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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Observations of the atmospheric boundary layer height under marine upstream flow conditions at a coastal site
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Observations of the atmospheric boundary layer height under marine upstream flow conditions at a coastal site

机译：沿海站点海洋上游流动条件下大气边界层高度的观测

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We investigate several lidar-type instruments and methodologies for boundary layer height (BLH) estimation during 2 days at a coastal site for winds that experience marine upstream flow conditions. Wavelet and profile fitting procedures on the aerosol backscatter signals from a ceilometer and an aerosol lidar reveal similar BLHs, but their agreement depends on the presence of clouds and the instrument signal, among others. BLHs derived by a threshold on the carrier-to-noise profiles of a wind lidar agree well with those derived by using a threshold on the backscatter profile of the ceilometer and are used as reference for a 10 day BLH intercomparison. Furthermore, the BLHs from the aerosol analysis are comparable to those derived from wind speed and direction profiles from combined mast/wind lidar measurements. The BLH derived from simulations performed with the Weather Research and Forecasting (WRF) model shows similar behavior compared to the lidar observations. The seasonal diurnal variation of the BLH for 2010, derived from the wind lidar and ceilometer thresholds, shows similar BLHs but generally higher values compared to that from WRF. No clear BLH diurnal variation is observed neither from the observations nor from the WRF model outputs, except in summer for the latter. Both observations and WRF model simulations reveal higher BLHs during autumn compared to spring time. These BLHs are used to evaluate the intra-annual variation and show high peaks in September, November, and February. Key Points Estimation of PBL height using several type of sensors and methodologiesSimilar PBL heights from instruments and WRF for 10 test cases/daysDiurnal and seasonal variations of PBL heights are similar from sensors and WRF
机译：我们调查了沿海地区2天中遇到海洋上游流动条件的风时，估计边界层高度（BLH）的几种激光雷达型仪器和方法。对来自云高仪和气溶胶激光雷达的气溶胶反向散射信号的小波和轮廓拟合程序显示出类似的BLH，但是它们的一致性取决于云和仪器信号等的存在。通过在激光雷达的载噪比轮廓上的阈值得出的BLH与通过在云高仪的反向散射轮廓上的阈值得出的BLH非常吻合，并用作10天BLH比较的参考。此外，通过气溶胶分析得到的BLH与通过组合的桅杆/激光雷达测量值从风速和风向得到的结果相当。由天气研究和预报（WRF）模型执行的模拟得出的BLH与激光雷达观测相比显示出相似的行为。从风雷达和云高仪阈值得出的2010年BLH的季节性昼夜变化显示相似的BLH，但与WRF相比，BLH值通常更高。无论是从观测结果还是从WRF模型的输出中，都没有观察到明显的BLH日变化，除了后者的夏季。观测和WRF模型模拟均表明，秋季的BLH比春季的高。这些BLH用于评估年内变化，并在9月，11月和2月显示高峰值。使用几种类型的传感器和方法估算PBL高度的关键点仪器和WRF在10个测试用例/天中获得的PBL高度相似传感器和WRF的PBL高度的昼夜变化与季节变化相似

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