Organic Bioprocess Dominates Oceanic Nitrogen Loss | September 7, 2009 Issue - Vol. 87 Issue 36 | Chemical & Engineering News
Volume 87 Issue 36 | p. 53 | Concentrates
Issue Date: September 7, 2009

Organic Bioprocess Dominates Oceanic Nitrogen Loss

Organic material, rather than inorganic, is the primary nitrogen source for a major microbial denitrification process in the Arabian Sea
Department: Science & Technology
Keywords: climate, Arabian Sea, nitrogen cycle, denitrification

A new study clarifies and solidifies the dominant role of a critical pathway of nitrogen loss in the Arabian Sea-a difficult-to-study process that has weighty implications for oceanic influence on climate. An international team led by Princeton University's Bess B. Ward studied denitrification, the process by which microbes convert organic nitrogen-containing material to N2 gas, which escapes from the ocean. Although denitrification had reigned as the major theory for oceanic N2 loss, in recent years scientists have discovered another process known as anammox in which autotrophic microbes generate N2 from inorganic materials. Some studies have suggested that anammox dominates, rather than denitrification. But the Princeton group examined samples from the Arabian Sea, an ocean where N2 losses are particularly heavy, and found that denitrification is responsible for up to 99% of N2 production, they report in Nature (2009, 461, 78). Understanding the details of the nitrogen cycle is essential for gauging how oceans respond to global-scale changes in temperature and CO2, note nitrogen-fixation specialists Maren Voss and Joseph P. Montoya in an essay accompanying the paper.

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