Department of Geosciences 
M45 Guyot Hall 
Princeton University 
Princeton, NJ 08544

Phone: (609) 258-1432
E-Mail:

Ward Lab page Microbial Ecology/Environmental Microbiology at Princeton

Department of Geosciences, Guyot Hall 
ajayakum@princeton.edu, tel (609) 258-6294, fax (609) 258-0796 
 

POSITIONS HELD 
2002-present Research Staff Member, Department of Geosciences, Princeton University 
2000-2002 Post Doctoral Research Associate, Geosciences Department, Princeton University
1992-2000 Technical Officer, National Institute of Oceanography, Goa, India
1987-1992 Senior Technical Assistant, National Institute of Oceanography, Goa, India 
1982-1987 Junior Technical Assistant at National Institute of Oceanography, Goa, India

EDUCATION 
1999 Ph.D., Marine Science. Goa University, Goa, India 
1988 M.Sc., Tropical Coastal Management, University of Newcastle Upon Tyne, United Kingdom 
1987 M.Sc., Chemistry, Bombay University , India 
1980 B.Sc., Chemistry, Madras University, India

RESEARCH INTERESTS: 
Marine nitrogen cycling, especially within the oxygen minimum zones of the world oceans, and understanding the microbial processes in production of greenhouse gases.

CURRENT PROJECTS 
Diversity of nitrite reductase genes in the water column of the Arabian Sea
Estimating rates of nitrogen transformations in the oxygen minimum zone of Eastern Tropical North Pacific using a Matlab model

List of Publications
1. 1. Jayakumar, D.A., C. A. Francis, S. W. A. Naqvi, and B. B. Ward. Diversity of nitrite reductase genes (nirS) in the denitrifying water column of the coastal Arabian Sea . (in press, Aquatic Microbial Ecology)

2. Naqvi, S.W.A., V.V.S.S.Sarma and D.A. Jayakumar(2002). Carbon cycling in the northern Arabian Sea during the Northeast Monsoon: significance of salps. Marine Ecology Progress Series . 226, 35-44. 

3. D.A. JAYAKUMAR, S.W.A. NAQVI, P.V. NARVEKAR AND M.D. GEORGE. (2001) Methane in Coastal and Offshore Waters of the Arabian Sea. Mar. Chem. 74(1) 1-13.

4. NAQVI, S.W.A., D.A. JAYAKUMAR, P.V. NARVEKAR, H.NAIK, V.V.S.S.SARMA, W.D'SOUZA, S.JOSEPH and M.D. GEORGE (2000) Increased marine production of N2O due to intensifying anoxia on the Indian continental shelf. Nature 408: 346-349. 

5. Naqvi, S.W.A. and D.A. Jayakumar(2000). Ocean biogeochemistry and atmospheric composition: Significance of the Arabian Sea. Curr. Sci. 88,101-111.

6. NAQVI, S.W.A., T. YOSHINARI, J.A.BRANDES, A.H. DEVOL, D.A. JAYAKUMAR, P.V. NARVEKAR, M.A. ALTABET and L.A. CODISPOTI (1998). Nitrogen isotopic studies in the suboxic Arabian Sea. Proc. Indian Acad. Sci. (Earth & Planet Sci.), 107, 367-378.

7. BRANDES, J.A., A.H. DEVOL, T. YOSHINARI, D.A. JAYAKUMAR and S.W.A. NAQVI (1998) Isotopic composition of nitrate in the central Arabian Sea and eastern tropical North Pacific: a tracer for mixing and nitrogen cycles. Limnol. Oceanogr., 43, 1680-1689.

8. S.W.A. NAQVI, M.D. GEORGE, P.V. NARVEKAR, D.A. JAYAKUMAR, M.S. SHAILAJA, S. SARDESAI, V.V.S.S. SARMA, D.M. SHENOY, H. NAIK, P.A. MAHESHWARAN, K. KRISHNA KUMARI, G. RAJESH, A.K. SUDHIR, AND M.S. BINU (1998) Severe fish mortality associated with 'red tide' observed in the sea off Cochin: Curr. Sci. 75, 543-544.

9. NAQVI, S.W.A., T. YOSHINARI, D.A. JAYAKUMAR, M.A. ALTABET, P.V. NARVEKAR, A.H. DEVOL, J.A.BRANDES and L.A. CODISPOTI Contrasting 15N/14N and 18O/16O ratios in N2O in the Arabian Sea: Implications for its origin and atmospheric balance. Nature, 394, 462-464.

10. YOSHINARI, T., M.A. ALTABET, S.W.A NAQVI, L. CODISPOTI, A. JAYAKUMAR, M. KUHLAND and A. DEVOL (1997) Nitrogen and oxygen isotopic composition of N2O from suboxic waters of the eastern tropical North Pacific and the Arabian Sea - measurement by continuous-flow isotope ratio monitoring. Mar. Chem., 56, 253-264.

11. KUMAR, M.D., S.W.A. NAQVI, M.D. GEORGE and D.A. JAYAKUMAR(1996) A sink for atmospheric carbon dioxide in the northern Bay of Bengal. J. Geophys. Res., 101, 18121-18125.

12. KUMAR, M.D., S.W.A. NAQVI, D.A. JAYAKUMAR, M.D. GEORGE, P.V. NARVEKAR and S.N. DE SOUSA (1995) Carbon dioxide and nitrous oxide in the North Indian Ocean. Curr. Sci., 69, 672-678.

13. NAQVI, S.W.A., A. JAYAKUMAR, M. NAIR, M.D. GEORGE and M.D. KUMAR (1994) Nitrous oxide in the western Bay of Bengal. Mar. Chem., 47, 269-278.

14. GEORGE, M.D., M.D. KUMAR, S.W.A. NAQVI, S. BANERJEE, P.V. NARVEKAR, S.N. DE SOUSA AND A. JAYAKUMAR(1994) A study of the carbon dioxide system in the northern Indian Ocean during premonsoon. Mar. Chem., 47, 243-254.

15. RAO, C.K., S.W.A. NAQVI, M.D. KUMAR, S.J.D. VARAPRASAD, D.A. JAYAKUMAR, M.D. GEORGE and S.Y.S. SINGBAL (1994) Hydrochemistry of the Bay of Bengal: Possible reasons for a different water-column cycling of carbon and nitrogen from the Arabian Sea. Mar. Chem., 47, 279-290.

16.D.A. JAYAKUMAR. and A. RAJENDRAN (1990): Speciation of Iron and Manganese in the Sediments of Mandovi estuary. Proc. Intl. Symp Marine Pollution 1990, 205-227.

17.BARBARA E BROWN and A JAYAKUMAR (1990): Temporal and spatial variations in Iron concentrations of Tropical bivalves during a dredging event. Marine Pollution Bulletin 21, 118-123.

18.P.V. SHIRODKAR and D.A. JAYAKUMAR (1990): Nutrients and Dissolved oxygen in the upper 1000m in the Equatorial Western Indian Ocean. Indian Journal of Marine Sciences 9, 47-52. 

19.M.V.M. WAFAR, V.P. DEVASSY, G. SLAWYK, J. GOES, D.A. JAYAKUMAR and A. RAJENDRAN (1985): Nitrogen uptake by phytoplankton and zooxanthellae in a coral atoll. Proc. 5th Int. Coral Reef Congress, 6, 29-37.