气候变化领域集成服务门户(CCPortal): Diurnal variability of atmospheric O-2, CO2, and their exchange ratio above a boreal forest in southern Finland

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DOI	10.5194/acp-23-851-2023
	Diurnal variability of atmospheric O-2, CO2, and their exchange ratio above a boreal forest in southern Finland
	Faassen, Kim A. P.; Nguyen, Linh N. T.; Broekema, Eadin R.; Kers, Bert A. M.; Mammarella, Ivan; Vesala, Timo; Pickers, Penelope A.; Manning, Andrew C.; Vila-Guerau de Arellano, Jordi; Meijer, Harro A. J.; Peters, Wouter; Luijkx, Ingrid T.
发表日期	2023
ISSN	1680-7316
EISSN	1680-7324
起始页码	851
结束页码	876
卷号	23 期号:2 页码:26
英文摘要	The exchange ratio (ER) between atmospheric O(2 )and CO2 is a useful tracer for better understanding the carbon budget on global and local scales. The variability of ER (in mol O(2 )per mol CO2) between terrestrial ecosystems is not well known, and there is no consensus on how to derive the ER signal of an ecosystem, as there are different approaches available, either based on concentration (ERatmos) or flux measurements (ERforest). In this study we measured atmospheric O-2 and CO2 concentrations at two heights (23 and 125 m) above the boreal forest in Hyytiala, Finland. Such measurements of O-2 are unique and enable us to potentially identify which forest carbon loss and production mechanisms dominate over various hours of the day. We found that the ERatmos signal at 23 m not only represents the diurnal cycle of the forest exchange but also includes other factors, including entrainment of air masses in the atmospheric boundary layer before midday, with different thermodynamic and atmospheric composition characteristics. To derive ERforest, we infer O(2 )fluxes using multiple theoretical and observation-based micro-meteorological formulations to determine the most suitable approach. Our resulting ERforest shows a distinct difference in behaviour between daytime (0.92 +/- 0.17 mol mol(-1)) and nighttime (1.03 +/- 0.05 mol mol(-1)). These insights demonstrate the diurnal variability of different ER signals above a boreal forest, and we also confirmed that the signals of ERatmos and ERforest cannot be used interchangeably. Therefore, we recommend measurements on multiple vertical levels to derive O-2 and CO2 fluxes for the ERforest signal instead of a single level time series of the concentrations for the ERatmos signal. We show that ERforest can be further split into specific signals for respiration (1.03 +/-; 0.05 mol mol-1) and photosynthesis (0.96 +/- 0.12 molmol(-1)). This estimation allows us to separate the net ecosystem exchange (NEE) into gross primary production (GPP) and total ecosystem respiration (TER), giving comparable results to the more commonly used eddy covariance approach. Our study shows the potential of using atmospheric O-2 as an alternative and complementary method to gain new insights into the different CO2 signals that contribute to the forest carbon budget.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000917234500001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273136
作者单位	Wageningen University & Research; University of Groningen; University of Helsinki; University of Helsinki; University of East Anglia; Max Planck Society
推荐引用方式 GB/T 7714	Faassen, Kim A. P.,Nguyen, Linh N. T.,Broekema, Eadin R.,et al. Diurnal variability of atmospheric O-2, CO2, and their exchange ratio above a boreal forest in southern Finland[J],2023,23(2):26.
APA	Faassen, Kim A. P..,Nguyen, Linh N. T..,Broekema, Eadin R..,Kers, Bert A. M..,Mammarella, Ivan.,...&Luijkx, Ingrid T..(2023).Diurnal variability of atmospheric O-2, CO2, and their exchange ratio above a boreal forest in southern Finland.ATMOSPHERIC CHEMISTRY AND PHYSICS,23(2),26.
MLA	Faassen, Kim A. P.,et al."Diurnal variability of atmospheric O-2, CO2, and their exchange ratio above a boreal forest in southern Finland".ATMOSPHERIC CHEMISTRY AND PHYSICS 23.2(2023):26.