Now showing items 1-16 of 16

    • Budgetary and biogeochemical implications of N sub(2)O isotope signatures in the Arabian Sea 

      Naqvi, S.W.A.; Yoshinari, T.; Jayakumar, D.A.; Altabet, M.A.; Narvekar, P.V.; Devols, A.H.; Brandes, J.A.; Codispoti, L.A. (Macmillan, 1998)
      Nitrous oxide (N sub(2)O) is an important greenhouse gas that also plays a role in the chemistry of stratospheric ozone depletion, but its atmospheric budget has yet to be well-quantified sup(1-5). However, multi-isotope ...
    • Carbon dioxide and nitrous oxide in the Arabian Sea 

      Naqvi, S.W.A.; Sengupta, R.; DileepKumar, M. (American Geophysical Union, 1993)
      This review concentrates on some aspects of biogeochemical cycling of carbon and nitrogen in the Arabian Sea with emphasis on the atmospheric fluxes of CO sub(2) and N sub(2)O. The Arabian Sea appears to serve as a net ...
    • Carbon dioxide and nitrous oxide in the North Indian Ocean 

      DileepKumar, M.; Naqvi, S.W.A.; Jayakumar, D.A.; George, M.D.; Narvekar, P.V.; DeSousa, S.N. (Current Science Association, Bangalore, India, 1995)
      The understanding of biogeochemical cycling of carbon dioxide and nitrous oxide in the oceans is essential for predicting the fate of anthropogenically emitted components. The North Indian Ocean, with its diverse regimes, ...
    • CO sub(2) and N sub(2) O fluxes from the northern Indian Ocean 

      Narvekar, P.V.; Naqvi, S.W.A.; DileepKumar, M. (Narosa, New Delhi (India), 1998)
      The CO sub(2) and N sub(2)O in the north Indian Ocean were measured and their fluxes were evaluated. Samples were collected from the Arabian Sea and the Bay of Bengal. The water samples were analysed for dissolved oxygen, ...
    • Contribution of N<sub>2</sub>O emissions to the atmosphere from Indian monsoonal estuaries 

      Rao, G.D.; Sarma, V.V.S.S. (International Meteorological Institute, 2013)
      Estuaries are known to contribute a significant amount of nitrous oxide (N<sub>2</sub>O) to the atmosphere; however, the contribution from the Indian estuaries is unknown. We made an attempt to estimate emissions of ...
    • Distribution and air–sea exchange of nitrous oxide in the coastal Bay of Bengal during peak discharge period (southwest monsoon) 

      Rao, G.D.; Rao, V.D.; Sarma, V.V.S.S. (Elsevier, 2013)
      In order to examine the impact of river discharge from the Indian subcontinent on the concentration and air–sea exchange of nitrous oxide (N sub(2)O) a study was conducted during peak discharge period in the coastal Bay ...
    • Increased marine production of N sub(2)O due to intensifying anoxia on the Indian continental shelf 

      Naqvi, S.W.A.; Jayakumar, D.A.; Narvekar, P.V.; Naik, H.; Sarma, V.V.S.S.; DeSouza, W.; Joseph, S.; George, M.D. (Macmillan, 2000)
      Eutrophication of surface waters and hypoxia in bottom waters has been increasing in many coastal areas, leading to very large depletions of marine life in the affected regions. These areas of high surface productivity and ...
    • Nitrogen and oxygen isotopic composition of N sub(2)O from suboxic waters of the eastern tropical North Pacific and the Arabian Sea - measurement by continuous-flow isotope-ratio monitoring 

      Yoshinari, T.; Altabet, M.A.; Naqvi, S.W.A.; Codispoti, L.; Jayakumar, D.A.; Kuhland, M.; Devol, A. (Elsevier, 1997)
      Nitrous oxide (N sub(2)O) is a trace gas that is increasing in the atmosphere. It contributes to the greenhouse effect and influence the global ozone distribution. Recent reports suggest that regions such as the Arabian ...
    • Nitrogen cycling in the suboxic waters of the Arabian Sea 

      Devol, A.H.; Naqvi, S.W.A.; Codispoti, L.A. (Springer, 2006)
      Arabian Sea contains one of the world's three large oxygen deficient zones (ODZ). Within the ODZ oxygen concentration is vanishingly small between about 200 and 800 m depth and in this depth interval denitrifications is ...
    • Nitrogen transformations as inferred from the activities of key enzymes in the Arabian Sea oxygen minimum zone 

      Shailaja, M.S.; Narvekar, P.V.; Alagarsamy, R.; Naqvi, S.W.A. (Elsevier, 2006)
      Vertical distributions of the potential activities of some key enzymes mediating nitrification and denitrification were investigated within the oxygen (O2) minimum zone of the Arabian Sea at a number of locations between ...
    • Nitrous oxide emissions from the Arabian Sea: A synthesis 

      Bange, H.W.; Andreae, M.O.; Lal, S.; Law, C.S.; Naqvi, S.W.A.; Patra, P.K.; Rixen, P.K.; Upstill-Goddard, R.C. (European Geophysical Society, 2001)
      High-resolution (1 degree x 1 degree longitude) seasonal and annual nitrous oxide (N sub(2) O) concentration fields for the Arabian Sea surface layer using a database containing more than 2400 values measured between ...
    • Nitrous oxide in the western Bay of Bengal 

      Naqvi, S.W.A.; Jayakumar, D.A.; Nair, M.; DileepKumar, M.; George, M.D. (Elsevier, 1994)
      Extensive observations on nitrous oxide (N@d2@@O) in the atmosphere and waters of the western Bay of Bengal during March-April 1991 yield surface saturations and atmospheric fluxes ranging from 89.3 to 213.9% (mean 125.2%), ...
    • Seasonal and spatial variability in N sub(2)O distribution in the Arabian Sea 

      Patra, P.K.; Lal, S.; Venkataramani, S.; DeSousa, S.N.; Sarma, V.V.S.S.; Sardessai, S. (Pergamon, 1999)
      Extensive measurements of nitrous oxide (N sub(2)O) were made in the central and eastern Arabian Sea during the northeast monsoon (February-March), intermonsoon (April-May) and southwest monsoon (July-August) seasons. The ...
    • Seasonal oxygen deficiency over the western continental shelf of India 

      Naqvi, S.W.A.; Naik, H.; Jayakumar, D.A.; Shailaja, M.S.; Narvekar, P.V. (Springer, 2006)
      The North Indian Ocean contains about two-third of the global continental-margin area affected by natural oxygen deficiency (O2 less than 0.2 mL L sup(-1)) in the water column. Also, the littoral countries of this ...
    • The nitrogen cycle in the Arabian Sea 

      Bange, H.W.; Naqvi, S.W.A.; Codispoti, L.A. (Elsevier, 2005)
      Despite their importance for the global oceanic nitrogen (N) cycle, estimates of N fluxes in the Arabian Sea remain in considerable uncertainty. In this report, we summarize current knowledge of important processes, including ...
    • The oceanic fixed nitrogen and nitrous oxide budgets: Moving targets as we enter the anthropocene? 

      Codispoti, L.A.; Brandes, J.A.; Christensen, J.P.; Devol, A.H.; Naqvi, S.W.A.; Paerl, H.W.; Yoshinari, T. (Institut de Ciencies del Mar de Barcelona, 2001)
      New data forced to raise previous estimates of oceanic denitrification. The revised estimate of approx. 450 Tg N yr sup(-1) (Tg = 10 sup(12) g) produces an oceanic fixed N budget with a large deficit (approx. 200 Tg N yr ...