干旱区生态环境知识资源中心(Arid): Data treatment and corrections for estimating H2O and CO2 isotope fluxes from high-frequency observations

Arid

DOI	10.5194/amt-16-5787-2023
	Data treatment and corrections for estimating H2O and CO2 isotope fluxes from high-frequency observations
	Moonen, Robbert P. J.; Adnew, Getachew A.; Hartogensis, Oscar K.; de Arellano, Jordi Vila-Guerau; Fontas, David J. Bonell; Rockmann, Thomas
通讯作者	Moonen, RPJ ; Adnew, GA
来源期刊	ATMOSPHERIC MEASUREMENT TECHNIQUES
ISSN	1867-1381
EISSN	1867-8548
出版年	2023
卷号	16 期号:23 页码:5787-5810
英文摘要	Current understanding of land-atmosphere exchange fluxes is limited by the fact that available observational techniques mainly quantify net fluxes, which are the sum of generally larger, bidirectional fluxes that partially cancel out. As a consequence, validation of gas exchange fluxes applied in models is challenging due to the lack of ecosystem-scale exchange flux measurements partitioned into soil, plant, and atmospheric components. One promising experimental method to partition measured turbulent fluxes uses the exchange-process-dependent isotopic fractionation of molecules like CO2 and H2O . When applying this method at a field scale, an isotope flux ( delta flux) needs to be measured. Here, we present and discuss observations made during the LIAISE (Land surface Interactions with the Atmosphere over the Iberian Semi-arid Environment) 2021 field campaign using an eddy covariance (EC) system coupled to two laser spectrometers for high-frequency measurement of the isotopic composition of H2O and CO2 . This campaign took place in the summer of 2021 in the irrigated Ebro River basin near Mollerussa, Spain, embedded in a semi-arid region. We present a systematic procedure to scrutinise and analyse measurements of the delta -flux variable, which plays a central role in flux partitioning. Our experimental data indicated a larger relative signal loss in the delta fluxes of H2O compared to the net ecosystem flux of H2O , while this was not true for CO2 . Furthermore, we find that mole fractions and isotope ratios measured with the same instrument can be offset in time by more than a minute for the H2O isotopologues due to the isotopic memory effect. We discuss how such artefacts can be detected and how they impact flux partitioning. We argue that these effects are likely due to condensation of water on a cellulose filter in our inlet system. Furthermore, we show that these artefacts can be resolved using physically sound corrections for inlet delays and high-frequency loss. Only after such corrections and verifications are made can ecosystem-scale fluxes be partitioned using isotopic fluxes as constraints, which in turn allows for conceptual land-atmosphere exchange models to be validated.
类型	Article
语种	英语
开放获取类型	Green Submitted, gold
收录类别	SCI-E
WOS记录号	WOS:001171631900001
WOS关键词	EDDY COVARIANCE MEASUREMENTS ; WATER-VAPOR ; CARBON-DIOXIDE ; ATMOSPHERE EXCHANGE ; BIOSPHERE ; OXYGEN ; DELTA-O-18 ; IMPACT
WOS类目	Meteorology & Atmospheric Sciences
WOS研究方向	Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/395498
推荐引用方式 GB/T 7714	Moonen, Robbert P. J.,Adnew, Getachew A.,Hartogensis, Oscar K.,et al. Data treatment and corrections for estimating H2O and CO2 isotope fluxes from high-frequency observations[J],2023,16(23):5787-5810.
APA	Moonen, Robbert P. J.,Adnew, Getachew A.,Hartogensis, Oscar K.,de Arellano, Jordi Vila-Guerau,Fontas, David J. Bonell,&Rockmann, Thomas.(2023).Data treatment and corrections for estimating H2O and CO2 isotope fluxes from high-frequency observations.ATMOSPHERIC MEASUREMENT TECHNIQUES,16(23),5787-5810.
MLA	Moonen, Robbert P. J.,et al."Data treatment and corrections for estimating H2O and CO2 isotope fluxes from high-frequency observations".ATMOSPHERIC MEASUREMENT TECHNIQUES 16.23(2023):5787-5810.