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Fluxes of amino acids and hexosamines to the deep Arabian sea

DRS at CSIR-National Institute of Oceanography

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Title Fluxes of amino acids and hexosamines to the deep Arabian sea
 
Creator Haake, B.
Ittekkot, V.
Ramaswamy, V.
Nair, R.R.
Honjo, S.
 
Description Results of organic carbon, total nitrogen, amino acid and hexosamine of samples collected during time-series sediment trap in investigations in the Arabian Sea are presented. Samples were taken over a period of 1 1/2 years at two depths at each of three locations in the western, central and eastern part of the basin. Seasonal changes in amino acid contents and their spectral distributions show that degradation of organic matter in the water column is reduced during the monsoons, which are the high-flux periods in the western and central Arabian Sea. At the eastern site more degraded material of possibly recycled marine or terrestrial origin reaches the traps during the late summer peak fluxes. The results of hexosamine analyses suggest that bacterial biomass is relatively enriched on particles sinking in the water column and, to a larger extent, at the sediment-water interface. Decomposition between intermediate and deep water results in a loss of 30-40% of total organic carbon and more than 40% of amino acids. Comparison of the measured accumulation rates of organic carbon in sediment traps with those of organic carbon preserved in sediments show that more than 85% is lost before final burial in the sediments. Organic matter preservation in the Arabian Sea is higher than the average for the open ocean; this may be due to the abundance of refractory organic matter of recycled marine or terrestrial origin
 
Date 2009-05-08T12:03:49Z
2009-05-08T12:03:49Z
1992
 
Type Journal Article
 
Identifier Marine Chemistry, Vol.40; 291-314p.
http://drs.nio.org/drs/handle/2264/3071
 
Language en
 
Rights Copyright [1992]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher Elsevier