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

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 change...

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Bibliographic Details
Published in:The Holocene
Main Authors: Agnihotri, Rajesh, Bhattacharya, S. K., Sarin, M. M., Somayajulu, B. L.K.
Format: Article in Journal/Newspaper
Language:English
Published: SAGE Publications 2003
Subjects:
Paleontology
Earth-Surface Processes
Ecology
Archeology
Global and Planetary Change
North Atlantic
Online Access:http://dx.doi.org/10.1191/0959683603hl656rp
http://journals.sagepub.com/doi/pdf/10.1191/0959683603hl656rp
Description
Summary: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).

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