An Observational Study of a Mesoscale Area of Convection under Weak Synoptic-Scale Forcing
An Observational Study of a Mesoscale Area of Convection under Weak Synoptic-Scale Forcing
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弱天气尺度强迫下中尺度对流区域的观测研究
DOI：
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发表时间：
1985
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影响因子：
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通讯作者：
H. Bluestein
中科院分区：
文献类型：
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作者：
H. Bluestein
摘要：这是一个中尺度对流区域的案例研究，该对流区域于 1982 年 9 月 2 日夜间在堪萨斯州西部上空开始，一直持续到 9 月 3 日下午。对地面、高空、雷达和卫星观测的分析证据表明，雷暴可能是由于条件不稳定层升高而形成的。这种抬升可以定性地归因于由接近 60 kPa 的浅层暖平流引起的准地转上升运动。两个可能的水分来源是中层水分，它在上游山脊周围平流输送，以及来自下方的水蒸气湍流输送的局部区域。仅通过天气尺度的强制性分析无法预测对流事件；即使通过其他层面的详细分析也很难解释。
Abstract This is a case study of a mesoscale area of convection which began at night over western Kansas on 2 September 1982 and lasted until the afternoon of 3 September. Evidence from analyses of surface, upper-air, radar, and satellite observations suggests that the thunderstorms probably formed in response to the lifting of an elevated layer of conditional instability. The lifting can be attributed qualitatively to quasi-geostrophic ascending motion resulting from a shallow layer of warm advection near 60 kPa. Two possible sources of moisture were midlevel moisture which had been advected around an upstream ridge and a localized area of turbulent transport of water vapor from below. The convective event could not have been forecast with synoptic-scale, mandatory-level analyses alone; it was difficult to explain even with detailed analyses at other levels.