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Chemical oceanography of the Arabian Sea: Part III - Studies on nutrient fraction and stoichiometric relationship in the Northern and the Eastern Basins

DRS at CSIR-National Institute of Oceanography

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Title Chemical oceanography of the Arabian Sea: Part III - Studies on nutrient fraction and stoichiometric relationship in the Northern and the Eastern Basins
 
Creator SenGupta, R.
Sankaranarayanan, V.N.
DeSousa, S.N.
Fondekar, S.P.
 
Subject Chemistry and Biogeochemistry
water masses
vertical distribution
ocean basins
dissolved oxygen
nutrients (mineral)
chemical Oceanography
ISW, Arabian Sea
 
Description Phosphorus and inorganic nitrogen compounds have been divided into 'reserved' andoxidative fractions based on their relationships with apparent oxygen utilization in the northern and the north-eastern basins of the Arabian Sea.Two oxygen minima are observed in the water masses north of 20 degree N latitude.The reserved nitrogen compound is negative in the deeper waters and this varies from north to south. This deficit indicates a possible loss of nitrate to gaseous nitrogen through denitrification. Spatial variation of oxidative ratios indicates changes in the rates of nutrient regeneration associated mainly with regional variations in photosynthetic productivity. A stoichiometric relationship based on the ratios of change. of nutrients in water and their ratios of concentration in plankton indicates that organisms in the Arabian Sea may have an atomic relation for C :N :P of 105 :15:l. Applying the oxidative ratios the loss of nitratethrough denitrification has been calculated to be about 2/3 of its total availability. Similarity of conditions between this area and the eastern tropical North Pacific suggests denitrification as a characteristic on the eastern sides of oceans which are poorly ventilated in the north.
 
Date 1995-01-01T09:56:50Z
2017-09-29T13:47:03Z
1995-01-01T09:56:50Z
2017-09-29T13:47:03Z
1976
 
Type Journal Article
 
Identifier Indian Journal of Marine Sciences, vol.5; 1976; 58-71
0379-5136
http://drs.nio.org/drs/handle/2264/5492
 
Language en
 
Relation Indian J Mar Sci
SCI
 
Publisher CSIR-NISCAIR