Measurements of eddy correlation oxygen fluxes in shallow freshwaters: Towards routine applications and analysis
Measurements of eddy correlation oxygen fluxes in shallow freshwaters: Towards routine applications and analysis
复制标题
浅层淡水中涡相关氧通量的测量：走向常规应用和分析
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
A. Wüest
中科院分区：
文献类型：
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作者：
D. McGinnis;P. Berg;A. Brand;Claudia Lorrai;Theresa J. Edmonds;A. Wüest
使用涡流相关技术测量浅层水库中的底栖溶解氧通量。通量变化描述了每日的生产-消耗周期，白天氧气的释放遵循太阳辐射趋势。夜间平均吸收量为−40 ± 11 mmol m−2 d−1，与沉积物氧微剖面得出的−35 ± 3 mmol m−2 d−1 速率非常一致。分离大规模平流和湍流脉动是通量计算的关键且不确定的组成部分，也是最大的误差源。为了补偿 2.25 秒的氧传感器响应时间，使用一阶光谱增强将氧通量计算仅校正约 5%。这项工作表明，只需稍快一点的氧气传感器即可解析整个通量谱。这 18 小时的数据是在淡水水库中获得的首次测量数据，捕获了昼夜氧气生产-消耗周期。
Benthic fluxes of dissolved oxygen are measured in a shallow reservoir using the eddy correlation technique. Flux variations depict the diurnal production‐consumption cycle, with daytime oxygen release following the solar radiation trend. The average nighttime uptake of −40 ± 11 mmol m−2 d−1 is in excellent agreement with the rate of −35 ± 3 mmol m−2 d−1 derived from sediment oxygen microprofiles. Separating large‐scale advective and turbulent fluctuations is a crucial and uncertain component of the flux computation and the largest source of error. To compensate for the 2.25 s oxygen sensor response time, the oxygen flux calculations are corrected by only ∼5% using a first‐order spectral enhancement. This work demonstrates that only a slightly faster oxygen sensor would be needed to resolve the entire flux spectrum. The 18 hours of data are the first measurements obtained in a freshwater reservoir that capture the diurnal oxygen production‐consumption cycle.