| 对流边界层高度预报方案的改进 |
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| 引用本文： | 伍大洲,孙鉴泞,袁仁民,姚克亚.对流边界层高度预报方案的改进[J].中国科学技术大学学报,2006,36(10):1111-1116. |
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| 作者姓名： | 伍大洲 孙鉴泞 袁仁民 姚克亚 |
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| 作者单位： | 1. 南京大学大气科学系,江苏南京,210093
2. 中国科学技术大学地球与空间科学学院,安徽合肥,230026 |
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| 摘 要： | 基于对流边界层“一阶模型”,并考虑机械湍流和夹卷过程对对流边界层发展的贡献,提出了对流边界层顶部夹卷速度参数化的改进方案.理论分析表明,在对流边界层受热力湍流和机械湍流共同驱动的情况下,夹卷速度的参数化方案中应该包括机械湍流、热力湍流、夹卷过程和边界层顶上自由大气的逆温强度.用1979年7月美国CIRCE试验的边界层观测资料对改进后的参数化方案进行了对比验证,结果表明新方案能很好地预报对流边界层高度的演变过程.这一改进不仅使物理意义更加合理,也使夹卷速度参数化方案与实际大气状况符合得更好.
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| 关 键 词： | 对流边界层 夹卷速度 参数化 一阶模型 机械湍流 |
| 文章编号： | 0253-2778(2006)10-1111-06 |
| 收稿时间： | 03 14 2006 12:00AM |
| 修稿时间： | 06 7 2006 12:00AM |
An improvement on predicting the height of convective boundary layer |
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| WU Da-zhou,SUN Jian-ning,YUAN Ren-min,YAO Ke-ya.An improvement on predicting the height of convective boundary layer[J].Journal of University of Science and Technology of China,2006,36(10):1111-1116. |
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| Authors: | WU Da-zhou SUN Jian-ning YUAN Ren-min YAO Ke-ya |
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| Institution: | 1. Department of Atmospheric Sciences, Nanjing University, Nanjing, 210093,China ; 2. School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026,China |
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| Abstract: | Based on the "first-order model" of convective boundary layer(CBL),an improved parameterization for the entrainment rate of CBL was proposed.Analyses show that when the CBL is driven by both shear and buoyancy-turbulence,not only the contribution of buoyancy turbulence,but also the contributions of mechanical turbulence and entrainment process should be taken into account.The data measured during Central Illinois Rainfall Chemistry Experiment(CIRCE) were used to verify the validity of the improved parameterization.The results show that the new parameterization scheme can predict the development of the CBL height very nicely.This indicates that the improvement is reasonable and the new parameterization is applicable. |
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| Keywords: | convective boundary layer entrainment rate parameterization first-order model mechanical turbulence |
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