Sensitivity of High-Resolution Simulations of the Warm-Sector Rainstorm in Eastern Hubei to Planetary Boundary Layer Schemes

XU Jianyu

doi:10.7522/j.issn.1000-0534.2018.00003

2018 , Vol. 37 >Issue 5: 1313 - 1324

DOI: https://doi.org/10.7522/j.issn.1000-0534.2018.00003

Sensitivity of High-Resolution Simulations of the Warm-Sector Rainstorm in Eastern Hubei to Planetary Boundary Layer Schemes

XU Jianyu

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Hubei Key Laboratory for Heavy Rain Monitoring and Warning Research, Institute of Heavy Rain, China Meteorological Administration, Wuhan 430205, Hubei, China

Received date: 2017-09-15

Online published: 2018-10-28

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Abstract

A typical warm-sector rainstorm occurred in eastern Hubei during 5-6 July 2016, causing severe flooding and damage. This heavy rainfall event, associated with an unusual environment to trigger convection, happened on the edge of subtropical high. The Weather Research and Forecast (WRF) model is used to simulate this event in cloud-resolving resolution (3 km). Experiments are conducted to examine the sensitivity of the simulation to the use of three different planetary boundary layer schemes, including the asymmetric convective models like version 2 (ACM2), Yonsei University (YSU), and Mellor-Yamada-Janjic (MYJ) schemes. Numerical results show a significant sensitivity of the short-time heavy rainfall to planetary boundary layer schemes, with the YSU and MYJ schemes produce stronger rainstorm in the development stage of precipitation and weaker rainstorm in the extinction stage compared to the ACM2 scheme, which is mainly due to the earlier triggering and earlier extinction of the strong convection in the simulations with the YSU and MYJ schemes. Specifically, before convection triggering, the eddy diffusivity coefficients simulated by the YSU and MYJ schemes are much less than the ACM2 scheme, and the meridional wind tendencies due to planetary boundary layer processes are much weaker, so the deceleration of the low-level south wind is less, leading to the enhanced convergence of south wind and the earlier triggering of strong convection. While in the extinction stage of precipitation, convections simulated by the YSU and MYJ schemes disappear quickly, comparing with the new convections initiated continuously on the low level shear line which is more obvious in the simulation with the ACM2 scheme. Furthermore, a sensitivity test is carried out with the latent heating from the microphysical processes turned off during the extinction stage of precipitation, which shows that the generation of the low level shear line is mainly due to the regulation of the mesoscale environment by the latent heat release from precipitation in the development stage, while the effect of planetary boundary layer processes is relatively small. On the other hand, detailed analysis of the impact of planetary boundary layer schemes on cloud microphysics and resulting precipitation shows that, the formation of the short-time heavy rainfall is related to the dominant role played by the melting graupel in the cold-cloud precipitation. Compared to the ACM2 scheme, simulations with the YSU and MYJ schemes produce more graupel in the development stage of precipitation and less graupel in the extinction stage, which is corresponding to the characteristics of the short-time heavy rainfall.

Key words： Warm-sector rainstor; high-resolution simu; planetary boundary l

Cite this article

XU Jianyu . Sensitivity of High-Resolution Simulations of the Warm-Sector Rainstorm in Eastern Hubei to Planetary Boundary Layer Schemes[J]. Plateau Meteorology, 2018 , 37(5) : 1313 -1324 . DOI: 10.7522/j.issn.1000-0534.2018.00003

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