over the western Oklahoma Panhandle, established favorable conditions for hybrid microbursts by enhancing vertical circulation west of the dryline and hence, the depth of the convective boundary layer (CBL). Prior to convective initiation, the Geostationary Operational Environmental Satellite (GOES) Hybrid Microburst Index (HMI) and Wet Microburst Severity Index (WMSI) products indicated elevated values over the western Oklahoma Panhandle. In addition, lightning data imagery, from the National Lightning Detection Network (NLDN), was compared to radar and satellite imagery and surface observations of downburst winds. It was observed that suppressed cloud-to-ground (CG) lightning flash rates accompanied downburst occurrence with this storm. This paper will examine the environmental factors that resulted in downburst generation and associated storm electrification. Use of the Geostationary Operational Environmental Satellite (GOES) Wet Microburst Severity Index (WMSI) and Hybrid Microburst Index (HMI) products will be highlighted to demonstrate effectiveness in the assessment of downburst potential. Radar reflectivity and NLDN imagery will be presented to describe convective morphology and electrical behavior with this dryline convective storm event.
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