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sup(234) Th scavenging and particle export fluxes from the upper 100 m of the Arabian Sea

DRS at CSIR-National Institute of Oceanography

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Title sup(234) Th scavenging and particle export fluxes from the upper 100 m of the Arabian Sea
 
Creator Sarin, M.M.
Rengarajan, R.
Ramaswamy, V.
 
Subject thorium isotopes
spatial variations
temporal variations
primary production
sediment traps
carbon
 
Description We have determined the particle scavenging rates, export fluxes of sup(234) Th and settling particles from the upper 100 m of the Arabian Sea as a part of the JGOFS (India) Programme. The spatial and temporal measurements made in the open ocean profiles reveal close similarities in the dissolved sup(234) Th: sup(238) U disequilibria, suggesting that the rates of particle-associated scavenging processes are generally uniform in the central Arabian Sea. The observed disequilibrium integrated for the upper 100 m yields a mean scavenging residence time of mu 30 days and a removal rate of mu 3400 dpm m sup(-2) d sup(-1) for sup(234) Th, from dissolved to particulate phases. The deficiency of total sup(234) Th (dissolved + particulate) relative to sup(238) U allows us to compute the vertical export flux of particulate sup(234) Th. The flux data for the upper 100 m show spatial variations with enhanced export fluxes centered around 22 degrees N 67 degrees E, a region characterized by higher rates of column primary productivity. Using the sup(234) Th export fluxes and the measured specific activity of sup(234) Th in the sediment traps, we have computed th eparticle and carbon fluxes at 100 m. These results reveal that the particle fluxes determined from sediment traps are systematically low and the estimated C export fluxes are grossly out of proportion with the column primary production.
 
Date 2009-01-21T10:54:05Z
2009-01-21T10:54:05Z
1996
 
Type Journal Article
 
Identifier Current Science, Vol.71; 888-893p.
http://drs.nio.org/drs/handle/2264/2223
 
Language en
 
Rights Copyright [1996]. 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 Current Science Association, Bangalore, India