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| 青藏高原当雄地区湍流脉动耗散率特征研究 | |
| 引用本文： | 李富余,张宏升,李诗明,周明煜,陈家宜,徐祥德,刘辉志,胡非.青藏高原当雄地区湍流脉动耗散率特征研究[J].北京大学学报(自然科学版),2004,40(5):781-787. |
| 作者姓名： | 李富余 张宏升 李诗明 周明煜 陈家宜 徐祥德 刘辉志 胡非 |
| 作者单位： | 1. 北京大学物理学院大气科学系暴雨与旱涝灾害教育部重点实验室,北京,100871 2. 北京大学物理学院大气科学系暴雨与旱涝灾害教育部重点实验室,北京,100871;中国科学院大气物理研究所大气边界层物理和大气化学国家重点实验室,北京,100029 3. 国家海洋环境预报中心,北京,100081 4. 中国气象科学研究院,北京,100081 5. 中国科学院大气物理研究所大气边界层物理和大气化学国家重点实验室,北京,100029 |
| 基金项目： | 国家自然科学基金，国家重点基础研究发展计划(973计划) |
| 摘 要： | 利用1998年第2次青藏高原气象科学实验(TIPEX)当雄地区观测站的湍流资料,分析了青藏高原中部地区湍流动能、温度脉动和湿度脉动耗散率的特征规律.结果表明,无量纲湍能耗散率φε、无量纲温度脉动耗散率φN和无量纲湿度脉动耗散率φγ分别比风速梯度产生的能量、温度和湿度梯度产生的脉动约小20%,且随稳定度参数的绝对值的增加而呈增加的趋势;湍流输送和压力脉动项的影响贯穿于整个稳定度区间, 数值与z/L相联系.青藏高原中部地区湍流动能、温度脉动和湿度脉动耗散率的方程中系数与前人结果的差异,反映其对下垫面特征的依赖性. |
| 关 键 词： | 耗散率 湍流动能 温度脉动 湿度脉动 观测法 |
The Characteristics of Dissipation Rates of Turbulent Variance over Damxung Area in the Tibetan Plateau |
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| LI Fuyu ZHANG Hongsheng , LI Shiming ZHOU Mingyu CHEN Jiayi XU Xiangde LIU Huizhi HU Fei.The Characteristics of Dissipation Rates of Turbulent Variance over Damxung Area in the Tibetan Plateau[J].Acta Scientiarum Naturalium Universitatis Pekinensis,2004,40(5):781-787. | |
| Authors: | LI Fuyu ZHANG Hongsheng LI Shiming ZHOU Mingyu CHEN Jiayi XU Xiangde LIU Huizhi HU Fei |
| Institution: | LI Fuyu 1) ZHANG Hongsheng 1,4) LI Shiming 2) ZHOU Mingyu 2) CHEN Jiayi 1) XU Xiangde 3) LIU Huizhi 4) HU Fei 4) |
| Abstract: | The turbulent data obtained from Damxung site during TIPEX in 1998 were used to study the characteristics of dissipation rates of turbulent kinetic energy, temperature variance and humidity variance in the middle area of Tibetan Plateau. The results indicate that the dimensionless dissipation rates of turbulent energy are 20% less than the energy produced by velocity shear, and the dimensionless temperature and humidity variances are also 20% less than the variances produced by temperature and humidity gradients. These deficits appear to increase with the increasing of the absolute stability parameter. Moreover, the effects of turbulent transportation and pressure variance, which are related with the stability parameter, persist throughout the whole stability region. The differences between these results and some previous studies show the underlying surface dependant characteristics of the dissipation rates of turbulent energy, temperature variance and humidity variance. |
| Keywords: | dissipation rate turbulent kinetic energy temperature variance humidity variance observational method |
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