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	Turbulent exchange of heat, water vapor, and momentum over a Tibetan prairie by eddy covariance and flux variance measurements
	Choi, TJ; Hong, JK; Kim, J; Lee, HC; Asanuma, J; Ishikawa, H; Tsukamoto, O; Gao, ZQ; Ma, YM; Ueno, K
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
	2004-11-06
卷号	109期号:D21页码:12
关键词	Tibetan Plateau eddy covariance flux variance Monin-Obukhov theory
ISSN号	2169-897X
DOI	10.1029/2004JD004767
通讯作者	Choi, TJ(ctjin@yonsei.ac.kr)
英文摘要	[1] Land-atmosphere interactions on the Tibetan Plateau are important because of their influence on energy and water cycles on both regional and global scales. Flux variance and eddy covariance methods were used to measure turbulent fluxes of heat, water vapor, and momentum over a Tibetan shortgrass prairie during the Global Energy and Water Cycle Experiment (GEWEX) Asian Monsoon Experiment ( GAME) in 1998. Under unstable conditions during the monsoon period ( July - September), the observed standard deviations of temperature and specific humidity ( normalized by appropriate scaling parameters) followed the Monin-Obukhov theory. The similarity constants for heat C-T and water vapor C-q in their dimensionless functions of stability under a free convection limit were both 1.1, unlike the differences ( i.e., C-T less than or equal to C-q) reported in other studies. While the transfer efficiency of heat and water vapor exchange generally agreed with the prediction from the Monin-Obukhov theory, momentum exchange was less efficient than predicted. In comparison with the eddy covariance data, the flux variance method ( with C-T = C-q = 1.1) underestimated both heat and water vapor fluxes by < 5%. When the eddy covariance data were absent, the flux variance method was used for gap filling the seasonal flux database. To estimate latent heat flux during the premonsoon period in June, C-T/C-q was approximated as r(Tq) ( where r(Tq) is a correlation coefficient for the fluctuations of temperature and water vapor) because of the sensitivity of C-q to changes in soil moisture conditions. The dramatic changes in the Bowen ratio from 9.0 to 0.4 indicate the shift of energy sources for atmospheric heating over the plateau, which, in turn, resulted in the shift of turbulent exchange mechanisms for heat and water vapor.
收录类别	SCI
WOS关键词	ATMOSPHERIC SURFACE-LAYER ; MONIN-OBUKHOV SIMILARITY ; BOUNDARY-LAYER ; NONUNIFORM TERRAIN ; PLATEAU ; TEMPERATURE ; HUMIDITY ; VARIABILITY ; MONSOON ; UNIFORM
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000225031400007
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2556937
专题	寒区旱区环境与工程研究所
通讯作者	Choi, TJ
作者单位	1.Yonsei Univ, Dept Atmospher Sci, Seoul 120749, South Korea 2.Univ Tsukuba, Dept Geosci, Tsukuba, Ibaraki, Japan 3.Kyoto Univ, Disaster Prevent Res Inst, Kyoto, Japan 4.Okayama Univ, Fac Sci, Okayama 700, Japan 5.Chinese Adm Meteorol Sci, Beijing, Peoples R China 6.Univ Shiga Prefecture, Sch Environm, Shiga, Japan 7.Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou, Peoples R China 8.Univ Tokyo, Dept Civil Engn, Tokyo 113, Japan 9.Nagoya Univ, Hydrospher Atmospher Res Ctr, Nagoya, Aichi, Japan
推荐引用方式 GB/T 7714	Choi, TJ,Hong, JK,Kim, J,et al. Turbulent exchange of heat, water vapor, and momentum over a Tibetan prairie by eddy covariance and flux variance measurements[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2004,109(D21):12.
APA	Choi, TJ.,Hong, JK.,Kim, J.,Lee, HC.,Asanuma, J.,...&Yasunari, T.(2004).Turbulent exchange of heat, water vapor, and momentum over a Tibetan prairie by eddy covariance and flux variance measurements.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,109(D21),12.
MLA	Choi, TJ,et al."Turbulent exchange of heat, water vapor, and momentum over a Tibetan prairie by eddy covariance and flux variance measurements".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 109.D21(2004):12.

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