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Sulfate reduction in Black Sea sediments: in situ and laboratory radiotracer measurements from the shelf to 2000m depth

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Sulfate reduction rate measurements by the (SO42-)-S-35 core injection method were carried out in situ with a benthic lander, LUISE, and in parallel by shipboard incubations in sediments of the Black Sea. Eight stations were studied along a transect from the Romanian shelf to the deep western anoxic basin. The highest rates measured on an areal basis for the upper 0-15 cm were 1.97 mmol m(-2) d(-1) on the shelf and 1.54 mmol m(-2) d(-1) at 181 m water depth just below the chemocline. At all stations sulfate reduction rates decreased to values 50% just above the chemocline to 100% just below. In the deep sea, mean sulfate reduction rates were 0.6 mmol m(-2) d(-1) corresponding to an organic carbon oxidation of 1.3 mmol m(-2) d(-1). This is close to the mean sedimentation rate-of organic carbon over the year in the western basin. A comparison with published data on sulfate reduction in Black Sea sediments showed that the present results tend to be higher in shelf sediments and lower in the deep-sea than most other data. Based on the present water column H2S inventory and the H2S flux out of the sediment, the calculated turnover time of H2S below the chemocline is 2100 years. (C) 2001 Elsevier Science Ltd. All rights reserved.
Bidragets oversatte titelSulfate reduction in Black Sea sediments: in situ and laboratory radiotracer measurements from the shelf to 2000m depth
OriginalsprogEngelsk
TidsskriftDeep-Sea Research Part I: Oceanographic Research Papers
Vol/bind48
Nummer9
Sider (fra-til)2073-2096
Antal sider24
ISSN0967-0637
StatusUdgivet - 1 sep. 2001

Bibliografisk note

PT: J; UT: WOS:000169461200005

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