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Impacts of boundary layer parameterization schemes and air-sea coupling on WRF simulation of the East Asian summer monsoon

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Science China Earth Sciences 2014年第3期57卷 1480-1493页

作者： WANG ZiQian DUAN AnMin WU GuoXiong State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of Sciences Key Laboratory for Land Surface Process and Climate Change in Cold and Arid Regions Chinese Academy of Sciences University of Chinese Academy of Sciences

The planetary boundary layer （PBL） scheme in the regional climate model （RCM） has a significant impact on the interactions and exchanges of moisture, momentum, and energy between land, ocean, and atmosphere; however, its uncertainty will cause large systematic biases of RCM. Based on the four different PBL schemes （YSU, ACM2, Boulac, and MYJ） in Weather Research and Forecasting （WRF） model, the impacts of these schemes on the simulation of circulation and precipitation during the East Asian summer monsoon （EASM） are investigated. The simulated results of the two local turbulent kinetic energy （TKE） schemes, Boulac and MYJ, are more consistent with the observations than those in the two nonlocal closure schemes, YSU and ACM2. The former simulate more reasonable low-level southwesterly flow over East China and west pacific subtropical high （WPSH） than the latter. As to the modeling of summer monsoon precipitation, both the spatial distributions and temporal evolutions from Boulac and MTT are also better than those in YSU and ACM2 schemes. In addition, through the comparison between YSU and Boulac experiments, the differences from the results of EASM simulation are more obvious over the oceanic area. In the experiments with the nonlocal schemes YSU and ACM2, the boundary layer mixing processes are much stronger, which lead to produce more sea surface latent heat flux and enhanced convection, and finally induce the overestimated precipitation and corresponding deviation of monsoon circulation. With the further study, it is found that the absence of air-sea interaction in WRF may amplify the biases caused by PBL scheme over the ocean. Consequently, there is a reduced latent heat flux over the sea surface and even more reasonable EASM simulation, if an ocean model coupled into WRF.

关键词： WRF model boundary layer parameterization scheme East Asian summer monsoon air-sea coupling

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Numerical Experiments of Three boundary layer parameterization schemes on Simulation Results of Low-vortex Rainstorm Weather in Langfang Region

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Meteorological and Environmental Research 2021年第1期12卷 59-62页

作者： Min PENG Qingchuan WANG Wenxia YANG Yaqing HONG Pengju JIN Gu an Meteorological Bureau of Hebei Province Gu an 065500China Langfang Meteorological Bureau of Hebei Province Langfang 065000China Hebei Weather Modification Office Shijiazhuang 050021China

Using mesoscale numerical model WRFV3.7,simulation tests of a low-vortex rainstorm were carried out in Langfang area,and simulation results of three boundary layer parameterization schemes(MYJ,YSU,ACM2)were *** results showed that the rainstorm in Langfang area had better dynamic *** the influence of northeast cold vortex,cold vortex at high altitude cooperated with the surface wind speed convergence,which provided better dynamic condition for strong convective *** boundary layer parameterization schemes all simulated surface wind speed convergence of rainstorm *** results of 24-h rainfall distribution showed that the simulation of YSU scheme was better than ACM2 and *** simulation results of flow field and temperature field also verified that YSU scheme was better than other schemes.

关键词： boundary layer parameterization scheme WRF model Low-vortex rainstorm

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