干旱区生态环境知识资源中心(Arid): Quantitative analysis of diurnal CO2 flux variations above an alkaline playa

Arid

DOI	10.1002/vzj2.20292
	Quantitative analysis of diurnal CO2 flux variations above an alkaline playa
	Doucet, Anne-Martine; Jones, Frances; Raymond, Katherine E.; Dipple, Gregory; Black, Thomas Andrew; Ladd, Bethany; Mayer, Klaus Ulrich
通讯作者	Doucet, AM
来源期刊	VADOSE ZONE JOURNAL
EISSN	1539-1663
出版年	2023
卷号	22 期号:6
英文摘要	The alkaline playas at Atlin, BC, provide a unique opportunity for studying the carbonate-bicarbonate system and carbonate mineral stability at the Earth's surface. In this study, dynamic closed chambers (DCCs) and pore-gas sampling were used to directly quantify carbon dioxide (CO2) emission rates and characterize processes governing the CO2 exchange across the playa-atmosphere interface. Data were collected at the Atlin site continuously over 27 days in 2020 and 14 days in 2021. Results indicate minimal net exchange of CO2 across the playa-atmosphere interface during the monitoring periods, with average fluxes over the two periods of -0.03 and 0.09 mu mol m(-2) s(-1) in 2020 and 2021, respectively. However, distinct diurnal oscillations of CO2 fluxes were measured with average daytime fluxes of 0.15 +/- 0.34 mu mol m(-2) s(-1) (2020) and 0.15 +/- 0.19 mu mol m(-2) s(-1) (2021) and nighttime fluxes of -0.24 +/- 0.31 mu mol m(-2) s(-1) (2020) and 0.04 +/- 0.18 mu mol m(-2) s(-1) (2021). These observations, supported by reactive transport modeling, indicate that CO2 exchange is predominantly governed by changes in CO2 solubility in alkaline porewater related to diurnal temperature fluctuations and variations in CO2 concentrations in ambient air above the ground surface. Even though CO2 concentrations exceed 8000 ppmv at 1-m depth, CO2 emissions to the atmosphere were found to be minimal, likely due to high moisture contents, low connectivity, and tortuosity, limiting upward CO2 migration. These findings provide insights into CO2 flux dynamics in alkaline arid regions and show promise for the application of the DCC method for monitoring ex situ carbon mineralization at sites with enhanced mineral weathering.
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:001103004400001
WOS关键词	BRITISH-COLUMBIA ; SOIL ; CARBONATE ; DESERT ; HYDROMAGNESITE ; DISPOSAL ; EXCHANGE ; ATLIN
WOS类目	Environmental Sciences ; Soil Science ; Water Resources
WOS研究方向	Environmental Sciences & Ecology ; Agriculture ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/398961
推荐引用方式 GB/T 7714	Doucet, Anne-Martine,Jones, Frances,Raymond, Katherine E.,et al. Quantitative analysis of diurnal CO2 flux variations above an alkaline playa[J],2023,22(6).
APA	Doucet, Anne-Martine.,Jones, Frances.,Raymond, Katherine E..,Dipple, Gregory.,Black, Thomas Andrew.,...&Mayer, Klaus Ulrich.(2023).Quantitative analysis of diurnal CO2 flux variations above an alkaline playa.VADOSE ZONE JOURNAL,22(6).
MLA	Doucet, Anne-Martine,et al."Quantitative analysis of diurnal CO2 flux variations above an alkaline playa".VADOSE ZONE JOURNAL 22.6(2023).