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| Titel |
Following the N2O consumption in the oxygen minimum zone of the eastern South Pacific |
| VerfasserIn |
M. Cornejo, L. Farías |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 9, no. 8 ; Nr. 9, no. 8 (2012-08-21), S.3205-3212 |
| Datensatznummer |
250007243
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| Publikation (Nr.) |
 copernicus.org/bg-9-3205-2012.pdf |
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| Zusammenfassung |
| Oxygen minimum zones (OMZs), such as those found in the eastern South Pacific
(ESP), are the most important N2O sources in the global ocean relative
to their volume. N2O production is related to low O2 concentrations
and high primary productivity. However, when O2 is sufficiently low,
canonical denitrification takes place and N2O consumption can be
expected. N2O distribution in the ESP was analyzed over a wide
latitudinal and longitudinal range (from 5° to 30° S and from
71–76° to ~ 84° W) based on ~ 890 N2O
measurements. Intense N2O consumption, driving undersaturations as low
as 40%, was always associated with secondary NO2– accumulation
(SNM), a good indicator of suboxic/anoxic O2 levels. First, we explore
relationships between ΔN2O and O2 based on existing data of
denitrifying bacteria cultures and field observations. Given the
uncertainties in the O2 measurements, a second relationship between
ΔN2O and NO2– (> 0.75 μM) was established
for suboxic waters (O2 < 8 μM). We reproduced the apparent
N2O production (ΔN2O) along the OMZ in ESP with high
reliability (r2 = 0.73 p = 0.01). Our results will contribute to the
quantification of the N2O that is recycled in O2 deficient waters,
and improve the prediction of N2O behavior under future scenarios of OMZ
expansion and intensification. |
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