Comparison of aerosol LIDAR retrieval methods for boundary layer height detection using ceilometer backscatter data
Comparison of aerosol LIDAR retrieval methods for boundary layer height detection using ceilometer backscatter data
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DOI：
10.5194/amt-2016-340
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
V. Caicedo;B. Rappenglueck;B. Lefer;G. Morris;D. Toledo;R. Delgado
中科院分区：
文献类型：
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作者：
V. Caicedo;B. Rappenglueck;B. Lefer;G. Morris;D. Toledo;R. Delgado
评估了三种估算边界层高度的算法：气溶胶梯度法、聚类分析法和Haar小波法。使用40多个日间无线电探空仪剖面来比较由Vaisala CL31 ceilometer获取的气溶胶后向散射边界层高度。在所有方法中，无线电探空仪和气溶胶导出的边界层高度大体上一致。聚类方法对ceilometer信号和悬浮气溶胶层中的噪声特别敏感（48.8%），而梯度方法在5种低气溶胶后向散射条件下表现出局限性。Haar小波方法被证明是最稳健的，但由于从气溶胶后向散射浓度得出BLH的基本假设而不是算法本身的错误，它只显示出局限性（占所有观测值的22.5%）。在所有方法中都可以看到，热力学和气溶胶导出的边界层高度与用于估计这些高度的方法之间存在分歧。
Three algorithms for estimating the boundary layer heights are assessed: an aerosol gradient method, a cluster analysis method, and a Haar wavelet method. Over 40 daytime radiosonde profiles are used to compare aerosol backscatter boundary layer heights retrieved by a Vaisala CL31 ceilometer. Overall good agreement between radiosonde and aerosol derived boundary layer heights was found for all methods. The cluster method was found to be particularly sensitive to noise in ceilometer signals and lofted aerosol layers (48.8% of comparisons), while the gradient method showed limitations in 5 low aerosol backscatter conditions. The Haar Wavelet method demonstrating to be the most robust only showing limitations (22.5% of all observations) due to the basic assumptions used to derive BLH from aerosol backscatter concentrations rather than errors with the algorithm itself. Disagreement between thermodynamically and aerosol derived boundary layer heights and the methodology used to estimate these heights was seen with all methods.