Atmospheric pressure influencing ebullition and turbidity

<b>Abstract</b><br/><p>Methane ebullition from lake sediment is an important source of atmospheric methane. Previous studies have suggested that temperature variations, water level changes, atmospheric pressure fluctuations and wind-induced current can affect ebullition. However, most of those studies were conducted during open-water season. There is a lack of observations during ice-cover, despite of the abundance of seasonally ice-covered lakes.</p> <p>In this dataset, we present high-frequency ebullition intensity data, atmospheric pressure data, bottom-water temperature data, and turbidite data from Base Mine Lake (57° 1' N, 111° 37' W in Alberta, Canada) during ice cover. During the study period, the water level in the lake is stable. Also, due to the ice cover, the impact of wind-induced current is negligible. The dataset shows that ebullition during ice cover is regulated by atmospheric pressure variations; the stable bottom-water temperature has on correlation with the ebullition. The dataset also shows that turbidity at depth in the lake increases during ebullition events.</p>

【摘要】
湖泊沉积物甲烷冒泡排放（ebullition）是大气甲烷的重要来源。既往研究表明，温度波动、水位变化、大气压力扰动以及风生流均可影响甲烷冒泡排放过程。然而，此类研究大多仅在无冰期开展，尽管全球季节性封冻湖泊数量众多，但冰期内的相关观测仍较为匮乏。
本数据集涵盖了加拿大阿尔伯塔省基地矿湖（Base Mine Lake，北纬57°1′，西经111°37′）封冻期内的高频甲烷冒泡强度数据、大气压力数据、底层水温数据以及浊度数据。本研究期间，该湖泊水位保持稳定；且因冰盖覆盖，风生流的影响可忽略不计。数据分析结果显示：封冻期的甲烷冒泡排放受大气压力波动调控；稳定的底层水温与甲烷冒泡排放无显著相关性；此外，甲烷冒泡排放事件发生时，湖泊深部浊度会出现升高现象。