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	Upscaling analysis of aerodynamic roughness length based on in situ data at different spatial scales and remote sensing in north Tibetan Plateau
	Sun, Genhou1,2; Hu, Zeyong1,3; Wang, Jiemin1; Xie, Zhipeng1,2; Lin, Yun1,2; Huang, Fangfang1,2
刊名	ATMOSPHERIC RESEARCH
	2016-07-01
卷号	176页码:231-239
关键词	Aerodynamic roughness length Upscaling analysis Massman model EC and LAS LAI
ISSN号	0169-8095
DOI	10.1016/j.atmosres.2016.02.025
通讯作者	Hu, Zeyong(zyhu@lzb.ac.cn)
英文摘要	The aerodynamic roughness length (Z(0m)) is a crucial parameter in quantifying momentum, sensible and latent heat fluxes between land surface and atmosphere, and it depends greatly on spatial scales. This paper presents a tentative study on the upscaling analysis of z(0m) in the north Tibetan Plateau based on in situ data from eddy covariance (EC) and large aperture scintillometer (LAS) and leaf area index (LAI) of MODerate-resolution Imaging Spectroradiometer (MODIS) with 250 m and 2 km spatial resolutions. The comparison of z(0m) calculated from EC (z(0m_EC)) and LAS (z(0m_LAS)) data indicates that z(0m) at both scales has apparent seasonal variations and is in good agreement with the LAI result However, z(0m_LAS) is higher than z(0m_EC) which is attributed to the differences in roughness elements in their footprints. An upscaling relationship for z(0m) is developed with Z(0m_EC), Z(0m_IAS) and LAI with 250 m spatial resolution of MODIS. In addition, an altitude correction factor is introduced into the vegetation height estimation equation because the cold environment in the north Tibetan Plateau, which is due to its high altitude, has a strong influence on vegetation height. The z(0m) retrieval with 250 m spatial resolution in the rain season is validated with z(0m_EC) at sites Nagqu/Amdo, Nagqu/MS3478 and Nagqu/NewD66, and the agreement is acceptable. The spatial distribution of z(0m) retrievals at small spatial scale in the north Tibetan Plateau from June to September 2012 shows that the z(0m) values are less than 0.015 m in most areas, with the exception of the area in the southeast part, where z(0m) reaches 0.025 m owing to low altitudes. The z(0m), retrievals at large spatial scale in the north Tibetan Plateau from June to September 2012 range from 0.015 to 0.065 m, and high values appear in the area with low altitudes. The spatial distribution and frequency statistics of Z(0m) retrievals at both spatial scales reveal the influence of altitude and LAI on the z(0m) in the north Tibetan Plateau, suggesting the uniqueness of the Tibetan Plateau. (C) 2016 Elsevier B.V. All rights reserved.
收录类别	SCI
WOS关键词	SURFACE HEAT FLUXES ; APERTURE SCINTILLOMETER MEASUREMENTS ; BULK TRANSFER-COEFFICIENTS ; ZERO-PLANE DISPLACEMENT ; BALANCE SYSTEM SEBS ; EDDY-COVARIANCE ; ARBITRARY STRUCTURE ; RIVER-BASIN ; ASTER DATA ; ENERGY
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
语种	英语
出版者	ELSEVIER SCIENCE INC
WOS记录号	WOS:000374625100019
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2557299
专题	寒区旱区环境与工程研究所
通讯作者	Hu, Zeyong
作者单位	1.Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Key Lab Land Proc & Climate Change Cold & Arid Re, Lanzhou 730000, Gansu, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Sun, Genhou,Hu, Zeyong,Wang, Jiemin,et al. Upscaling analysis of aerodynamic roughness length based on in situ data at different spatial scales and remote sensing in north Tibetan Plateau[J]. ATMOSPHERIC RESEARCH,2016,176:231-239.
APA	Sun, Genhou,Hu, Zeyong,Wang, Jiemin,Xie, Zhipeng,Lin, Yun,&Huang, Fangfang.(2016).Upscaling analysis of aerodynamic roughness length based on in situ data at different spatial scales and remote sensing in north Tibetan Plateau.ATMOSPHERIC RESEARCH,176,231-239.
MLA	Sun, Genhou,et al."Upscaling analysis of aerodynamic roughness length based on in situ data at different spatial scales and remote sensing in north Tibetan Plateau".ATMOSPHERIC RESEARCH 176(2016):231-239.

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