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Groundwater discharge drives water quality and greenhouse gas emissions in a tidal wetland

Water Science and Engineering 2022年第2期15卷 141-151页

作者： Zhi-lin Wang Mahmood Sadat-Noori william glamore Water Research Laboratory School of Civil&Environmental EngineeringUniversity of New South Wales SydneySydneyNSW 2052Australia

Wetlands play an important role in the global carbon cycle as they can be sources or sinks for greenhouse *** discharge into wetlands can affect the water chemistry and act as a source of dissolved greenhouse gases,including CO_(2)and CH_(4).In this study,surface water quality parameters and CO_(2)and CH_(4)concentrations were evaluated in a tidal wetland(Hunter Wetlands National Park,Australia)using time series ***(^(222)Rn),a natural ground water tracer,was used to investigate the role of groundwater as a pathway for transporting dissolved CO_(2)and CH_(4)into the *** addition,water-to-air CO_(2)and CH_(4)fluxes from the wetland were also *** results showed a high concentration of radon in wetland surface water,indicating the occurrence of ground water *** concentration had a strong negative relationship with water depth with a determination coefficient(R^(2))of 0.7,indicating that tidal pumping was the main driver of groundwater discharge to the *** concentration also showed a positive relationship with CO_(2)and CH_(4)concentrations(R^(2)=0.4 and 0.5,respectively),while the time series data revealed that radon,CO_(2),and CH_(4)concentrations peaked concurrently during low *** implied that groundwater discharge was a source of CO_(2)and CH_(4)to the *** wetland had an average water-to-air CO_(2)flux of 99.1 mmol/(m^(2)·d),twice higher than the global average CO_(2)flux from *** average CH_(4)flux from the wetland was estimated to be 0.3 mmol/(m^(2)d),which is at the higher end of the global CH_(4)flux range for *** results showed that groundwater discharge could be an important,yet unaccounted source of CO_(2)and CH_(4)to tidal *** work has implications for tidal wetland carbon budgets and emphasizes the role of groundwater as a subsurface pathway for carbon transport.

关键词： Groundwater discharge Methane Carbon dioxide Radon Global warming Climate change

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