基于logistic曲线识别混合层高度的新方法

发布时间：2018-07-05 09:39

本文选题：Mie散射激光雷达 + 大气消光系数　；参考：《中国环境科学》2017年05期

【摘要】：基于成都市2013年6月至2014年2月Mie散射激光雷达探测数据的分析表明,混合层顶附近大气消光系数自下而上均存在显著下降区、整体缓变区以及二者之间的过渡区.利用logistic曲线对上述变化特征进行拟合,通过计算该曲线曲率最大值对应的高度,据此提出识别混合层高度的新方法.该方法的设计思想符合混合层的定义,即为湍流特征不连续界面以下湍流充分发展的气层;另外,相应的计算结果不仅和探空曲线得到的混合层高度总体一致,也与地面细颗粒物浓度的变化特征保持高度的相关.
[Abstract]:Based on the analysis of Mie scattering lidar data from June 2013 to February 2014 in Chengdu, it is shown that the atmospheric extinction coefficient near the top of the mixed layer has a significant descending region from bottom to top, a whole slowly changing region and a transition region between them. The logistic curve is used to fit the above characteristics, and the height corresponding to the maximum curvature of the curve is calculated, and a new method to identify the height of the mixed layer is proposed. The design idea of the method accords with the definition of mixed layer, that is, the gas layer with fully developed turbulence below the turbulent characteristic discontinuous interface, and the corresponding calculation results are not only consistent with the height of the mixed layer obtained by the sounding curve. It also has a high correlation with the change of ground fine particle concentration.
【作者单位】：成都信息工程大学大气科学学院;高原大气与环境四川省重点实验室;成都市环境监测中心站;
【基金】：国家自然科学基金重大研究计划(9164420061)
【分类号】：X51;X87

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