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Oxygen demands of San Diego Trough sediments: an in situ study 1
Author(s) -
Smith K. L.
Publication year - 1974
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1974.19.6.0939
Subject(s) - trough (economics) , respiration , upwelling , environmental science , oxygen , sediment , total organic carbon , chemical oxygen demand , environmental chemistry , oceanography , in situ , compartmentalization (fire protection) , hydrology (agriculture) , geology , chemistry , biology , environmental engineering , botany , geomorphology , biochemistry , macroeconomics , organic chemistry , geotechnical engineering , wastewater , economics , enzyme
In situ total oxygen demand of San Diego Trough sediments measured at a depth of 1,230 m was 2.40 ± 0.10 ml O 2 m −2 hr −1 . Community respiration and chemical demand were 1.31 and 1.09 ml O 2 m −2 hr −1 and constituted 54.6 and 45.4% of the total demand. Compartmentalization of community respiration with antibiotic treatment yielded a “bacterial respiration” measurement of 0.21 ml O 2 m −2 hr −1 . Surface water enrichment due to seasonal upwelling over the San Diego Trough is manifested in the sediment carbon demands, which are significantly higher (3.5% of the estimated annual primary production) than demands at comparable depths in more oligotrophic areas.