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首页> 外文期刊>Atmospheric Chemistry and Physics Discussions >Analyzing the turbulent planetary boundary layer by remote sensing systems: the Doppler wind lidar, aerosol elastic lidar and microwave radiometer
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Analyzing the turbulent planetary boundary layer by remote sensing systems: the Doppler wind lidar, aerosol elastic lidar and microwave radiometer

机译：通过遥感系统分析湍流的行星边界层：多普勒风激光雷达，气溶胶弹性激光雷达和微波辐射计

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The planetary boundary layer (PBL) is the lowermost region of troposphere and is endowed with turbulent characteristics, which can have mechanical and/or thermodynamic origins. This behavior gives this layer great importance, mainly in studies about pollutant dispersion and weather forecasting. However, the instruments usually applied in studies of turbulence in the PBL have limitations in spatial resolution (anemometer towers) or temporal resolution (instrumentation aboard an aircraft). Ground-based remote sensing, both active and passive, offers an alternative for studying the PBL. In this study we show the capabilities of combining different remote sensing systems (microwave radiometer – MWR, Doppler lidar – DL – and elastic lidar – EL) for retrieving a detailed picture on the PBL turbulent features. The statistical moments of the high frequency distributions of the vertical wind velocity, derived from DL, and of the backscattered coefficient, derived from EL, are corrected by two methodologies, namely first lag correction and - 2 / 3 law correction. The corrected profiles, obtained from DL data, present small differences when compared with the uncorrected profiles, showing the low influence of noise and the viability of the proposed methodology. Concerning EL, in addition to analyzing the influence of noise, we explore the use of different wavelengths that usually include EL systems operated in extended networks, like the European Aerosol Research Lidar Network (EARLINET), Latin American Lidar Network (LALINET), NASA Micro-Pulse Lidar Network (MPLNET) or Skyradiometer Network (SKYNET). In this way we want to show the feasibility of extending the capability of existing monitoring networks without strong investments or changes in their measurements protocols. Two case studies were analyzed in detail, one corresponding to a well-defined PBL and another corresponding to a situation with presence of a Saharan dust lofted aerosol layer and clouds. In both cases we discuss results provided by the different instruments showing their complementarity and the precautions to be applied in the data interpretation. Our study shows that the use of EL at 532?nm requires a careful correction of the signal using the first lag time correction in order to get reliable turbulence information on the PBL.
机译：行星边界层（PBL）是对流层的最下部区域，具有湍流特征，可以具有机械和/或热力学起源。这种行为使这一层非常重要，主要是在有关污染物扩散和天气预报的研究中。但是，通常用于研究PBL湍流的仪器在空间分辨率（测速仪塔）或时间分辨率（在飞机上的仪器）上有局限性。主动和被动的地面遥感都为研究PBL提供了另一种选择。在这项研究中，我们展示了组合不同的遥感系统（微波辐射计– MWR，多普勒激光雷达– DL –和弹性激光雷达– EL）的功能，以获取有关PBL湍流特征的详细图片。从DL导出的垂直风速和从EL导出的后向散射系数的高频分布的统计矩通过两种方法进行校正，即第一次滞后校正和-2/3律校正。从DL数据获得的校正轮廓与未校正轮廓相比存在很小的差异，表明噪声的影响较小，并且所提出方法的可行性。关于EL，除了分析噪声的影响之外，我们还探索了不同波长的使用，这些波长通常包括在扩展网络中运行的EL系统，例如欧洲气溶胶研究激光雷达网络（EARLINET），拉丁美洲激光雷达网络（LALINET），NASA Micro -脉冲激光雷达网络（MPLNET）或天辐射仪网络（SKYNET）。通过这种方式，我们希望展示在不进行大量投资或更改其测量协议的情况下扩展现有监视网络功能的可行性。详细分析了两个案例研究，一个对应于定义明确的PBL，另一个对应于存在撒哈拉尘埃堆积的气溶胶层和云的情况。在这两种情况下，我们都讨论了不同仪器提供的结果，这些结果表明了它们的互补性以及在数据解释中应采取的预防措施。我们的研究表明，使用532？nm的EL时需要使用第一个滞后时间校正对信号进行仔细的校正，以便在PBL上获得可靠的湍流信息。

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