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Eddy correlation measurements of oxygen uptake in deep ocean sediments
Author(s) -
Berg Peter,
Glud Ronnie N.,
Hume Andrew,
Stahl Henrik,
Oguri Kazumasa,
Meyer Volker,
Kitazato Hiroshi
Publication year - 2009
Publication title -
limnology and oceanography: methods
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.898
H-Index - 72
ISSN - 1541-5856
DOI - 10.4319/lom.2009.7.576
Subject(s) - eddy covariance , flux (metallurgy) , benthic zone , sediment , eddy current , bay , atmospheric sciences , environmental science , geology , chemistry , oceanography , physics , geomorphology , ecosystem , ecology , organic chemistry , biology , quantum mechanics
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 µM. The latter represents only 0.08% of the 59 µM 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.