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首页> 外文期刊>Atmosphere >Lidar and Ceilometer Observations and Comparisons of Atmospheric Cloud Structure at Nagqu of Tibetan Plateau in 2014 Summer
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Lidar and Ceilometer Observations and Comparisons of Atmospheric Cloud Structure at Nagqu of Tibetan Plateau in 2014 Summer

机译：2014年夏季青藏高原那曲地区激光雷达和云高仪观测及大气云结构比较

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In the project of the Third Tibetan Plateau Experiment of Atmospheric Science (TIPEX III), the intensive observation of cloud and precipitation in Nagqu was conducted from 1 July to 31 August 2014. The CL31 ceilometer and a WAter vapor, Cloud and Aerosol Lidar (WACAL) were deployed and focused on studying the cloud macroscopic characteristics and vertical distribution. The statistical result of CL31 ceilometer in continuous operation mode shows that the cloud occurrence is about 81% with a majority of simple one-layer cloud. The cloud base and top height are retrieved by improved differential zero-crossing method using lidar data. The results of cloud base height (CBH) are compared with CL31 ceilometer, showing a good consistency with each other, however, in some cases, the CL31 ceilometer overestimates the CBH and is also validated by synchronous radiosonde data. The time snippet comparisons of cloud property between CL31 ceilometer and lidar imply that the cloud properties have obvious diurnal variations with “U” shape distribution. The cloud development including the time-spatial distribution features also has distinct diurnal variations based on the lidar measurement. The detection range of lidar goes beyond the maximum height of CL31 ceilometer, offering substantial observations to the analysis of cirrus cloud radiation characteristics and formation mechanism.
机译：2014年7月1日至8月31日，在第三次青藏高原大气科学实验项目（TIPEX III）中，对那曲地区的云和降水进行了密集观测。CL31云高仪和WAter蒸气，云和气溶胶激光雷达（WACAL ）的部署，并专注于研究云的宏观特征和垂直分布。 CL31云高仪在连续运行模式下的统计结果表明，在大多数简单的单层云中，云的发生率约为81％。使用激光雷达数据，通过改进的差分过零方法检索云的底部和顶部高度。将云底高度（CBH）的结果与CL31云高仪进行了比较，显示出很好的一致性，但是，在某些情况下，CL31云高仪高估了CBH，并且也通过同步探空仪数据进行了验证。 CL31云高仪和激光雷达之间的云性能时间片段比较表明，云性能随“ U”形分布具有明显的昼夜变化。基于激光雷达测量，包括时空分布特征的云发展也具有明显的昼夜变化。激光雷达的探测范围超过了CL31云高仪的最大高度，为卷云辐射特征和形成机理的分析提供了实质性的观察。

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