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Can Hydrocarbons in Coastal Sediments be Related to Terrestrial Flux? A Case Study of Godavari River Discharge (Bay of Bengal)


Affiliations
1 Marine Chemistry Laboratory, Andhra University, Visakhapatnam 530 003, India
2 National Institute of Oceanography, Dona Paula, Goa 403 004, India
3 Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, India
 

A sediment core aged ~250 years and deposition rate of ~2.4 mm yr-1 raised from the coastal region receiving inputs from the Godavari river was examined for n-alkanes. The carbon preference index (CPI) of shortchain hydrocarbons (SHC) indicated intense bacterial activity. The long-chain hydrocarbons (LHC) were major and their CPI (CPILHC) indicated that the terrestrial source was more dominant compared to the in situ input. CPILHC is significantly linearly correlated and appears to be a proxy for the historical discharge of the river.

Keywords

Carbon Preference Index, Coastal Sediments, Hydrocarbons, Terrestrial Flux.
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  • Can Hydrocarbons in Coastal Sediments be Related to Terrestrial Flux? A Case Study of Godavari River Discharge (Bay of Bengal)

Abstract Views: 261  |  PDF Views: 92

Authors

Rayaprolu Kiran
Marine Chemistry Laboratory, Andhra University, Visakhapatnam 530 003, India
V. V. J. Gopala Krishna
Marine Chemistry Laboratory, Andhra University, Visakhapatnam 530 003, India
B. G. Naik
Marine Chemistry Laboratory, Andhra University, Visakhapatnam 530 003, India
G. Mahalakshmi
National Institute of Oceanography, Dona Paula, Goa 403 004, India
R. Rengarajan
Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, India
Aninda Mazumdar
National Institute of Oceanography, Dona Paula, Goa 403 004, India
Nittala S. Sarma
Marine Chemistry Laboratory, Andhra University, Visakhapatnam 530 003, India

Abstract


A sediment core aged ~250 years and deposition rate of ~2.4 mm yr-1 raised from the coastal region receiving inputs from the Godavari river was examined for n-alkanes. The carbon preference index (CPI) of shortchain hydrocarbons (SHC) indicated intense bacterial activity. The long-chain hydrocarbons (LHC) were major and their CPI (CPILHC) indicated that the terrestrial source was more dominant compared to the in situ input. CPILHC is significantly linearly correlated and appears to be a proxy for the historical discharge of the river.

Keywords


Carbon Preference Index, Coastal Sediments, Hydrocarbons, Terrestrial Flux.



DOI: https://doi.org/10.18520/cs%2Fv108%2Fi1%2F96-100