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Organic matter composition in sediments of the Oman margin

DRS at CSIR-National Institute of Oceanography

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Title Organic matter composition in sediments of the Oman margin
 
Creator Alagarsamy, R.
 
Subject sediment chemistry
sediment composition
organic matter
amino acids
carbohydrates
carbon
nitrogen
oxygen minimum layer
biochemical composition
 
Description The quantity and biochemical composition of organic matter (OM) in the sediments underlying and below oxygen minimum zone (OMZ) in the Arabian Sea were studied to provide information on the diagenetic processes of organic carbon under different environmental conditions. Concentrations of total organic carbon (TOC), total nitrogen (TN) and total hydrolysable amino acids (THAA) were significantly higher is sediments within rather than below OMZ, while those of total carbohydrates (TCHO) were slightly lower in the latter, suggesting the presence of a larger supply of labile compounds into the sea bottom at the shallower site (i.e. within OMZ). Hydrolysable amino acid and carbohydrate contribution to TOC were even lower (about 10% in surficial sediments) than the values obtained from the abyssal oligotrophic North Pacific, suggesting that OM food availability in the Oman Margin sediments within OMZ was lower than that observed at abyssal depths. The presence of the highest THAA and TCHO concentrations in the top 40 mm of the sediment core at both sites reflected the presence of bioturbation processes. In contrast with the general view of the deep sea as a stable and constant system, below OMZ in the Arabian Sea sediments, some differences were observed in the two investigated cores indicating the presence of a certain spatial variability in OM content and diagenesis
 
Date 2008-07-18T05:08:37Z
2008-07-18T05:08:37Z
2003
 
Type Journal Article
 
Identifier Chemistry and Ecology, Vol.19; 419-429p.
http://drs.nio.org/drs/handle/2264/1224
 
Language en
 
Rights Copyright [2003]. It is tried to respect the rights of the copyright holders to the best of the knowledge. If it is brought to our notice that the rights are violated then the item would be withdrawn.
 
Publisher Taylor and Francis