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首页> 外文学位 >Fine-scale radar observations of orographic precipitation features during a Wasatch Mountain winter storm.
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Fine-scale radar observations of orographic precipitation features during a Wasatch Mountain winter storm.

机译：沃萨奇山冬季风暴期间地形降水特征的精细雷达观测。

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摘要

Fine-scale spatiotemporal variations in orographic precipitation pose a major challenge for weather prediction in mountainous regions. Here we use ground-based X-band radar observations collected during IOP6 of the Storm Chasing Utah Style Study (SCHUSS) to provide an illustrative example of such variations during a cold-frontal passage over the Wasatch Mountains of northern Utah. Emphasis is placed on precipitation features in and around Little Cottonwood Canyon (LCC), which cuts orthogonally eastward into the Wasatch Mountains. This work also demonstrates the potential for improving weather analysis and forecasting of such variations in LCC using a gap-filling radar.;Precipitation during the weakly stratified prefrontal storm stage of IOP6 featured a wave-like barrier-scale reflectivity maximum along the Wasatch Crest that extended weakly westward and upstream over the transverse ridges flanking LCC. These characteristics appeared to reflect a veering wind profile, which produced southwesterly flow over the ridges flanking LCC but cross-barrier westerly flow further aloft. Sublimation within dry subcloud air further diminished radar reflectivities over lower LCC. The cold front was associated with stronger reflectivities over lower LCC and at lower-to-mid elevations along the northwest-facing canyon wall, consistent with shallow, northwesterly upslope flow. Eventually, shallow precipitating cells developed in the moist-neutral postfrontal flow, with the depth, coverage and intensity of these cells increasing from over the Salt Lake Valley to upper LCC.
机译：地形降水的精细时空变化对山区的天气预报提出了重大挑战。在这里，我们使用在暴风雨追逐犹他州风格研究（SCHUSS）的IOP6期间收集的地面X波段雷达观测结果，来提供犹他州北部Wasatch山脉冷锋经过期间此类变化的说明性示例。重点放在小杨木峡谷（LCC）内和周围的降水特征上，该峡谷垂直向东切入沃萨奇山。这项工作还展示了使用缝隙雷达改善LCC的这种天气变化的天气分析和预报的潜力。IOP6的弱分层前额风暴阶段的降水沿Wasatch波峰具有波状的栅栏反射率最大值，在LCC两侧的横向山脊上向西弱延伸至上游。这些特征似乎反映了一个偏向的风廓线，该风廓线在LCC两侧的山脊上产生了西南风，但在更高处横穿西风。干燥的亚云空气中的升华进一步降低了较低LCC上的雷达反射率。冷锋与较低的LCC以及沿西北向的峡谷壁的中低高度的反射率较强相关，这与西北偏高的浅流一致。最终，在中性的后额叶湿流中形成了浅层沉淀细胞，这些细胞的深度，覆盖范围和强度从盐湖谷到上层LCC都在增加。

著录项

  • 作者

    Campbell, Leah Suzanne.;

  • 作者单位

    The University of Utah.;

  • 授予单位 The University of Utah.;
  • 学科 Atmospheric Sciences.
  • 学位 M.S.
  • 年度 2013
  • 页码 69 p.
  • 总页数 69
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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