Uncertainty analysis of eddy flux measurements in typical ecosystems of ChinaFLUX
文献类型：SCI/SSCI论文
| 作者 | Zhang L.; Zhang L. |
| 发表日期 | 2010 |
| 关键词 | Eddy covariance Measurement error Random error Flux Uncertainty ChinaFLUX carbon-dioxide exchange long-term parameter-estimation covariance technique water-vapor forest model errors respiration algorithms |
| 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. (C) 2010 Elsevier B.V. All rights reserved. |
| 出处 | Ecological Informatics |
| 卷 | 5 |
| 期 | 6 |
| 页 | 492-502 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 1574-9541 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/23880]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Zhang L.,Zhang L.. Uncertainty analysis of eddy flux measurements in typical ecosystems of ChinaFLUX. 2010. |
入库方式： OAI收割
来源：地理科学与资源研究所
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