Uncertainty analysis of eddy flux measurements in typical ecosystems of ChinaFLUX

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	Uncertainty analysis of eddy flux measurements in typical ecosystems of ChinaFLUX
	Yu, GR(于贵瑞)
刊名	ECOLOGICAL INFORMATICS
	2010
卷号	5 期号:6 页码:492-502
关键词	CARBON-DIOXIDE EXCHANGE
通讯作者	Yu GR(于贵瑞)
英文摘要	Fluxes of CO(2) (FCO(2)) and energy (latent heat, LE; sensible heat. H) exchange between ecosystems and atmosphere, as measured by the eddy covariance technique, represent a fundamental data source for global-change research. However, little is known about the uncertainties of flux measurements at an ecosystem level in China. Here, we use data from six eddy covariance tower sites in ChinaFLUX, including two forested sites, three grassland sites, and one agricultural site, to conduct a cross-site analysis of random flux errors (RFEs) of FCO(2). LE, and H. By using the daily-differencing approach, paired observations are obtained to characterize the random error in these measurements. Our results show that: (1) The RFEs of FCO(2), LE, and H in different ecosystems of ChinaFLUX closely follow a double-exponential (Laplace) distribution, presumably due to a superposition of Gaussian distribution for high flux magnitude. (2) The RFEs of FCO(2), LE, and H are not homogeneous and appear to be a linear function of flux magnitude. (3) Except for H. the RFEs of FCO(2) and LE exhibit a distinct seasonal pattern. For FCO(2), the dependence of RFEs on wind speed varies somewhat according to vegetation type, whereas for LE and H, there is no such dependence. The effect of temperature on RFEs is not statistically significant (P<0.05). Both the distribution and the relationship of RFEs with flux magnitude in ChinaFLUX are essentially in accord with those in AmeriFlux and CarboEurope.
学科主题	Ecology
收录类别	SCI
资助信息	National Key Basic Research and Development Program [2010CB833504]; Chinese Academy of Sciences [KZCX2-YW-433-06]; National Science Foundation of China [30590381, 30570347]
语种	英语
公开日期	2011-05-24
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/2909]
专题	地理科学与资源研究所_生态系统研究网络观测与模拟重点实验室_CERN水分分中心地理科学与资源研究所_区域可持续发展分析与模拟重点实验室_区域可持续发展模拟实验室
推荐引用方式 GB/T 7714	Yu, GR. Uncertainty analysis of eddy flux measurements in typical ecosystems of ChinaFLUX[J]. ECOLOGICAL INFORMATICS,2010,5(6):492-502.
APA	Yu, GR.(2010).Uncertainty analysis of eddy flux measurements in typical ecosystems of ChinaFLUX.ECOLOGICAL INFORMATICS,5(6),492-502.
MLA	Yu, GR."Uncertainty analysis of eddy flux measurements in typical ecosystems of ChinaFLUX".ECOLOGICAL INFORMATICS 5.6(2010):492-502.