Patterns and possible mechanisms of soil CO2 uptake in sandy soil

Fa, Keyu; Zhang, Yuqing; Wu, Bin; Qin, Shugao; Liu, Zhen; She, Weiwei

doi:10.1016/j.scitotenv.2015.11.163

Cited by 42 publications

(29 citation statements)

References 41 publications

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“…Natural and anthropogenic emissions are the two main sources of atmospheric greenhouse gases. Characterization of trace gas emissions from anthropogenic sources has improved over recent years due to increased reporting requirements (Etiope et al, ), so it is now urgent that we improve our knowledge of natural emissions (Fa et al, ; Guo et al, ).…”

Section: Introductionmentioning

confidence: 99%

CH₄and CO₂Emissions From Mud Volcanoes on the Southern Margin of the Junggar Basin, NW China: Origin, Output, and Relation to Regional Tectonics

Zhi

Liu

et al. 2019

JGR Solid Earth

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The concentrations, isotope ratios, and fluxes of CH 4 and CO 2 from mud volcanoes measured during a field survey on the southern margin of the Junggar Basin are reported. The origins and outputs of CH 4 and CO 2 from the four mud volcanoes are assessed, and the relationship between the characteristics of degassing and regional tectonics is discussed. The geochemical data indicate that thermogenic gases derived from the hydrocarbon reservoirs beneath anticlines could be the main source of the CH 4 emitted from the mud volcanoes and that hydrocarbon degradation by microbes and carbonate decomposition could be the primary contributors to CO 2 emissions from the soil in and around the mud volcanoes. Microseepage was the main mode of release for CH 4 and CO 2 from the mud volcanoes. The total CH 4 output from the mud volcanoes was 147.83 ton/year, comparable to that from mud volcanoes elsewhere. The total output of CO 2 from the mud volcanoes was 603.96 ton/year, which suggests that more attention should be paid to CO 2 from mud volcanoes. The CH 4 and CO 2 outputs from the mud volcanoes, and from the Xihu fold in the four anticlines, decreased from south to north. This observation is consistent with the intensity of regional tectonic activity, which weakens from south to north. The results suggest that regional compression is the major triggering mechanism for CH 4 and CO 2 emissions from the mud volcanoes.

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Section: Introductionmentioning

confidence: 99%

CH₄and CO₂Emissions From Mud Volcanoes on the Southern Margin of the Junggar Basin, NW China: Origin, Output, and Relation to Regional Tectonics

Zhi

Liu

et al. 2019

JGR Solid Earth

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“…One line of evidence for an abiotic C flux comes from eddy covariance and chamber methods [ Xie et al ., ; Yates et al ., ; Hamerlynck et al ., ; Ma et al ., ], indicating that several arid ecosystems appear to take up CO 2 at night and exhibit positive fluxes from dry soils during the day. These observations are supported by lab experiments showing uptake, and some subsequent release, of isotopically labeled CO 2 [ Liu et al ., ; Fa et al ., ], as well as diel changes in CO 2 concentration [ Yates et al ., ; Liu et al ., ; Fa et al ., ].…”

Section: Introductionmentioning

confidence: 99%

“…Dissolution of CO 2 in the soil solution follows Henry's law, being temperature dependent and proportional to the partial pressure of CO 2 in the soil [ Serrano‐Oritz et al ., ]. At night, cooling of dry soils drives upward air migration and deposition of water vapor, along with possible dew deposition, that causes CO 2 uptake and subsequent CaCO 3 dissolution [ Hamerlynck et al ., ; Fa et al ., ], according to

{normalC normalO}_{2} + H_{2} normalO ⇄ {H C O}_{3}^{-} + H^{+}

{CaCO}_{3} + H^{+} ⇄ {normalC normala}^{2 prefix+} {+ H C O}_{3}^{-}

…”

