Eddy correlation measurements of oxygen uptake in deep ocean sediments
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Eddy correlation measurements of oxygen uptake in deep ocean sediments. / Berg, P.; Glud, Ronnie Nøhr; Hume, A.; Stahl, H.; Oguri, K.; Meyer, V.; Kitazato, H.
In: Limnology and Oceanography: Methods, Vol. 7, 2010, p. 576-584.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Eddy correlation measurements of oxygen uptake in deep ocean sediments
AU - Berg, P.
AU - Glud, Ronnie Nøhr
AU - Hume, A.
AU - Stahl, H.
AU - Oguri, K.
AU - Meyer, V.
AU - Kitazato, H.
N1 - KeyWords Plus: SAGAMI BAY; IN-SITU; SURFACE SEDIMENTS; FLUX; JAPAN; BOUNDARY; DYNAMICS; WATER; SEA; O-2
PY - 2010
Y1 - 2010
N2 - Abstract: 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.
AB - Abstract: 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.
M3 - Journal article
VL - 7
SP - 576
EP - 584
JO - Limnology and Oceanography: Methods
JF - Limnology and Oceanography: Methods
SN - 1541-5856
ER -
ID: 16812342