Publikationstyp
Wissenschaftlicher Artikel
Erscheinungsjahr
2014
TransCom N2O model inter-comparison - Part 2: Atmospheric inversion estimates of N2O emissions
TransCom N2O model inter-comparison - Part 2: Atmospheric inversion estimates of N2O emissions
Autor:innen
Herausgeber
Quelle
Atmospheric Chemistry & Physics
14 (2014), H. 12, Seite 6177-6194
14 (2014), H. 12, Seite 6177-6194
Schlagwörter
Atmosphärenchemie, Emission, Distickstoffoxid
Forschungskennzahl (FKZ)
Verbundene Publikation
Zitation
TransCom N2O model inter-comparison - Part 2: Atmospheric inversion estimates of N2O emissions, 2014. Atmospheric Chemistry & Physics [online]. Bd. 14 (2014), H. 12, Seite 6177-6194. DOI 10.60810/openumwelt-1138. Verfügbar unter: https://openumwelt.de/handle/123456789/8711
Zusammenfassung englisch
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 yrg^'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.©Author(s) 2014. Quelle: http://www.scopus.com