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- W3097369878 abstract "Abstract. A tilted polarization lidar (TPL) with a pointing angle of 30° off zenith has been developed for continuous monitoring of the atmosphere with 10-s time and 6.5-m height resolution. From lidar-derived aerosol backscatter, instantaneous ABL depths are retrieved by logarithm gradient method (LGM) and Harr wavelet transform method (HWT), while hourly-mean ABL depths by variance method. A new FWHM method utilizing the full width at half maximum (FWHM) of the variance profile of aerosol backscatter ratio (ABR) fluctuations is proposed to determine the entrainment zone thickness (EZT). Both typical winter and summer clear-day observational cases are presented. It is concluded the convective boundary layer (CBL) evolution can be described by four stages. At the formation stage, the hourly-mean CBL depth grew slowly with a positive growth rate of 0.3 km/h. At the quasi-stationary stage, the hourly-mean CBL depth varied little and the corresponding growth rate changed sign with absolute value of 150 m, while the latter had respective percentages of 2.0 % and 31 % of EZT falling into the same corresponding subranges. Common statistical characteristics also existed for both cases. The growth stage always had the largest mean and stddev of EZT and the quasi-stationary stage usually the smallest stddev of EZT. For all four stages, most EZT values fell into the 50–150 m subrange; the overall percentages of EZT falling into the 50–150 m subrange between 0900 and 1900 LT were 84 % and 67 % for the winter and summer cases, respectively." @default.
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- W3097369878 date "2020-10-26" @default.
- W3097369878 modified "2023-10-16" @default.
- W3097369878 title "Characteristics of convective boundary layer and associated entrainment zone as observed by a ground-based polarization lidar" @default.
- W3097369878 doi "https://doi.org/10.5194/acp-2020-963" @default.
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