nitrous oxide dynamics in low oxygen regions of the pacific: insights from the memento database
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ID: 162252
2012
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Abstract
The eastern tropical Pacific (ETP) is believed to be one of the largest marine sources of the greenhouse gas nitrous oxide (N<sub>2</sub>O). Future N<sub>2</sub>O emissions from the ETP are highly uncertain because oxygen minimum zones are expected to expand, affecting both regional production and consumption of N<sub>2</sub>O. Here we assess three primary uncertainties in how N<sub>2</sub>O may respond to changing O<sub>2</sub> levels: (1) the relationship between N<sub>2</sub>O production and O<sub>2</sub> (is it linear or exponential at low O<sub>2</sub> concentrations?), (2) the cutoff point at which net N<sub>2</sub>O production switches to net N<sub>2</sub>O consumption (uncertainties in this parameterisation can lead to differences in model ETP N<sub>2</sub>O concentrations of more than 20%), and (3) the rate of net N<sub>2</sub>O consumption at low O<sub>2</sub>. Based on the MEMENTO database, which is the largest N<sub>2</sub>O dataset currently available, we find that N<sub>2</sub>O production in the ETP increases linearly rather than exponentially with decreasing O<sub>2</sub>. Additionally, net N<sub>2</sub>O consumption switches to net N<sub>2</sub>O production at ~ 10 μM O<sub>2</sub>, a value in line with recent studies that suggest consumption occurs on a larger scale than previously thought. N<sub>2</sub>O consumption is on the order of 0.01–1 mmol N<sub>2</sub>O m<sup>−3</sup> yr<sup>−1</sup> in the Peru-Chile Undercurrent. Based on these findings, it appears that recent studies substantially overestimated N<sub>2</sub>O production in the ETP. In light of expected deoxygenation and the higher than previously expected point at which net N<sub>2</sub>O production switches to consumption, there is enough uncertainty in future N<sub>2</sub>O production that even the sign of future changes is still unclear.
| Reference Key |
zamora2012biogeosciencesnitrous
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|---|---|
| Authors | ;L. M. Zamora;A. Oschlies;H. W. Bange;K. B. Huebert;J. D. Craig;A. Kock;C. R. Löscher |
| Journal | tetrahedron letters |
| Year | 2012 |
| DOI |
10.5194/bg-9-5007-2012
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