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  Inverse modelling of European N2O emissions: assimilating observations from different networks

Corazza, M., Bergamaschi, P., Vermeulen, A. T., Aalto, T., Haszpra, L., Meinhardt, F., et al. (2011). Inverse modelling of European N2O emissions: assimilating observations from different networks. Atmospheric Chemistry and Physics, 11(5), 2381-2398. doi:10.5194/acp-11-2381-2011.

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 Creators:
Corazza, M., Author
Bergamaschi, P., Author
Vermeulen, A. T., Author
Aalto, T., Author
Haszpra, L., Author
Meinhardt, F., Author
O'doherty, S., Author
Thompson, R., Author
Moncrieff, J., Author
Popa, E., Author
Steinbacher, M., Author
Jordan, Armin1, Author           
Dlugokencky, E., Author
Brühl, C., Author
Krol, M., Author
Dentener, F., Author
Affiliations:
1Service Facility Gas Analytical Laboratory, Dr. A. Jordan, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_2068299              

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Free keywords: nitrous-oxide atmospheric methane ozone gases
 Abstract: We describe the setup and first results of an inverse modelling system for atmospheric N2O, based on a four-dimensional variational (4DVAR) technique and the atmospheric transport zoom model TM5. We focus in this study on the European domain, utilizing a comprehensive set of quasi-continuous measurements over Europe, complemented by N2O measurements from the Earth System Research Laboratory of the National Oceanic and Atmospheric Administration (NOAA/ESRL) cooperative global air sampling network. Despite ongoing measurement comparisons among networks parallel measurements at a limited number of stations show that significant offsets exist among the different laboratories. Since the spatial gradients of N2O mixing ratios are of the same order of magnitude as these biases, the direct use of these biased datasets would lead to significant errors in the derived emissions. Therefore, in order to also use measurements with unknown offsets, a new bias correction scheme has been implemented within the TM5-4DVAR inverse modelling system, thus allowing the simultaneous assimilation of observations from different networks. The N2O bias corrections determined in the TM5-4DVAR system agree within similar to 0.1 ppb (dry-air mole fraction) with the bias derived from the measurements at monitoring stations where parallel NOAA discrete air samples are available. The N2O emissions derived for the northwest European and east European countries for 2006 show good agreement with the bottom-up emission inventories reported to the United Nations Framework Convention on Climate Change (UNFCCC). Moreover, the inverse model can significantly narrow the uncertainty range reported in N2O emission inventories for these countries, while the lack of measurements does not allow to reduce the uncertainties of emission estimates in southern Europe. Several sensitivity experiments were performed to test the robustness of the results. It is shown that also inversions without detailed a priori spatio-temporal emission distributions are capable to reproduce major regional emission patterns within the footprint of the existing atmospheric network, demonstrating the strong constraints of the atmospheric observations on the derived emissions.

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Language(s): eng - English
 Dates: 2011
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.5194/acp-11-2381-2011
ISI: ://000288368900031
Other: BGC1445
 Degree: -

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Title: Atmospheric Chemistry and Physics
Source Genre: Journal
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Publ. Info: Katlenburg-Lindau, Germany : European Geosciences Union
Pages: - Volume / Issue: 11 (5) Sequence Number: - Start / End Page: 2381 - 2398 Identifier: CoNE: https://pure.mpg.de/cone/journals/resource/111030403014016
ISSN: 1680-7316