Temperature explains the formation of a metalimnetic oxygen minimum in a deep mesotrophic lake

IF 2.7 3区 环境科学与生态学 Q1 LIMNOLOGY
C. McDonald, Mahta Naziri Saeed, D. Robertson, S. Prellwitz
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引用次数: 2

Abstract

ABSTRACT Green Lake, a deep mesotrophic lake located in a primarily agricultural watershed in central Wisconsin, USA, has experienced annual metalimnetic oxygen minima since the early 20th century. However, the severity of the phenomenon has increased over time, and late-summer dissolved oxygen (DO) concentrations have typically been <3 mg L−1 in recent years. In situ, high-frequency observations of oxygen depletion at multiple depths reveal that while DO consumption during stratification occurs most rapidly in the metalimnion, there is synchrony between DO time series extending into the hypolimnion. A biochemical oxygen demand-based modeling approach suggests that much of the relationship between water depth and respiration rates can be explained by differences in water temperature. The amount of labile organic matter present throughout the water column at the onset of stratification seems to be a primary determinant of the severity of the annual metalimnetic DO minimum in late summer. Productivity has increased in the lake as a result of increased nutrient loading and is the likely driver of the decrease in minimum DO concentrations. In addition, the onset and duration of stratification is an important factor in determining the severity of the DO minimum.
温度解释了深中营养湖泊中金属氮氧最低值的形成
绿湖是位于美国威斯康辛州中部主要农业流域的一个深层中营养型湖泊,自20世纪初以来每年都经历着金属氧极小期。然而,这种现象的严重性随着时间的推移而增加,近年来夏末溶解氧(DO)浓度通常<3 mg L−1。在原位,对多个深度的氧气消耗的高频观测表明,虽然分层期间的DO消耗在金属离子中发生得最快,但在延伸到低氮离子的DO时间序列之间存在同步。一种基于生化需氧量的建模方法表明,水深和呼吸速率之间的大部分关系可以用水温的差异来解释。在分层开始时,整个水柱中存在的活性有机物的数量似乎是夏末年元动力DO最小值严重程度的主要决定因素。由于养分负荷增加,湖泊的生产力提高了,这可能是最低DO浓度降低的驱动因素。此外,分层的开始和持续时间是确定DO最小值严重程度的重要因素。
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来源期刊
Inland Waters
Inland Waters LIMNOLOGY-MARINE & FRESHWATER BIOLOGY
CiteScore
6.10
自引率
9.70%
发文量
34
审稿时长
>12 weeks
期刊介绍: Inland Waters is the peer-reviewed, scholarly outlet for original papers that advance science within the framework of the International Society of Limnology (SIL). The journal promotes understanding of inland aquatic ecosystems and their management. Subject matter parallels the content of SIL Congresses, and submissions based on presentations are encouraged. All aspects of physical, chemical, and biological limnology are appropriate, as are papers on applied and regional limnology. The journal also aims to publish articles resulting from plenary lectures presented at SIL Congresses and occasional synthesis articles, as well as issues dedicated to a particular theme, specific water body, or aquatic ecosystem in a geographical area. Publication in the journal is not restricted to SIL members.
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