FN Archimer Export Format
PT J
TI An Assessment of the Precision and Confidence of Aquatic Eddy Correlation Measurements
BT 
AF DONIS, Daphne
   HOLTAPPELS, Moritz
   NOSS, Christian
   CATHALOT, Cecile
   HANCKE, Kasper
   POLSENAERE, Pierre
   WENZHOEFER, Frank
   LORKE, Andreas
   MEYSMAN, Filip J. R.
   GLUD, Ronnie N.
   MCGINNIS, Daniel F.
AS 1:1;2:2;3:3;4:4;5:5;6:6;7:1;8:3;9:7;10:8;11:9;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;
C1 HGF MPG Research Group for Deep-Sea Ecology and Technology, Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, and Max Planck Institute for Marine Microbiology, Bremen, Germany
   Department of Biogeochemistry, Max Planck Institute for Marine Microbiology, Bremen, Germany
   Institute for Environmental Sciences, University of Koblenz-Landau, Landau, Germany
   Royal Netherland Institute for Sea Research (NIOZ), Yerseke, Netherlands
   Nordic Center for Earth Evolution, Department of Biology, University of Southern Denmark, Odense, Denmark, and Greenland Climate Research Centre, Greenland Institute of Natural Resources, Nuuk, Greenland
   Department of Analytical, Environmental and Geo-Chemistry, Vrije Universiteit Brussel, Brussels, Belgium
   Royal Netherland Institute for Sea Research (NIOZ), Yerseke, Netherlands, and Department of Analytical, Environmental and Geo-Chemistry, Vrije Universiteit Brussel, Brussels, Belgium
   Nordic Center for Earth Evolution, Department of Biology, University of Southern Denmark, Odense, Denmark, and Greenland Climate Research Centre, Greenland Institute of Natural Resources, Nuuk, Greenland, and Arctic Research Centre, University of Aarhus, Aarhus, Denmark, and Scottish Marine Institute, Scottish Association for Marine Science, Oban, United Kingdom
   Nordic Center for Earth Evolution, Department of Biology, University of Southern Denmark, Odense, Denmark, and Department of Experimental Limnology, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Berlin, Germany
C2 INST A WEGENER, GERMANY
   MAX PLANCK INST, GERMANY
   UNIV KOBLENZ LANDAU, GERMANY
   INST SEA RESEARCH (NIOZ), NETHERLANDS
   UNIV SOUTHERN DENMARK, GREENLAND
   UNIV VRIJE BRUSSEL, BELGIUM
   INST SEA RESEARCH (NIOZ), BELGIUM
   UNIV AARHUS, UK
   UNIV SOUTHERN DENMARK, GERMANY
IF 2.159
TC 32
UR https://archimer.ifremer.fr/doc/00275/38577/37102.pdf
LA English
DT Article
DE ;Turbulence;Boundary layer;Fluxes;Instrumentation/sensors;Optimization;Experimental design
AB The quantification of benthic fluxes with the aquatic eddy correlation (EC) technique is based on simultaneous measurement of the current velocity and a targeted bottom water parameter (e.g., O2, temperature). High-frequency measurements (64 Hz) are performed at a single point above the seafloor using an acoustic Doppler velocimeter (ADV) and a fast-responding sensor. The advantages of aquatic EC technique are that 1) it is noninvasive, 2) it integrates fluxes over a large area, and 3) it accounts for in situ hydrodynamics. The aquatic EC has gained acceptance as a powerful technique; however, an accurate assessment of the errors introduced by the spatial alignment of velocity and water constituent measurements and by their different response times is still needed.  Here, this paper discusses uncertainties and biases in the data treatment based on oxygen EC flux measurements in a large-scale flume facility with well-constrained hydrodynamics. These observations are used to review data processing procedures and to recommend improved deployment methods, thus improving the precision, reliability, and confidence of EC measurements. Specifically, this study demonstrates that 1) the alignment of the time series based on maximum cross correlation improved the precision of EC flux estimations; 2) an oxygen sensor with a response time of <0.4 s facilitates accurate EC fluxes estimates in turbulence regimes corresponding to horizontal velocities < 11 cm s−1; and 3) the smallest possible distance (<1 cm) between the oxygen sensor and the ADV’s sampling volume is important for accurate EC flux estimates, especially when the flow direction is perpendicular to the sensor’s orientation.
PY 2015
SO Journal Of Atmospheric And Oceanic Technology
SN 0739-0572
PU American Meteorological Society
VL 32
IS 3
UT 000351230500018
BP 642
EP 655
DI 10.1175/JTECH-D-14-00089.1
ID 38577
ER

EF