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We studied the isotopic composition of dissolved sulfide in the Black Sea water column during different seasons at a total of 15 stations spanning the entire basin. The isotopic composition of dissolved sulfide averaged over all depths varies between -42.0%% and -32.6%%, ave. -39.6+/-1.3%% (1σ) (118 data points). Seasonal and spatial (open sea vs. coastal stations) differences in the δ 34...
A budget for the sulfur cycle in the Black Sea is proposed which incorporates specific biogeochemical process rates. The average sulfide production in the water column is estimated to be 30-50Tgyr -1 , occurring essentially in the layer between 500 and 2000m. About 3.2-5.2Tg sulfide yr -1 form during sulfate reduction in surface sediments of the anoxic zone. Total sulfur...
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