Uncertainty analysis of eddy flux measurements in typical ecosystems of ChinaFLUX

NWIPB OpenIR

	Uncertainty analysis of eddy flux measurements in typical ecosystems of ChinaFLUX
	He, Honglin 1; Liu, Min 1,2; Sun, Xiaomin 1; Zhang, Li 1; Luo, Yiqi 3; Wang, Huiming 1; Han, Shijie 4; Zhao, Xinquan 5; Shi, Peili 1; Wang, Yanfen 2; Ouyang, Zhu 1; Yu, Guirui 1
	2010-11-01
发表期刊	ECOLOGICAL INFORMATICS
ISSN	1574-9541
卷号	5 期号:6 页码:492-502
文章类型	Article
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. (C) 2010 Elsevier B.V. All rights reserved.; Fluxes of CO2 (FCO2) 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 FCO2. 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 FCO2, 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 FCO2, LE, and H are not homogeneous and appear to be a linear function of flux magnitude. (3) Except for H. the RFEs of FCO2 and LE exhibit a distinct seasonal pattern. For FCO2, 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. (C) 2010 Elsevier B.V. All rights reserved.
关键词	Eddy Covariance Measurement Error Random Error Flux Uncertainty Chinaflux
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
关键词[WOS]	CARBON-DIOXIDE EXCHANGE ; LONG-TERM ; PARAMETER-ESTIMATION ; COVARIANCE TECHNIQUE ; WATER-VAPOR ; FOREST ; MODEL ; ERRORS ; RESPIRATION ; ALGORITHMS
收录类别	SCI
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Ecology
WOS记录号	WOS:000284198400007
引用统计	被引频次：18[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/1630
专题	中国科学院西北高原生物研究所
作者单位	1.Chinese Acad Sci, Key Lab Ecosyst Network Observat & Modeling, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China 2.Grad Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Univ Oklahoma, Dept Bot & Microbiol, Norman, OK 73019 USA 4.Chinese Acad Sci, Inst Appl Ecol, Shenyang 110016, Liaoning, Peoples R China 5.Chinese Acad Sci, NW Plateau Inst Biol, Xining 810001, Qinghai, Peoples R China
推荐引用方式 GB/T 7714	He, Honglin,Liu, Min,Sun, Xiaomin,et al. Uncertainty analysis of eddy flux measurements in typical ecosystems of ChinaFLUX[J]. ECOLOGICAL INFORMATICS,2010,5(6):492-502.
APA	He, Honglin.,Liu, Min.,Sun, Xiaomin.,Zhang, Li.,Luo, Yiqi.,...&Yu, Guirui.(2010).Uncertainty analysis of eddy flux measurements in typical ecosystems of ChinaFLUX.ECOLOGICAL INFORMATICS,5(6),492-502.
MLA	He, Honglin,et al."Uncertainty analysis of eddy flux measurements in typical ecosystems of ChinaFLUX".ECOLOGICAL INFORMATICS 5.6(2010):492-502.

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