doi:  10.3878/j.issn.1006-9895.1710.17173
激光雷达反演边界层高度方法评估及在北京的应用

Evaluation of the method for retrieving planetary boundary layer heights by lidar in Beijing and its application
摘要点击 360  全文点击 39  投稿时间:2017-05-25  修订日期:2017-10-13
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基金:  国家自然科学基金项目41405127,国家重点研发计划课题2016YFA0602001,北京市气象局科技计划项目BMBKJ201504006,北京市自然科学基金项目8164057
中文关键词:  边界层高度,小波协方差方法,激光雷达,飞机,探空
英文关键词:  PBL height, Wavelet covariance transform method, Lidar, Aircraft, Radiosonde
                    
作者中文名作者英文名单位
李霞LI Xia北京市人工影响天气办公室
权建农QUAN Jiannong中国气象局北京城市气象研究所
王飞WANG Fei北京市人工影响天气办公室
盛久江SHENG Jiujiang北京市人工影响天气办公室
高扬GAO Yang中国气象科学研究院中国气象局人工影响天气中心
赵德龙ZHAO Delong北京市人工影响天气办公室
程志刚Chen Zhigang中国气象局北京城市气象研究所
引用:李霞,权建农,王飞,盛久江,高扬,赵德龙,程志刚.2018.激光雷达反演边界层高度方法评估及在北京的应用[J].大气科学
Citation:LI Xia,QUAN Jiannong,WANG Fei,SHENG Jiujiang,GAO Yang,ZHAO Delong,Chen Zhigang.2018.Evaluation of the method for retrieving planetary boundary layer heights by lidar in Beijing and its application[J].Chinese Journal of Atmospheric Sciences (in Chinese)
中文摘要:
      边界层高度是影响大气边界层发展和空气污染程度的重要因子,是环境和气候研究的重要参数。本文利用激光雷达对北京地区2011年5月—2012年4月的边界层高度进行探测分析,采用小波协方差方法反演边界层高度,评估了方法的适用性。得到基于小波协方差方法自动判断边界层高度的最优参数组合,激光雷达与飞机探测结果对比一致性较好;与探空结果相关系数0.88,激光雷达反演的边界层高度略偏高。当激光雷达的垂直分辨率为30m时,更加适合北京地区的步长和阈值分别为210m和0.05;当激光雷达的垂直分辨率为15m时,步长和阈值分别为135m和0.05。分析期间,不同季节边界层高度日变化有明显的不同,夏季14:00左右达到最高,较高的边界层高度可维持3-4小时,平均可达1.30km;冬季较高边界层高度只能维持2小时左右,平均为1.08km。有云与无云天气边界层日变化特征以及边界层高度存在显著的差异,云的存在减少了到达地面的直接辐射,抑制了湍流的发展,进一步抑制了边界层的发展;本文也将激光雷达反演边界层高度结果应用于观测时期边界层高度与地面污染的关系研究中,统计得到边界层高度与PM2.5浓度的相关系数为-0.340。
Abstract:
      The planetary boundary layer (PBL) is an important parameter on discussion of environment and climate affects air pollution and the evolution in atmospheric boundary layer. We analyzed the height of PBL retrieved using wavelet covariance transform (WCT) method from Lidar backscatter profiles data from May 2011 to April 2012 and evaluated the method. PBL heights are validated using one radiosonde on the ground and instruments on aircraft in order to optimize the parameters required for lidar detection using the WCT method under different atmospheric conditions. The result shows the PBL heights have a better agreement between lidar and aircraft than between lidar and radiosonde with correlation coefficient of 0.88. Lidar appears to slightly overestimate PBL height. If the vertical resolution of lidar is 30m, the step length and threshold for Beijing area are 210m and 0.05, respectively; and the step length and threshold are 135m and 0.05, respectively, for the vertical resolution of lidar for 15m. PBL height shows a daily variation with average maximum value of 1.3km started from 14:00 and lasted three or four hours in summer, while the average maximum value of 1.08km lasted about two hours in winter. The result suggests that the direct radiation reaching the ground is reduced by cloud, which depresses the evolution of turbulence and PBL, and results in the low PBL height. We also apply the PBL height from lidar to the relational analysis between the concentration of PM2.5 and meteorological elements for the one-year period. The result shows that the correlation coefficient between PBL heights with the concentration of PM2.5 is -0.340.
主办单位:中国科学院大气物理研究所 单位地址:北京市9804信箱
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