Investigation of PBL schemes combining the WRF model simulations with scanning water vapor differential absorption lidar measurements
Investigation of PBL schemes combining the WRF model simulations with scanning water vapor differential absorption lidar measurements
复制标题
DOI：
10.1002/2015jd023927
复制
发表时间：
2016-01
期刊：
影响因子：
--
通讯作者：
J. Milovac;K. Warrach‐Sagi;A. Behrendt;F. Späth;J. Ingwersen;V. Wulfmeyer
中科院分区：
文献类型：
--
作者：
J. Milovac;K. Warrach‐Sagi;A. Behrendt;F. Späth;J. Ingwersen;V. Wulfmeyer
在德国西部晴空天气条件下的案例研究中，对行星边界层（PBL）方案和陆地表面模型（LSM）不同的天气研究和预报（WRF）模型进行了六次模拟。模拟以 2 km 分辨率进行，采用两个局部和两个非局部 PBL 方案，并结合两个 LSM（NOAH 和 NOAH-MP）。由此产生的对流边界层（CBL）特征与实验区域的高分辨率水蒸气差分吸收激光雷达测量相结合进行研究。此外，利用混合图方法对模拟的土壤-植被-大气反馈过程进行量化。调查表明，非局部 PBL 方案比局部方案模拟了更深、更干燥的 CBL。此外，不同LSM的应用表明，干燥空气的夹带取决于地表的能量分配。研究表明，发生在陆地表面的过程的影响并不局限于 CBL 下部，而是延伸至界面层和对流层下部。关于 LSM 的选择，模拟湿度剖面日变化的差异在界面层比靠近陆地表面更显着。这表明地表过程的表示对 CBL 内混合特性的模拟具有重大影响。
Six simulations with the Weather Research and Forecasting (WRF) model differing in planetary boundary layer (PBL) schemes and land surface models (LSMs) are investigated in a case study in western Germany during clear‐sky weather conditions. The simulations were performed at 2 km resolution with two local and two nonlocal PBL schemes, combined with two LSMs (NOAH and NOAH‐MP). Resulting convective boundary layer (CBL) features are investigated in combination with high‐resolution water vapor differential absorption lidar measurements at an experimental area. Further, the simulated soil‐vegetation‐atmosphere feedback processes are quantified applying a mixing diagram approach. The investigation shows that the nonlocal PBL schemes simulate a deeper and drier CBL than the local schemes. Furthermore, the application of different LSMs reveals that the entrainment of dry air depends on the energy partitioning at the land surface. The study demonstrates that the impact of processes occurring at the land surface is not constrained to the lower CBL but extends up to the interfacial layer and the lower troposphere. With respect to the choice of the LSM, the discrepancies in simulating a diurnal change of the humidity profiles are even more significant at the interfacial layer than close to the land surface. This indicates that the representation of land surface processes has a significant impact on the simulation of mixing properties within the CBL.