Impact of atmospheric pressure variations on methane ebullition and lake turbidity during ice‐cover

Methane ebullition (bubbling) from lake sediments is an important methane flux into the atmosphere. Previous studies have focused on open-water season, showing that temperature variations, pressure fluctuations, and wind-induced currents can affect ebullition. However, surveys during ice-cover are rare despite prevalence of seasonally ice-covered lakes, factors controlling poorly understood. Here, we present a month-long, high frequency record acoustic data lake. The shows occurs almost exclusively when atmospheric drops below threshold approximately equal to long-term average pressure. intensity proportional amount by which this threshold. In addition, field measurements turbidity, in conjunction with laboratory experiments, provide evidence responsible for previously unexplained elevated levels turbidity ice-cover.