Interannual, summer, and diel variability of CH ₄ and CO ₂ effluxes from Toolik Lake, Alaska, during the ice-free periods 2010–2015

effluxes remained almost constant over the entire summer, ending with a linear increase during the last 1-2 weeks of measurements. Due to the cold bottom temperatures of this 26 m deep lake, and the absence of ebullition and episodic flux events, Toolik Lake and other deep glacial lakes are likely not hot spots for greenhouse gas emissions, but they still contribute to the overall GWP of the Arctic.