气候变化领域集成服务门户(CCPortal): Uncertainties in Turbulent Statistics and Fluxes of CO2 Associated With Density Effect Corrections

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DOI	10.1029/2020GL088859
	Uncertainties in Turbulent Statistics and Fluxes of CO2 Associated With Density Effect Corrections
	Gao Z.; Liu H.; Arntzen E.; Mcfarland D.P.; Chen X.; Huang M.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:15
英文摘要	Density effect corrections (DECs) are applied to adjust raw CO2 fluxes measured by eddy covariance (EC) systems with open-path gas analyzers. DEC is also required for adjusting the measured CO2 concentration fluctuations to obtain the adjusted CO2 concentrations for analyzing turbulent statistics or quantifying fluxes. However, our data show that the power spectra of the DEC-adjusted CO2 concentrations are distorted in the high-frequency range, as compared with the corresponding spectra of temperature and water vapor density. This contradicts the similarity behavior of scalars, as suggested by Monin-Obukhov similarity theory. It is demonstrated that such a distortion is caused by the DEC-induced spikes in the DEC-adjusted CO2, altering turbulent statistics of CO2 and scalar similarity between CO2 and other scalars. Our results suggest that CO2 fluxes are overestimated by applying DEC especially under high Bowen ratio conditions, potentially leading to substantial uncertainties in long-term ecosystem carbon exchange in dry regions. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Earth sciences; Geophysics; CO2 concentration; Density effects; Ecosystem carbons; Eddy covariance; Gas analyzers; High frequency HF; Monin-Obukhov similarity theory; Turbulent statistics; Carbon dioxide; air temperature; Bowen ratio; carbon dioxide; carbon flux; concentration (composition); eddy covariance; spectral analysis; turbulence; uncertainty analysis; water vapor
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170012
作者单位	Department of Civil and Environmental Engineering, Washington State University, Pullman, WA, United States; Pacific Northwest National Laboratory, Richland, WA, United States
推荐引用方式 GB/T 7714	Gao Z.,Liu H.,Arntzen E.,et al. Uncertainties in Turbulent Statistics and Fluxes of CO2 Associated With Density Effect Corrections[J],2020,47(15).
APA	Gao Z.,Liu H.,Arntzen E.,Mcfarland D.P.,Chen X.,&Huang M..(2020).Uncertainties in Turbulent Statistics and Fluxes of CO2 Associated With Density Effect Corrections.Geophysical Research Letters,47(15).
MLA	Gao Z.,et al."Uncertainties in Turbulent Statistics and Fluxes of CO2 Associated With Density Effect Corrections".Geophysical Research Letters 47.15(2020).