UU* filtering of nighttime net ecosystem CO2 exchange flux over forest canopy under strong wind in wintertime

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	*UU filtering of nighttime net ecosystem CO2 exchange flux over forest canopy under strong wind in wintertime**
	Zhang, JH; Han, SJ; Sun, XM; Tang, FD; Zhang, JH, Chinese Acad Sci, Inst Appl Ecol, Shenyang 110016, Peoples R China
刊名	SCIENCE IN CHINA SERIES D-EARTH SCIENCES
	2005
卷号	48 页码:85-92
关键词	Night In wIntertime Negative Nee Eddy-covariance Pressure Fluctuation Uu** Filtering
ISSN号	1006-9313
英文摘要	The mechanism of the negative nighttime net CO2 flux in wintertime and reasonable treatment with it is of great importance in evaluating the carbon metabolism of boreal forest. Results, based on the data obtained with open-path eddy covariance system and CO2 profile measurement system from Nov. 2002 to Apr. 2003 and that obtained with five sonic anemometers in Nov. 1999, show that (1) the negative net ecosystem CO2 exchange flux (NEE) always appeared under conditions of strong wind; (2) the pressure fluctuation and horizontal advection flow are dominantly responsible for the negative NEE. Operable upper bound u() filtering method (UU filtering) was introduced since the difficulties in real-time measuring of pressure fluctuation and horizontal advection fluxes under conditions of strong wind. Nighttime upper u() threshold for the broad-leaved Korean pine mixed forest of the Changbai Mountains is 0.4 ms(-1) and can be applied to the daytime filtering; and (3) the UU filtering corrected the nighttime 'problem' of negative NEE under strong wind and made the estimates more ecologically reasonable.
学科主题	Geosciences, Multidisciplinary
语种	英语
WOS记录号	WOS:000229942300008
公开日期	2011-09-23
内容类型	期刊论文
源URL	[http://210.72.129.5/handle/321005/55115]
专题	沈阳应用生态研究所_沈阳应用生态研究所
通讯作者	Zhang, JH, Chinese Acad Sci, Inst Appl Ecol, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Zhang, JH,Han, SJ,Sun, XM,et al. UU* filtering of nighttime net ecosystem CO2 exchange flux over forest canopy under strong wind in wintertime[J]. SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2005,48:85-92.
APA	Zhang, JH,Han, SJ,Sun, XM,Tang, FD,&Zhang, JH, Chinese Acad Sci, Inst Appl Ecol, Shenyang 110016, Peoples R China.(2005).UU* filtering of nighttime net ecosystem CO2 exchange flux over forest canopy under strong wind in wintertime.SCIENCE IN CHINA SERIES D-EARTH SCIENCES,48,85-92.
MLA	Zhang, JH,et al."UU* filtering of nighttime net ecosystem CO2 exchange flux over forest canopy under strong wind in wintertime".SCIENCE IN CHINA SERIES D-EARTH SCIENCES 48(2005):85-92.