Study on the processing method of nighttime CO2 eddy covariance flux data in ChinaFLUX
文献类型：SCI/SSCI论文
| 作者 | Tian J. |
| 发表日期 | 2006 |
| 关键词 | eddy covariance nighttime CO2 flux data correction ChinaFLUX water-vapor exchange terrestrial ecosystems soil respiration deciduous forest carbon-dioxide long-term temperature dependence vegetation patterns |
| 英文摘要 | At present, using Eddy Covariance (EC) method to estimate the "true value" of carbon sequestration in terrestrial ecosystem arrests more attention. However, one issue is how to solve the uncertainty of observations (especially the nighttime CO2 flux data) appearing in post-processing CO2 flux data. The ratio of effective and reliable nighttime EC CO2 flux data to all nighttime data is relatively low (commonly, less than 50%) for all the long-term and continuous observation stations in the world. Thus, the processing method of nighttime CO2 flux data and its effect analysis on estimating CO2 flux annual sums are very important. In this paper, the authors analyze and discuss the reasons for underestimating nighttime CO2 flux using EC method, and introduce the general theory and method for processing nighttime CO2 flux data. By analyzing the relationship between nighttime CO2 flux and air fraction velocity u(.), we present an alternate method, Average Values Test (AVT), to determine the thresholds of fraction velocity (u(c)(.)) for screening the effective nighttime CO2 flux data. Meanwhile, taking the data observed in Yucheng and Changbai Mountains stations for an example, we analyze and discuss the effects of different methods or parameters on nighttime CO2 flux estimations. Finally, based on the data of part ChinaFLUX stations and related literatures, empirical models of nighttime respiration at different sites in ChinaFLUX are summarized. |
| 出处 | Science in China Series D-Earth Sciences |
| 卷 | 49 |
| 页 | 36-46 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 1006-9313 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/22197]  |
| 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 | Tian J.. Study on the processing method of nighttime CO2 eddy covariance flux data in ChinaFLUX. 2006. |
入库方式： OAI收割
来源：地理科学与资源研究所
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