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Mixing-Height Time Series from Operational Ceilometer Aerosol-Layer Heights

机译：运行云高仪气溶胶层高度的混合高度时间序列

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摘要

A new method is described to derive mixing-height time series directly from aerosol-layer height data available from a Vaisala CL51 ceilometer. As complete as possible mixing-height time series are calculated by avoiding outliers, filling data gaps by linear interpolation, and smoothing. In addition, large aerosol-layer heights at night that can be interpreted as residual layers are not assigned as mixing heights. The resulting mixing-height time series, converted to an appropriate data format, can be used as input for dispersion calculations. Two case examples demonstrate in detail how the method works. The mixing heights calculated using ceilometer data are compared with values determined from radiosounding data at Vienna by applying the parcel, Heffter, and Richardson methods. The results of the parcel method, obtained from radiosonde profiles at noon, show the best fit to the ceilometer-derived mixing heights. For midnight radiosoundings, larger deviations between mixing heights from the ceilometer and those deduced from the potential temperature profiles of the soundings are found. We use data from two Vaisala CL51 ceilometers, operating in the Vienna area at an urban and rural site, respectively, during an overlapping period of about 1 year. In addition to the case studies, the calculated mixing-height time series are also statistically evaluated and compared, demonstrating that the ceilometer-based mixing height follows an expected daily and seasonal course.
机译：描述了一种新方法，该方法可直接从Vaisala CL51云高仪获得的气溶胶层高度数据直接得出混合高度时间序列。通过避免离群值，通过线性插值填充数据间隙和平滑来尽可能完整地计算混合高度时间序列。此外，夜间的较大气溶胶层高度（可以解释为残留层）未分配为混合高度。所得的混合高度时间序列已转换为适当的数据格式，可用作色散计算的输入。两个案例详细说明了该方法的工作原理。通过应用包裹，Heffter和Richardson方法，将使用云高仪数据计算出的混合高度与根据维也纳的无线电数据确定的值进行比较。从中午无线电探空仪剖面获得的包裹方法的结果显示出与高空仪得出的混合高度的最佳拟合。对于午夜的无线电测深，发现云高仪的混合高度与从测深的潜在温度曲线推导出的高度之间存在较大的偏差。我们使用来自两台维萨拉CL51云高仪的数据，分别在维也纳地区的城市和农村站点运行，大约重叠了一年。除了案例研究，还对统计的混合高度时间序列进行统计评估和比较，表明基于云高仪的混合高度遵循预期的每日和季节性过程。

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