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Short-term and seasonal variability of oxygen fluxes at the sediment-water interface in a riverine lake

机译：河流湖泊沉积物-水界面氧气通量的短期和季节性变化

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摘要

In situ measurements of sediment-water oxygen fluxes conducted in a riverine lake during different seasons were analyzed with the aim of quantifying the combined effects of hydrodynamic forcing and seasonal changes in temperature on sediment oxygen uptake rate. Oxygen fluxes measured using the eddy correlation (EC) technique varied widely between -6.4 and -84 mmol m~(-2) day~(-1), while variations observed on hourly time scales were of comparable magnitude to seasonal variations. Oxygen fluxes were most strongly correlated to current speed in the benthic boundary layer and water depth, which both co-varied with discharge, temperature, and oxygen concentration. A direct correlation of measured fluxes with temperature and corresponding seasonal flux variations could not be observed. To explore the potential effect of temperature on oxygen fluxes, we applied a simplified analytical model, which couples the effect of hydrodynamic forcing with a temperature-dependent oxygen consumption rate within the sediment. The results suggest that the flux is a non-linear function of both variables and both can have comparable effects on the magnitude of the oxygen fluxes. The model confirms our observation that short-term variations of oxygen fluxes in response to hydrodynamic forcing can mask longer-term seasonal variations driven by temperature. The model further indicates that the magnitude and form of the temperature dependence of oxygen uptake and mineralization rates in freshwater sediments obtained from laboratory incubations can be strongly affected by flow conditions during incubations. We conclude that predictions of oxygen uptake and mineralization rates under changing climatic conditions should also take potential changes of flow conditions into account.
机译：分析了在不同季节在河湖中进行的沉积物-水氧通量的原位测量，目的是量化流体动力强迫和温度的季节变化对沉积物氧吸收率的综合影响。使用涡流相关（EC）技术测得的氧气通量在-6.4和-84 mmol m〜（-2）天〜（-1）之间变化很大，而每小时时间尺度上观察到的变化与季节性变化相当。氧气通量与底栖边界层中的水流速度和水深密切相关，二者均与流量，温度和氧气浓度有关。无法观测到测得的通量与温度和相应的季节性通量变化之间的直接关系。为了探索温度对氧通量的潜在影响，我们应用了简化的分析模型，该模型将流体动力强迫的影响与沉积物中温度相关的耗氧率相结合。结果表明，通量是两个变量的非线性函数，并且两者都可以对氧气通量的大小产生可比的影响。该模型证实了我们的观察结果，即响应流体动力强迫的氧气通量的短期变化可以掩盖由温度驱动的长期季节性变化。该模型还表明，从实验室培养获得的淡水沉积物中氧气吸收和矿化速率的温度依赖性的大小和形式可能会受到培养过程中流动条件的强烈影响。我们得出结论，在变化的气候条件下对氧气吸收和矿化速率的预测也应考虑到流动条件的潜在变化。

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  • 来源
    《Aquatic Sciences》 |2015年第2期|183-196|共14页
  • 作者

    Erni Murniati; Sebastian Geissler; Andreas Lorke;

  • 作者单位

    Institute for Environmental Sciences, University of Koblenz-Landau, Fortstr. 7, 76829 Landau, Germany;

    Institute for Environmental Sciences, University of Koblenz-Landau, Fortstr. 7, 76829 Landau, Germany;

    Institute for Environmental Sciences, University of Koblenz-Landau, Fortstr. 7, 76829 Landau, Germany;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Hydrodynamics; Oxygen flux; Riverine lakes; Sediment-water interface;

    机译：流体力学氧气通量滨河湖泊;沉积物-水界面;

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