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Observations of the afternoon transition of the convective boundary layer

机译:对流边界层下午过渡的观测

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This manuscript uses 915-MHz wind profiler reflectivity and Doppler spectral width data in time versus altitude to characterize general behaviors of the ending of the daytime convective boundary layer. From a wide variety of observed patterns, two categories are identified: inversion layer separation (ILS) and descent. Several possible causes for the different shapes of the patterns are discussed. Results show the descent cases occur on relatively warm and moist days with weak turbulence and a weakcapping inversion and ILS days occur on cooler and drier days with stronger turbulence and a stronger temperature capping inversion. The time at which the transition begins is also investigated and is found to be variable, sometimes beginning several hours before sunset.
机译:该手稿使用915 MHz风廓线仪反射率和多普勒频谱宽度数据随时间随高度变化来表征白天对流边界层结束的一般行为。从各种观察到的模式中,可以识别出两种类别:反转层分离(ILS)和下降。讨论了图案不同形状的几种可能原因。结果表明,下降的情况发生在相对温暖和潮湿的日子里,湍流较弱,且封顶反演较弱; ILS发生的日子较凉爽和干燥的日子里,湍流较强烈,温度上限反演更强。还研究了过渡开始的时间,发现该时间是可变的,有时开始于日落前几个小时。

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