Substantial overnight reaeration by convective cooling discovered in pond ecosystems
Substantial overnight reaeration by convective cooling discovered in pond ecosystems
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DOI：
10.1002/2016gl070206
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发表时间：
2016-08-16
影响因子：
5.2
通讯作者：
Raymond, Peter A.
中科院分区：
文献类型：
--
作者：
Holgerson, Meredith A.;Zappa, Christopher J.;Raymond, Peter A.
淡水溶解氧（DO）的变化趋势反映了整个生态系统的特性，并影响生物的生存和行为。在这里，我们表明，小池塘有独特的氧气动态，不同于较大的湖泊。我们发现，池塘欠饱和的溶解氧经历了大幅增加的氧气浓度过夜。夜间增加溶解氧发生在45%的采样的夜晚，导致溶解氧饱和度增加12倍（22%饱和度）的平均。当池塘温度比空气温度高出至少1.8摄氏度时，以及当氧气水平较低时，氧气峰值可能会出现（
Trends in freshwater dissolved oxygen (DO) reflect whole-ecosystem properties and influence organismal survival and behavior. Here we show that small ponds have unique oxygen dynamics that differ from larger lakes. We discovered that ponds undersaturated in DO experienced substantial increases in oxygen concentration overnight. Nighttime increases in DO occurred on 45% of the nights sampled and resulted in DO saturation increasing 12-fold (22% saturation) on average. Oxygen spikes were likely to occur when ponds became at least 1.8 degrees C warmer than the air and later in the season when oxygen levels were low (