Citation

Bhushan R, Dutta K, Somayajulu BL. J. Environ. Radioact. 2008; 99(10): 1566-1571.

Affiliation

Planetary & Geosciences Division, Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, India. bhushan@prl.res.in

Copyright

(Copyright © 2008, Elsevier Publishing)

DOI

10.1016/j.jenvrad.2007.12.006

PMID

18258344

Abstract

Radiocarbon measurements were made in the water column of the Arabian Sea and the equatorial Indian Ocean during 1994, 1995 and 1997 to assess the temporal variations in bomb 14C distribution and its inventory in the region with respect to GEOSECS measurements made during 1977-1978. Four GEOSECS stations were reoccupied (three in the Arabian Sea and one in the equatorial Indian Ocean) during this study, with all of them showing increased penetration of bomb 14C along with decrease in its surface water activity. The upwelling rates derived by model simulation of bomb 14C depth profile using the calculated exchange rates ranged from 3 to 9 m a(-1). The western region of the Arabian Sea experiencing high wind-induced upwelling has higher estimated upwelling rates. However, lower upwelling rates obtained for the stations occupied during this study could be due to reduced 14C gradient compared to that during GEOSECS.

Language: en