Seasonal, Diurnal and Wind-Direction-Dependent Variations of the Aerodynamic Roughness Length in Two Typical Forest Ecosystems of China
文献类型：SCI/SSCI论文
| 作者 | Zhou Y. L. ; Sun X. M. ; Ju W. M. ; Wen X. F. ; Guan D. X. |
| 发表日期 | 2012 |
| 关键词 | Aerodynamic roughness Seasonal variation Diurnal variation Wind-direction-dependent variation zero-plane displacement pine mixed forest energy fluxes co2 flux canopy height land-surface area index water-use exchange heat |
| 英文摘要 | Aerodynamic roughness length (z(om)) is an important parameter for reliably simulating surface fluxes. The parameter varies with wind speed, atmospheric stratification, terrain and other factors; however, variations of this parameter are not properly considered in most models, which may result in uncertainties in simulating surface latent heat and sensible heat flux. There have been few studies of the diurnal and wind-direction dependent variations in z(om). This study analyzes the seasonal, diurnal and wind-direction-dependent variations in z(om) calculated from the profile of meteorological data for two forest systems of China, and explores the mechanism underlying these variations. Annually averaged and monthly averaged diurnal variations in z(om) are obvious and similar at a Changbai Mountain (CBS) site located in northeast China and a Qianyanzhou (QYZ) site located in southeast China. z(om) is much higher at night than during the day. The diurnal variation in z(om) is due to a change in atmospheric stratification. The seasonality of z(om) differs at two sites. z(om) has sizable seasonal variation and is lower in the leaf-off season than in the growing season at CBS. At QYZ, z(om) does not have an obvious seasonal pattern. However, at QYZ, the short-term fluctuation is greater than that at CBS. The obvious seasonal variation in z(om) at CBS is related to the great seasonal change in the leaf area index. The noticeable short-term wind-direction-dependent variations in z(om) at QYZ are attributed to the heterogeneous terrain there. |
| 出处 | Terrestrial Atmospheric and Oceanic Sciences |
| 卷 | 23 |
| 期 | 2 |
| 页 | 181-191 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 1017-0839 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/26674]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Zhou Y. L.,Sun X. M.,Ju W. M.,et al. Seasonal, Diurnal and Wind-Direction-Dependent Variations of the Aerodynamic Roughness Length in Two Typical Forest Ecosystems of China. 2012. |
入库方式： OAI收割
来源：地理科学与资源研究所
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