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Vulnerability of a large monomictic lake (Lake Biwa) to warm winter event

机译：大型单体湖（琵琶湖）在冬季暖风中的脆弱性

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Detailed cross-sectional temperature and oxygen distributions during winter were examined over 5 years (2003-2007) in large, warm, monomictic Lake Biwa. The distribution patterns showed year-to-year variation in the degree of spatial heterogeneity and indicated that both convective mixing and gravity currents contributed to the delivery of oxygen to the profundal zone. We encountered a warm winter in 2007, when deep-water oxygenation was delayed by more than a month relative to normal years. Data obtained during the period of oxygenation in 2007 suggest that the timing of complete oxygenation of the bottom water (or lower layers of the hypolimnion) was controlled by physical processes responsible for destruction of the weak thermal stratification near the bottom. This study revealed that Lake Biwa is sensitive to year-to-year variations in winter meteorological conditions. Specifically, the bottom environments are highly susceptible to a warm winter, especially when it follows a cold winter.
机译：在5年（2003年至2007年）期间，对大型，温暖，单体的琵琶湖冬季的详细横截面温度和氧气分布进行了检查。分布模式显示了空间异质性程度的逐年变化，并表明对流混合和重力流都有助于向底区输送氧气。我们在2007年遇到了一个温暖的冬天，当时深水氧化作用比正常年份延迟了一个多月。在2007年充氧期间获得的数据表明，对底部水（或次层低层的下层）进行完全充氧的时机是由破坏底部附近弱热分层的物理过程控制的。这项研究表明，琵琶湖对冬季气象条件的逐年变化敏感。特别是，底部环境对温暖的冬天特别是寒冷的冬天非常敏感。

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