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| Titel |
Nitrous oxide emissions 1999 to 2009 from a global atmospheric inversion |
| VerfasserIn |
R. L. Thompson, F. Chevallier, A. M. Crotwell, G. Dutton, R. L. Langenfelds, R. G. Prinn, R. F. Weiss, Y. Tohjima, T. Nakazawa, P. B. Krummel, L. P. Steele, P. Fraser, S. O'Doherty, K. Ishijima, S. Aoki |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 4 ; Nr. 14, no. 4 (2014-02-17), S.1801-1817 |
| Datensatznummer |
250118406
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| Publikation (Nr.) |
 copernicus.org/acp-14-1801-2014.pdf |
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| Zusammenfassung |
| N2O surface fluxes were estimated for 1999 to 2009 using a
time-dependent Bayesian inversion technique. Observations were drawn from 5
different networks, incorporating 59 surface sites and a number of ship-based
measurement series. To avoid biases in the inverted fluxes, the data were
adjusted to a common scale and scale offsets were included in the
optimization problem. The fluxes were calculated at the same resolution as
the transport model (3.75° longitude × 2.5° latitude)
and at monthly time resolution. Over the 11-year period, the global total
N2O source varied from 17.5 to 20.1 Tg a−1 N. Tropical and
subtropical land regions were found to consistently have the highest N2O
emissions, in particular in South Asia (20 ± 3% of global total),
South America (13 ± 4%) and Africa (19 ± 3%), while
emissions from temperate regions were smaller: Europe (6 ± 1%) and
North America (7 ± 2%). A significant multi-annual trend in
N2O emissions (0.045 Tg a−2 N) from South Asia was found and
confirms inventory estimates of this trend. Considerable interannual
variability in the global N2O source was observed (0.8 Tg a−1 N,
1 standard deviation, SD) and was largely driven by variability in tropical
and subtropical soil fluxes, in particular in South America
(0.3 Tg a−1 N, 1 SD) and Africa (0.3 Tg a−1 N, 1 SD).
Notable variability was also found for N2O fluxes in the tropical and
southern oceans (0.15 and 0.2 Tg a−1 N, 1 SD, respectively).
Interannual variability in the N2O source shows some correlation with
the El Niño–Southern Oscillation (ENSO), where El Niño conditions
are associated with lower N2O fluxes from soils and from the ocean and
vice versa for La Niña conditions. |
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