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The Holocene, Vol. 13, No. 5, 701-713 (2003)
DOI: 10.1191/0959683603hl656rp
© 2003 SAGE Publications

Changes in surface productivity and subsurface denitrification during the Holocene: a multiproxy study from the eastern Arabian Sea

Rajesh Agnihotri

Physical Research Laboratory, Navrangapura, Ahmedabad 380 009, Gujarat, India; Biogeochemistry Department, Max Planck Institute for Chemistry, PO Box 3060, 55020 Mainz, Germany agni{at}mpch-mainz.mpg.de

S. K. Bhattacharya

M. M. Sarin

B. L.K. Somayajulu

Physical Research Laboratory, Navrangapura, Ahmedabad 380 009, Gujarat, India

Spatial and temporal variations in the intensity of subsurface denitrification in the water-column of the eastem Arabian Sea have been investigated using chemical and isotopic proxies. The data show a steady increase in the denitrification intensity from ~10 ka to ~2 ka BP, probably caused by changes in surface productivity fuelled by strengthening of upwelling (monsoonal intensity). In addition, changes in redox conditions and detrital material input are assessed using abundances of a suite of major and trace elements. The temporal variations in some of the monsoonal proxies are characterized by periodicities of ~1400 and ~700 years, similar to those reported in the South Asian (Chinese) monsoon and high-latitude climate (north Atlantic region).

Key Words: Monsoon • denitrification • surface productivity • upwelling • periodicities • trace elements • geochemistry • stable isotopes • Arabian Sea • Holocene


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