DOI: 10.1016/j.atmosenv.2013.10.034
Scopus记录号: 2-s2.0-84890092207
论文题名: Assessment of error propagation in measured flux values obtained using an eddy diffusivity based micrometeorological setup
作者: Mukherjee S ; , Sturman A ; P ; , McMillan A ; M ; S ; , Harvey M ; J ; , Zawar-Reza P
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 84 起始页码: 144
结束页码: 155
语种: 英语
英文关键词: Eddy covariance
; Eddy diffusivity
; Error propagation
; Flux gradient
Scopus关键词: Estimation
; Heat flux
; Random errors
; Stability
; Atmospheric surface layers
; Concentration fluctuation
; Concentration gradients
; Eddy covariance
; Eddy Diffusivities
; Error propagation
; Flux gradients
; Thermodynamic approaches
; Diffusion
; nitrogen oxide
; concentration (composition)
; eddy
; error analysis
; flux measurement
; micrometeorology
; Monte Carlo analysis
; nitrous oxide
; parameterization
; surface layer
; thermodynamics
; article
; Eddy covariance
; equipment
; gas
; meteorology
; micropropagation
; Monte Carlo method
; nonhuman
; priority journal
; random error
; surface property
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: The flux gradient-eddy covariance approach is commonly used to measure fluxes of trace species at a field scale, and is particularly useful when fluxes must be measured at several locations using a single instrument, or where instrumentation is not capable of measuring concentration fluctuations at a high frequency. In addition to the need to resolve very small vertical concentration gradient, the technique also requires the estimation of eddy diffusivity. Here we perform an analysis to determine the sensitivity of the technique to errors in the estimation of this term. The eddy diffusivities, also termed as transfer coefficients, were estimated using a thermodynamic approach (denoted here as kht) and a parameterization approach (denoted here as dhp). The transfer coefficients in both approaches were calculated from several other surface layer variables. We derived algebraic expressions describing the relationships between the error terms of the transfer coefficients and their component variables. Based on these relationships, a Monte-Carlo type analysis was performed to explore the dependency of the transfer coefficients on their contributing factors over a range of stability conditions in the atmospheric surface layer. Finally, the total relative uncertainty in the flux values due to errors in transfer coefficient and concentration differences were estimated.We found that the mean relative error in kht is higher (15%) than the mean relative error in dhp (≈8%), irrespective of stability. However, depending on the initial uncertainty among the surface layer variables, the uncertainty can range up to 80% and 49% for both kht and dhp, irrespective of stability. Under most conditions, total error contribution in kht was found to be associated more with the temperature gradient term than the heat flux term, whereas the error contribution for dhp was found to be associated more with the u{star operator} term than the L term. Errors in the concentration differences were estimated based on the minimum resolvable estimates from the gas analyzer and the associated random errors were found to be 6% and 8% for unstable and stable conditions. Finally, the total mean error in the N2O flux values was found to be approximately of the order of 9% and 12% for the parameterization method for unstable and stable conditions, respectively, and 16.5% for the thermal method, irrespective of stability. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81025
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Centre for Atmospheric Research, University of Canterbury, Private Bag 4800, Christchurch 8040, New Zealand; National Institute of Water and Atmospheric Research, 301 Evans Bay Parade, Wellington 6021, New Zealand; Manaaki Whenua-Landcare Research, Private Bag 11052, Manawatu Mail Centre, Palmerston North 4442, New Zealand
Recommended Citation:
Mukherjee S,, Sturman A,P,et al. Assessment of error propagation in measured flux values obtained using an eddy diffusivity based micrometeorological setup[J]. Atmospheric Environment,2014-01-01,84