TY - JOUR
T1 - Numerical study on the effect of rainwater evaporation on severe convective weather under different boundary layer parameterization schemes
AU - Tang Jie and Liu Xiaoli
JO - Journal of Information and Computing Science
VL - 3
SP - 229
EP - 240
PY - 2024
DA - 2024/01
SN - 13
DO - http://doi.org/
UR - https://global-sci.org/intro/article_detail/jics/22449.html
KW -  mesoscale numerical model, boundary layer parameterization scheme 

AB - Tang Jie, Liu Xiaoli 
Nanjing University of Information Science and Technology, Key Laboratory of aerosol and cloud precipitation in China 
Meteorological Administration, Nanjing, Jiangsu 210044 
(Received January 07 2018, accepted May 25 2018) 
Abstract Three boundary layer parameterization schemes (MRF,UW,YSU) in mesoscale numerical model (WRF) are used to 
simulate a severe convective weather in Zhejiang on November 9, 2009 without considering the rainwater evaporation term and 
considering  the  rainwater  evaporation  term.  The  numerical  simulation  results  of  macroscopic  and  microscopic  physical 
mechanisms of strong  convection  were compared. The  results  show that  without considering the evaporation  of  rainwater, the 
rainbands simulated by the three boundary layer schemes are narrower, hourly precipitation is smaller, convective monomer moves 
slower, and the precipitation overlap area is more. The simulated radar reflectivity intensity is significantly reduced and the echo 
band is narrower. Whether rain evaporation is considered or not, the YSU scheme simulates the strongest precipitation and radar 
reflectivity,  MRF  scheme  is  close  to  it  and  the  UW  scheme  is  the  weakest.  By  analyzing  the  macro  conditions  of  convection 
development, it can be seen that under the condition of considering the rainwater evaporation, high and low altitude divergence 
configuration simulated by the three boundary layer schemes is better, the water vapor transport is more abundant, updraft and 
downdraft are stronger, providing more favorable conditions for the occurrence and development of strong convection. Whether 
rain evaporation is considered or not, the water vapor conditions and high and low altitude divergence configuration simulated by 
the YSU scheme are better, results simulated by MRF scheme is similar to YSU scheme. The convection generation condition 
simulated by the UW scheme is the weakest of the three schemes. Under the condition of considering the rainwater evaporation, 
more hydrogel particles simulated by three boundary layer schemes, and stronger updraft, which is more conducive to development 
of convection. Whether rain evaporation is considered or not, the MRF and YSU schemes can simulate more rain, mainly because 
the  vertical  movement  of  the  airflow  is  stronger,  and  more  cloud  water  becomes  cold  cloud  water  under  the  strong  ascending 
airflow, and more cold water frozen with graupel to form graupel, graupel melts to produce more rain. The UW scheme have poor 
macroscopic conditions, and the updraft is weaker. Cold cloud water is less, and cold cloud water and graupel are less frozen, 
resulting in less rainwater content