Eddy correlation measurements of oxygen uptake in deep ocean sediments
Eddy correlation measurements of oxygen uptake in deep ocean sediments
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DOI：
10.4319/lom.2009.7.576
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发表时间：
2009-08-01
影响因子：
2.7
通讯作者：
Kitazato, Hiroshi
中科院分区：
文献类型：
--
作者：
Berg, Peter;Glud, Ronnie N.;Kitazato, Hiroshi
我们展示并比较了在日本相模湾1450米深的海洋站点，通过涡动相关技术、原位培养箱以及垂直沉积物微剖面所测定的小的氧气（O₂）沉积物 - 水通量。这三种方法所测得的平均氧气吸收量分别为1.62 ± 0.23（标准误差，n = 7）、1.65 ± 0.33（n = 2）和1.43 ± 0.15（n = 25）毫摩尔每平方米每天。涡动相关通量和培养箱通量之间非常吻合，这是对涡动相关技术的一种新的重要验证。它表明现今可用的涡动相关仪器是精确的，即使是非常小的海底氧气通量也能准确测定。产生涡流通量的垂直速度和氧气浓度的相关波动平均值分别为0.074厘米每秒和0.049微摩尔。后者仅占底层水59微摩尔平均氧气浓度的0.08%。需要注意的是，这些特定的波动是平均值，甚至记录到了更小的变化，并且这些变化也对涡流通量有贡献。我们的研究结果表明，对于测量即使是非常小的海底氧气通量，涡动相关技术也是传统通量方法极具吸引力的替代方法。
We present and compare small sediment-water fluxes of O-2 determined with the eddy correlation technique, with in situ chambers, and from vertical sediment microprofiles at a 1450 m deep-ocean site in Sagami Bay, Japan. The average O-2 uptake for the three approaches, respectively, was 1.62 +/- 0.23 (SE, n = 7), 1.65 +/- 0.33 (n = 2), and 1.43 +/- 0.15 (n = 25) mmol m(-2) d(-1). The very good agreement between the eddy correlation flux and the chamber flux serves as a new, important validation of the eddy correlation technique. It demonstrates that the eddy correlation instrumentation available today is precise and can resolve accurately even very small benthic O-2 fluxes. The correlated fluctuations in vertical velocity and O-2 concentration that give the eddy flux had average values of 0.074 cm s(-1) and 0.049 mu M. The latter represents only 0.08% of the 59 mu M mean O-2 concentration of the bottom water. Note that these specific fluctuations are average values, and that even smaller variations were recorded and contributed to the eddy flux. Our findings demonstrate that the eddy correlation technique is a highly attractive alternative to traditional flux methods for measuring even very small benthic O-2 fluxes.