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

中文翻译：

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冰盖期间大气压力变化对甲烷沸腾和湖泊浊度的影响

来自湖泊沉积物的甲烷沸腾（冒泡）是进入大气的重要甲烷通量。以前的研究集中在开放水域季节，表明温度变化、压力波动和风引起的洋流会影响沸腾。然而，尽管季节性冰覆盖的湖泊普遍存在，但冰盖期间的沸腾调查很少见，并且控制沸腾的因素知之甚少。在这里，我们展示了来自冰盖湖泊的为期一个月的高频声波沸腾数据记录。记录显示，沸腾几乎只发生在大气压力低于大约等于长期平均压力的阈值时。沸腾的强度与压力下降到该阈值以下的量成正比。此外，