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| Titel |
Nitrous oxide in the North Atlantic Ocean |
| VerfasserIn |
S. Walter, H. W. Bange, U. Breitenbach, D. W. R. Wallace |
| 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 ; 3, no. 4 ; Nr. 3, no. 4 (2006-12-01), S.607-619 |
| Datensatznummer |
250001168
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| Publikation (Nr.) |
 copernicus.org/bg-3-607-2006.pdf |
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| Zusammenfassung |
| In order to get a comprehensive picture of the distribution of nitrous oxide
(N2O) in the North Atlantic Ocean, measurements of dissolved nitrous
oxide were made during three cruises in the tropical, subtropical and
cold-temperate North Atlantic Ocean in October/November 2002,
March/April 2004, and May 2002, respectively. To account for the history
of atmospheric N2O, we suggest a new depth-dependent calculation of
excess N2O (ΔN2O). N2O depth profiles showed
supersaturation throughout the water column with a distinct increasing trend
from the cold-temperate to the tropical region. Lowest nitrous oxide
concentrations, near equilibrium and with an average of 11.0±1.7 nmol
L−1, were found in the cold-temperate North Atlantic where the profiles
showed no clear maxima. Highest values up to 37.3 nmol L−1 occurred in
the tropical North Atlantic with clear maxima at approximately 400 m. A
positive correlation of nitrous oxide with nitrate, as well as excess
nitrous oxide with the apparent oxygen utilization (AOU), was only observed in the subtropical and tropical
regions. Therefore, we conclude that the formation of nitrous oxide via
nitrification occurs in the tropical region rather than in the
cold-temperate region of the North Atlantic Ocean |
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