CAJ | 학술논문

在中尺度区域模式MM4的基础上对其中的湍流参数化方法作了改进，用湍流动能参数化方法代替原有的总体边界层方案中的局地K闭合，以高精度边界层方案作为控制方案，重点对1997-07-17的徐州暴雨进行了模拟。对湍流场的计算表明，这种闭合得到了合理的湍流场，代入模式计算稳定，预报的各物理量空间分布和原来的预报场相似，24h降水预报的位置没有改进，但是降水量有所提高，表明用湍流动能闭合方法代替局地K闭合是一种有希望的研究方向。该方法得到了比原模式中的湍流闭合方案更加合理的湍流扩散参数，对中尺度模式的改进有所帮助。
재중척도구역모식MM4적기출상대기중적단류삼수화방법작료개진，용단류동능삼수화방법대체원유적총체변계층방안중적국지K폐합，이고정도변계층방안작위공제방안，중점대1997-07-17적서주폭우진행료모의。대단류장적계산표명，저충폐합득도료합리적단류장，대입모식계산은정，예보적각물리량공간분포화원래적예보장상사，24h강수예보적위치몰유개진，단시강수량유소제고，표명용단류동능폐합방법대체국지K폐합시일충유희망적연구방향。해방법득도료비원모식중적단류폐합방안경가합리적단류확산삼수，대중척도모식적개진유소방조。
The improvement to the turbulence parameterization of meso-scale forecast model MM4 was presented.A turbulent kinematic energy(TKE)parameterization is used all over the forecast time in the whole model region to take the local K-theory's place in the bulk aerodynamic parameterization of the host model MM4,while MM4 with the high-resolution PBL parameterization is used as control forecast.MM4 with different parameterizations was utilized on the forecast of rainstorm on July 17,1997,and new TKE parameterization introduced a reasonable distribution of turbulent variables.The computational stability is good and the forecast results of different variables are close to or better than those of the control model,Although locations of the strongest rainfall do not show any improvement,the amount of the 24-hour rainfall is larger than that forecasted by the control model.This amount is still not as large as the actual rainfall,but this result shows that the TKE parameterization is encouraging.The application of TKE parameterization readjusts the distribution of eddy viscosity,Km,and hence improves the model.