Observations of Mountain Wave–Induced Precipitation Shadows over Northeast Pennsylvania
Observations of Mountain Wave–Induced Precipitation Shadows over Northeast Pennsylvania
复制标题
宾夕法尼亚州东北部山波诱发降水阴影的观测
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
Jeff S. Waldstreicher
中科院分区：
文献类型：
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作者：
Raymond H. Brady;Jeff S. Waldstreicher
本文介绍了在宾夕法尼亚州东北部怀俄明州山谷附近观测到的两个山浪降水阴影的WSR-88 D资料。这些山波发展在类似的天气环境，具有强大的南到东南低空急流，一个稳定的层位于山顶附近的水平，和跨障碍流，随着高度的下降。一个事件与一个定义明确的，单一的降水阴影，而第二个事件显示多个降水阴影。这两种情况下的温度和风切变的垂直分布的细微差异似乎有助于确定山波及其相关的降水阴影显示的结构类型。这是支持的计算弗劳德数，Brunt-Vaisala频率，Scorer参数，和水平波长的两个事件。这些山波似乎有一个显着的影响，当地的降水分布和附近的人口稠密的…
Abstract WSR-88D depictions of two mountain wave–induced precipitation shadows observed near the Wyoming Valley of northeast Pennsylvania are presented. These mountain waves developed in similar synoptic environments that featured a strong south to southeast low-level jet, a stable layer situated near mountaintop level, and cross-barrier flow that decreased with height. One event was associated with a well-defined, singular precipitation shadow, while the second event displayed multiple precipitation shadows. Subtle differences in the vertical distribution of temperature and wind shear between the two cases appeared to be instrumental in defining what type of structure the mountain wave and their associated precipitation shadows displayed. This is supported by calculations of Froude number, Brunt–Vaisala frequency, Scorer parameter, and horizontal wavelength for the two events. These mountain waves appear to have a significant effect on the local precipitation distribution in and near the heavily populate...