extreme n2o accumulation in the coastal oxygen minimum zone off peru
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2016
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Abstract
Depth profiles of nitrous oxide (N2O) were measured during six cruises
to the upwelling area and oxygen minimum zone (OMZ) off Peru in 2009 and
2012/2013, covering both the coastal shelf region and the adjacent open
ocean. N2O profiles displayed a strong sensitivity towards oxygen
concentrations. Open ocean profiles with distances to the shelf break larger
than the first baroclinic Rossby radius of deformation showed a transition
from a broad maximum close to the Equator to a double-peak structure south
of 5° S where the oxygen minimum was more pronounced. Maximum
N2O concentrations in the open ocean were about 80 nM. A linear
relationship between ΔN2O and apparent oxygen utilization (AOU)
could be found for measurements within the upper oxycline, with a slope
similar to studies in other oceanic regions. In contrast, N2O profiles
close to the shelf revealed a much higher variability, and N2O
concentrations higher than 100 nM were often observed. The highest N2O
concentration measured at the shelf was ∼ 850 nM. Due to the
extremely sharp oxygen gradients at the shelf, N2O maxima occurred in
very shallow water depths of less than 50 m. In the coastal area, a linear
relationship between ΔN2O and AOU could not be observed as
extremely high ΔN2O values were scattered over the full range
of oxygen concentrations. The data points that showed the strongest
deviation from a linear ΔN2O ∕ AOU relationship also showed
signals of intense nitrogen loss. These results indicate that the coastal
upwelling at the Peruvian coast and the subsequent strong remineralization
in the water column causes conditions that lead to extreme N2O
accumulation, most likely due to the interplay of intense mixing and high
rates of remineralization which lead to a rapid switching of the OMZ waters
between anoxic and oxic conditions. This, in turn, could trigger incomplete
denitrification or pulses of increased nitrification with extreme N2O
production.
| Reference Key |
kock2016biogeosciencesextreme
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|---|---|
| Authors | ;A. Kock;D. L. Arévalo-Martínez;C. R. Löscher;H. W. Bange |
| Journal | tetrahedron letters |
| Year | 2016 |
| DOI |
10.5194/bg-13-827-2016
|
| URL | |
| Keywords |
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