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...
| Main Authors: | , , , |
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| Format: | Article in Journal/Newspaper |
| Language: | unknown |
| Published: |
Sage Publications
2003
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| Subjects: | |
| Online Access: | http://repository.ias.ac.in/52747/ http://hol.sagepub.com/content/13/5/701.short |
| 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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