Application of Oxygen Eddy Correlation in Aquatic Systems
Lorrai, Claudia, McGinnis, Daniel, Berg, Peter, Brand, Andreas and Wüest, Alfred (2010) Application of Oxygen Eddy Correlation in Aquatic Systems Journal of Atmospheric and Oceanic Technology, 27 (9). pp. 1533-1546. DOI 10.1175/2010JTECHO723.1.
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The eddy correlation technique is rapidly becoming an established method for resolving dissolved oxygen
fluxes in natural aquatic systems. This direct and noninvasive determination of oxygen fluxes close to the
sediment by simultaneously measuring the velocity and the dissolved oxygen fluctuations has considerable
advantages compared to traditional methods. This paper describes the measurement principle and analyzes
the spatial and temporal scales of those fluctuations as a function of turbulence levels. The magnitudes and
spectral structure of the expected fluctuations provide the required sensor specifications and define practical
boundary conditions for the eddy correlation instrumentation and its deployment. In addition, data analysis
and spectral corrections are proposed for the usual nonideal conditions, such as the time shift between
the sensor pair and the limited frequency response of the oxygen sensor. The consistency of the eddy
correlation measurements in a riverine reservoir has been confirmed—observing a night–day transition
from oxygen respiration to net oxygen production, ranging from 220 to 15 mmol m22 day21—by
comparing two physically independent, eddy correlation instruments deployed side by side. The natural
variability of the fluctuations calls for at least ;1 h of flux data record to achieve a relative accuracy of better
than ;20%. Although various aspects still need improvement, eddy correlation is seen as a promising and
soon-to-be widely applied method in natural waters.
|Keywords:||Geochemistry; Eddy correlation, Oxygen flux, turbulence, benthic|
|Research affiliation:||OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems|
|Date Deposited:||05 Oct 2010 09:43|
|Last Modified:||06 Jul 2012 14:50|
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