Observational Research on Planetary Boundary Layer by Lidar Over Nanjing City
Observational Research on Planetary Boundary Layer by Lidar Over Nanjing City
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发表时间：
2014
影响因子：
11.4
通讯作者：
J. Ji
中科院分区：
文献类型：
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作者：
J. Ji
为了研究南京地区行星边界层的结构特征，利用2010年11月至2011年10月的Mie散射激光雷达观测资料，采用小波协方差方法反演了南京地区行星边界层的高度。分析了边界层高度的日变化和季节变化特征，并讨论了气象条件对边界层高度的影响。结果表明，南京地区存在典型的日变化，夜间低值小于0.5km，白天高值大于1km，最大混合层高度春季最高1.77km，冬季最低1.34km。PBL发展高度（最大混合层高度）与地面温度呈显著正相关，与地面相对湿度呈显著负相关。云能有效地降低最大混合层高度，缩短到达最大混合层高度的时间。
In order to study the structural feature of the planetary boundary layer(PBL)over Nanjing City,the height of PBL was inverted by using wavelet covariance method,based on one year's measurements of atmospheric scattering properties by a Mie-scatter Lidar from Nov. 2010 to Oct. 2011. The characteristics of diurnal cycle and seasonal variations of the height of PBL were analyzed and then the influence induced by meteorological conditions was discussed. Results showed that the typical diurnal cycles were found in Nanjing area with low values less than 0.5 km at night and high values greater than lkm at daytime respectively;the maximum mixing layer height has a highest value l.77 km in spring and a lowest value 1.34 km in winter. A significantly positive relationship between the height of PBL development(maximum mixing layer height) and the surface temperature was found,while a significantly negative relationship with the surface relative humidity was obtained. Clouds can reduce the maximum mixing layer height effectively and reduce the time to get to the maximum mixing layer height.