Section: Introductionmentioning

confidence: 99%

“…Under dry conditions, the proposed mechanism for these fluxes has some uncertainties [Fa et al, 2016b] but seems to be driven by a diel cycle in which changes in soil temperature shift the CO 2 -carbonatebicarbonate equilibrium, with added effects of turbulence and gas expansion driving convection [Hamerlynck et al, 2013;Fa et al, 2016b]. Dissolution of CO 2 in the soil solution follows Henry's law, being temperature dependent and proportional to the partial pressure of CO 2 in the soil [Serrano-Oritz et al, 2010] Supporting Information:…”

Section: Introductionmentioning

confidence: 99%

“…• Table S2 possible dew deposition, that causes CO 2 uptake and subsequent CaCO 3 dissolution [Hamerlynck et al, 2013;Fa et al, 2016b], according to…”

Section: Introductionmentioning

confidence: 99%

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Soil carbon dioxide emissions from the Mojave desert: Isotopic evidence for a carbonate source

Soper

McCalley

Sparks

et al. 2017

Geophysical Research Letters

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Arid soils represent a substantial carbonate pool and may participate in surface‐atmosphere CO2 exchange via a diel cycle of carbonate dissolution and exsolution. We used a Keeling plot approach to determine the substrate δ13C of CO2 emitted from carbonate‐dominated soils in the Mojave desert and found evidence for a nonrespiratory source that increased with surface temperature. In dry soils at 25–30°C, the CO2 substrate had δ13C values of −19.4 ± 4.2‰, indicative of respiration of organic material (soil organic matter = −23.1 ± 0.8‰). CO2 flux increased with temperature; maximum fluxes occurred above 60°C, where δ13CO2 substrate (−7.2‰ ± 2.8‰) approached soil carbonate values (0.2 ± 0.2‰). In wet soils, CO2 emissions were not temperature dependent, and δ13CO2 substrate was lower in vegetated soils with higher flux rates, higher organic C content, and potential root respiration. These data provide the first direct evidence of CO2 emissions from alkaline desert soils derived from an abiotic source and that diurnal emission patterns are strongly driven by surface temperature.

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Quantitative analysis of diurnal CO₂ flux variations above an alkaline playa

Doucet,

Jones,

Raymond

et al. 2023

Vadose Zone Journal

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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 µmol 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 µmol m−2 s−1 (2020) and 0.15 ± 0.19 µmol m−2 s−1 (2021) and nighttime fluxes of −0.24 ± 0.31 µmol m−2 s−1 (2020) and 0.04 ± 0.18 µmol 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.

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Patterns and possible mechanisms of soil CO2 uptake in sandy soil

Cited by 42 publications

References 41 publications

CH₄and CO₂Emissions From Mud Volcanoes on the Southern Margin of the Junggar Basin, NW China: Origin, Output, and Relation to Regional Tectonics

CH₄and CO₂Emissions From Mud Volcanoes on the Southern Margin of the Junggar Basin, NW China: Origin, Output, and Relation to Regional Tectonics

Soil carbon dioxide emissions from the Mojave desert: Isotopic evidence for a carbonate source

Quantitative analysis of diurnal CO₂ flux variations above an alkaline playa

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Patterns and possible mechanisms of soil CO2 uptake in sandy soil

Cited by 42 publications

References 41 publications

CH4and CO2Emissions From Mud Volcanoes on the Southern Margin of the Junggar Basin, NW China: Origin, Output, and Relation to Regional Tectonics

CH4and CO2Emissions From Mud Volcanoes on the Southern Margin of the Junggar Basin, NW China: Origin, Output, and Relation to Regional Tectonics

Soil carbon dioxide emissions from the Mojave desert: Isotopic evidence for a carbonate source

Quantitative analysis of diurnal CO2 flux variations above an alkaline playa

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Product

Resources

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CH₄and CO₂Emissions From Mud Volcanoes on the Southern Margin of the Junggar Basin, NW China: Origin, Output, and Relation to Regional Tectonics

CH₄and CO₂Emissions From Mud Volcanoes on the Southern Margin of the Junggar Basin, NW China: Origin, Output, and Relation to Regional Tectonics

Quantitative analysis of diurnal CO₂ flux variations above an alkaline playa