Browsing Institute's contributions by Author "Ward, B.B."
Now showing items 1-7 of 7
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Denitrification as the dominant nitrogen loss process in the Arabian Sea
Ward, B.B.; Devol, A.H.; Rich, J.J.; Chang, B.X.; Bulow, S.E.; Naik, H.; Pratihary, A.K.; Jayakumar, A. (Nature Publishing Group, 2009)Primary production in over half of the world’s oceans is limited by fixed nitrogen availability. The main loss term from the fixed nitrogen inventory is the production of dinitrogen gas (N sub(2)) by heterotrophic ... -
Denitrification exceeds anammox as a nitrogen loss pathway in the Arabian Sea oxygen minimum zone
Bulow, S.E.; Rich, J.J.; Naik, H.; Pratihary, A.K.; Ward, B.B. (Elsevier, 2010)The oxygen minimum zones (OMZs) of the world oceans are sites of enhanced anaerobic nitrogen transformations, such that the largest OMZ, the Arabian Sea, is responsible for 30-50% of the oceanic water column fixed N loss. ... -
Denitrifying bacterial community composition changes associated with stages of denitrification in oxygen minimum zones
Jayakumar, D.A.; O'Mullan, G.D.; Naqvi, S.W.A.; Ward, B.B. (Springer, 2009)Denitrification in the ocean is a major sink for fixed nitrogen in the global N budget, but the process is geographically restricted to a few oceanic regions, including three oceanic oxygen minimum zones (OMZ) and hemipelagic ... -
Distribution and relative quantification of key genes involved in fixed nitrogen loss from the Arabian Sea oxygen minimum zone
Jayakumar, A.; Naqvi, S.W.A.; Ward, B.B. (American Geophysical Union, 2009)The Arabian Sea (AS) oxygen minimum zone (OMZ) is one of the largest pelagic low-oxygen environments in the open ocean. It is responsible for the removal of up to 60 Tg of nitrogen annually, roughly an eighth of the global ... -
Diversity of nitrite reductase genes (nirS) in the denitrifying water column of the coastal Arabian Sea
Jayakumar, D.A.; Francis, C.A.; Naqvi, S.W.A.; Ward, B.B. (Inter-Research, 2004)Denitrification often occurs in the water column, underlying zones of intense productivity and decomposition in upwelling regions. In the denitrifying zone off the southwest coast of India, high concentrations of nitrite ... -
Organic carbon, and not copper, controls denitrification in oxygen minimum zones of the ocean
Ward, B.B.; Tuit, C.B.; Jayakumar, A.; Rich, J.J.; Moffett, J.; Naqvi, S.W.A. (Elsevier, 2008)Incubation experiments under trace metal clean conditions and ambient oxygen concentrations were used to investigate the response of microbial assemblages in oxygen minimum zones (OMZs) to additions of organic carbon and ... -
The effect of organic carbon on fixed nitrogen loss in the eastern tropical South Pacific and Arabian Sea oxygen deficient zones
Chang, B.X.; Rich, J.R.; Jayakumar, A.; Naik, H.; Pratihary, A.K.; Keil, R.G.; Ward, B.B.; Devol, A.H. (Association for the Sciences of Limnology and Oceanography, 2014)The three major oxygen deficient zones (ODZs) of the world oceans (eastern tropical North and South Pacific (ETNP and ETSP, respectively), and Arabian Sea (AS) host the vast majority of pelagic fixed nitrogen (N) loss and ...