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River Inflow Dominates Methane Emissions in an Arctic Coastal System Manning, Cara C.; Preston, Victoria L.; 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 Daniel, 1972-
Abstract
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.
Item Metadata
Title |
River Inflow Dominates Methane Emissions in an Arctic Coastal System
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Creator | |
Publisher |
Geophysical Research Letters
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Date Issued |
2020-04-23
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Description |
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.
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Subject | |
Genre | |
Type | |
Language |
eng
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Date Available |
2020-10-23
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Provider |
Vancouver : University of British Columbia Library
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Rights |
Attribution-NoDerivatives 4.0 International
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DOI |
10.14288/1.0394393
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URI | |
Affiliation | |
Citation |
Manning, C. C., Preston, V. L., Jones, S. F., Michel, A. P. M., Nicholson, D. P., Duke, P. J., et al. (2020). River inflow dominates methane emissions in an Arctic coastal system. Geophysical Research Letters, 47, e2020GL087669
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Publisher DOI |
10.1029/2020GL087669
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Peer Review Status |
Reviewed
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Scholarly Level |
Faculty; Researcher; Postdoctoral; Graduate
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Copyright Holder |
American Geophysical Union
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Rights URI | |
Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
Attribution-NoDerivatives 4.0 International