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| Titel |
TransCom N2O model inter-comparison – Part 2: Atmospheric inversion estimates of N2O emissions |
| VerfasserIn |
R. L. Thompson, K. Ishijima, E. Saikawa, M. Corazza, U. Karstens, P. K. Patra, P. Bergamaschi, F. Chevallier, E. Dlugokencky, R. G. Prinn, R. F. Weiss, S. O'Doherty, P. J. Fraser, L. P. Steele, P. B. Krummel, A. Vermeulen, Y. Tohjima, A. Jordan, L. Haszpra, M. Steinbacher, S. van der Laan, T. Aalto, F. Meinhardt, M. E. Popa, J. Moncrieff, P. Bousquet |
| 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. 12 ; Nr. 14, no. 12 (2014-06-23), S.6177-6194 |
| Datensatznummer |
250118827
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| Publikation (Nr.) |
 copernicus.org/acp-14-6177-2014.pdf |
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| Zusammenfassung |
| This study examines N2O emission estimates from five different atmospheric
inversion frameworks based on chemistry transport models (CTMs). The five
frameworks differ in the choice of CTM, meteorological data, prior
uncertainties and inversion method but use the same prior emissions and
observation data set. The posterior modelled atmospheric N2O mole
fractions are compared to observations to assess the performance of the
inversions and to help diagnose problems in the modelled transport.
Additionally, the mean emissions for 2006 to 2008 are compared in terms of
the spatial distribution and seasonality. Overall, there is a good agreement
among the inversions for the mean global total emission, which ranges from
16.1 to 18.7 TgN yr−1 and is consistent with previous estimates. Ocean
emissions represent between 31 and 38% of the global total compared to
widely varying previous estimates of 24 to 38%. Emissions from the
northern mid- to high latitudes are likely to be more important, with a
consistent shift in emissions from the tropics and subtropics to the mid- to
high latitudes in the Northern Hemisphere; the emission ratio for
0–30° N to 30–90° N ranges from 1.5 to 1.9 compared
with 2.9 to 3.0 in previous estimates. The largest discrepancies across
inversions are seen for the regions of South and East Asia and for tropical
and South America owing to the poor observational constraint for these areas
and to considerable differences in the modelled transport, especially
inter-hemispheric exchange rates and tropical convective mixing. Estimates of
the seasonal cycle in N2O emissions are also sensitive to errors in
modelled stratosphere-to-troposphere transport in the tropics and southern
extratropics. Overall, the results show a convergence in the global and
regional emissions compared to previous independent studies. |
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