Manganini Kevin

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  • Article
    River Inflow Dominates Methane Emissions in an Arctic Coastal System
    (American Geophysical Union, 2020-04-23) Manning, Cara C. ; Preston, Victoria Lynn ; Jones, Samantha F. ; Michel, Anna P. M. ; Nicholson, David P. ; Duke, Patrick J. ; Ahmed, Mohamed M. M. ; Manganini, Kevin ; Else, Brent G. T. ; Tortell, Philippe D.
    We present a year‐round time series of dissolved methane (CH4), along with targeted observations during ice melt of CH4 and carbon dioxide (CO2) in a river and estuary adjacent to Cambridge Bay, Nunavut, Canada. During the freshet, CH4 concentrations in the river and ice‐covered estuary were up to 240,000% saturation and 19,000% saturation, respectively, but quickly dropped by >100‐fold following ice melt. Observations with a robotic kayak revealed that river‐derived CH4 and CO2 were transported to the estuary and rapidly ventilated to the atmosphere once ice cover retreated. We estimate that river discharge accounts for >95% of annual CH4 sea‐to‐air emissions from the estuary. These results demonstrate the importance of resolving seasonal dynamics in order to estimate greenhouse gas emissions from polar systems.