Effects of long-term climate trends on the methane and CO2 exchange processes of Toolik Lake, Alaska ...

Methane and carbon dioxide effluxes from aquatic systems in the Arctic will affect and likely amplify global change. As permafrost thaws in a warming world, more dissolved organic carbon (DOC) and greenhouse gases are produced and move from soils to surface waters where the DOC can be oxidized to CO...

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Bibliographic Details
Main Authors: Eugster, Werner, DelSontro, Tonya, Laundre, James A., Dobkowski, Jason, Shaver, Gaius R., Kling, George W.
Format: Article in Journal/Newspaper
Language:English
Published: ETH Zurich 2022
Subjects:
Toolik Lake
long-term ecological research
LTER
methane flux
carbon dioxide flux
piston velocity
arctic trends
quantile regression
Arctic
permafrost
Alaska
Online Access:https://dx.doi.org/10.3929/ethz-b-000571096
http://hdl.handle.net/20.500.11850/571096
Description
Summary:Methane and carbon dioxide effluxes from aquatic systems in the Arctic will affect and likely amplify global change. As permafrost thaws in a warming world, more dissolved organic carbon (DOC) and greenhouse gases are produced and move from soils to surface waters where the DOC can be oxidized to CO2 and also released to the atmosphere. Our main study objective is to measure the release of carbon to the atmosphere via effluxes of methane (CH4) and carbon dioxide (CO2) from Toolik Lake, a deep, dimictic, low-arctic lake in northern Alaska. By combining direct eddy covariance flux measurements with continuous gas pressure measurements in the lake surface waters, we quantified the k600 piston velocity that controls gas flux across the air–water interface. Our measured k values for CH4 and CO2 were substantially above predictions from several models at low to moderate wind speeds, and only converged on model predictions at the highest wind speeds. We attribute this higher flux at low wind speeds to effects on ... : Frontiers in Environmental Science, 10 ...

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