气候变化领域集成服务门户(CCPortal): A Column Canopy-Air Turbulent Diffusion Method for Different Canopy Structures

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DOI	10.1029/2018JD028883
	A Column Canopy-Air Turbulent Diffusion Method for Different Canopy Structures
	Chen, Xuelong; Massman, William J.; Su, Zhongbo
通讯作者	Chen, XL (通讯作者)
发表日期	2019
ISSN	2169-897X
EISSN	2169-8996
起始页码	488
结束页码	506
卷号	124 期号:2
英文摘要	An accurate simulation of the sensible heat flux (H) over vegetation from thermal remote sensing requires an a priori estimate of roughness length and the excess resistance parameter kB -1. Despite being the subject of considerable interest in hydrometeorology, there still does not exist a uniform method for estimating roughness length from remote sensing techniques. This study demonstrates a turbulent diffusion method to simulate canopy-air sensible heat. The performance of the roughness length scheme as described in Chen et al. (2013, https:// doi. org/ 10.1175/ JAMC-D-12-056.1) was examined by comparing simulated H to measured values at 28 flux tower stations, which include seven different land covers (needle forest, broadleaf forest, shrub, savanna, grassland, cropland, and sparsely vegetated land). The model predictions of H for grass, crop, and sparsely vegetated land compare favorably with observed values, when actual canopy height is given. H is significantly underestimated at forest sites due to a high value of kB -1. Among the different physical representations for the canopy, canopy-soil mixture, and soil component, it is found that such a high kB -1 value is caused by the high kB -1 value for the canopy part. The reasons for this high kB -1 were investigated from canopy-air physical process of turbulent diffusion. This study introduces the vertical foliage density information into a column canopy-air turbulent diffusion model to include the different momentum and heat transfer efficiencies in the vertical canopy layers to enhance the thermal turbulent transfer intensity above the tall canopy. The new model has been verified to provide accurate simulation over different canopy structures.
关键词	SURFACE-ENERGY-BALANCE ZERO-PLANE DISPLACEMENT ROUGHNESS LENGTH HEAT-TRANSFER LAND-SURFACE CONCENTRATION PROFILES FLUX PARAMETERIZATION SYSTEM SEBS MODEL HEIGHT
英文关键词	turbulent sensible heat flux; canopy-air interaction; roughness length; leaf drag coefficient; leaf heat transfer coefficients; within-canopy wind
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:000458845300004
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259494
推荐引用方式 GB/T 7714	Chen, Xuelong,Massman, William J.,Su, Zhongbo. A Column Canopy-Air Turbulent Diffusion Method for Different Canopy Structures[J]. 中国科学院青藏高原研究所,2019,124(2).
APA	Chen, Xuelong,Massman, William J.,&Su, Zhongbo.(2019).A Column Canopy-Air Turbulent Diffusion Method for Different Canopy Structures.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,124(2).
MLA	Chen, Xuelong,et al."A Column Canopy-Air Turbulent Diffusion Method for Different Canopy Structures".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 124.2(2019).