Seasonal and diurnal variability of planetary boundary height in Beijing: Intercomparison between MPL and WRF results
Seasonal and diurnal variability of planetary boundary height in Beijing: Intercomparison between MPL and WRF results
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北京行星边界高度的季节和日变化：MPL和WRF结果的对比
DOI：
10.1016/j.atmosres.2019.04.017
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发表时间：
2019-10-01
影响因子：
5.5
通讯作者：
Li, Jian
中科院分区：
文献类型：
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作者：
Chu, Yiqi;Li, Jing;Li, Jian
行星边界层（PBL）在能量交换和污染物扩散中发挥着重要作用。 PBL 的高度 (PBLH) 通常表现出明显的昼夜变化。在本研究中，我们基于微脉冲激光雷达（MPL）数据的一年观测，研究了中国北京的PBLH变化特征，并与天气研究和预报（WRF）模型使用八种不同方案模拟的PBLH进行了比较。使用k均值聚类技术将白天MPL PBLH的变化分为四种有代表性的类型。通过与 MPL 的比较，结果表明，Mellor-Yamada Nakanishi 和 Niino Level 3 (MYNN3) 方案（一种二阶闭合方案）在大多数情况下在表示 PBLH 变化方面表现最好。非局部方案在对流情况下也显示出优势，因为这些方案中嵌入了更强的垂直混合。进一步分析表明，PBLH定义的差异是造成不同方案之间差异的主要因素，而概况的偏差则起次要作用。
The Planetary boundary layer (PBL) plays an important role in energy exchange and pollutant dispersion. The height of the PBL (PBLH) usually exhibits distinct diurnal variation. In this study, we investigate the characteristics of PBLH variation of Beijing China based on 1-year observations from Micropulse LIDAR (MPL) data, and compared against the PBLH simulated by the Weather Research and Forecast (WRF) model using eight different schemes. The variation of daytime MPL PBLH has been classified into four representative types using k-means clustering technique. Through comparison against MPL, it is shown that the Mellor-Yamada Nakanishi and Niino Level 3 (MYNN3) scheme, a second-order closure scheme, performs the best in representing the PBLH variation in most of the cases. The non-local schemes also show advantages in convective situations, due to the stronger vertical mixing embedded in these schemes. Further analyses show that differences in PBLH definition is a major factor causing the divergence among different schemes, while the biases of the profiles play a minor role.