The Frontal Hydraulic Head: A Micro-α Scale (̃1 km) Triggering Mechanism for Mesoconvective Weather Systems

The Frontal Hydraulic Head: A Micro-α Scale (̃1 km) Triggering Mechanism for Mesoconvective Weather Systems
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锋面液压头:中对流天气系统的微α尺度(̃1公里)触发机制

DOI:
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发表时间:
1985
期刊:
影响因子:
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通讯作者:
F. Mosher
F. Mosher
中科院分区:
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文献类型:
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作者:
M. Shapiro;T. Hampel;Doris A. Rotzoll;F. Mosher

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美国国家海洋和大气管理局博尔德大气观测站(BAO)300米高的观测塔、美国国家大气研究中心(NCAR)的Sabreliner飞机和美国国家海洋和大气管理局GOES-5卫星的测量结果表明,非降水性地面冷锋区在水平距离小于等于100公里时,其锋面尺度的崩溃是有根据的。这些霜冻的前缘具有密度流的特征结构:一个升高的水头,然后是湍流尾流。在300米(AGL)处,前头部的垂直运动超过5 m s-1。锋面头部的上升可能是潜在不稳定释放和强烈的飑线中对流形成的触发机制。
Abstract Measurements from the NOAA Boulder Atmospheric Observatory (BAO) 300 m tower, the National Center for Atmospheric Research (NCAR) Sabreliner aircraft, and the NOAA GOES-5 satellite, give evidence for the cross-front scale collapse of nonprecipitating surface cold-frontal zones to horizontal distances of ∼1 km or less. The leading edges of these frosts possess the characteristic structure of density current flows: an elevated hydraulic head followed by a turbulent wake. Vertical motions at the frontal heads exceed 5 m s−1 at 300 m (AGL). The ascent at the frontal head may act as a (∼1 km-scale) triggering mechanism for the release of potential instability and the formation of intense squall-line mesoconvection.