Academic Journal
Validation of the Swiss methane emission inventory by atmospheric observations and inverse modelling
| العنوان: | Validation of the Swiss methane emission inventory by atmospheric observations and inverse modelling |
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| المؤلفون: | Henne, Stephan, Brunner, Dominik, Oney, Brian, Leuenberger, Markus, Eugster, Werner, Bamberger, Ines, Meinhardt, Frank, Steinbacher, Martin, Emmenegger, Lukas |
| المصدر: | eISSN: 1680-7324 |
| سنة النشر: | 2018 |
| المجموعة: | Copernicus Publications: E-Journals |
| الوصف: | Atmospheric inverse modelling has the potential to provide observation-based estimates of greenhouse gas emissions at the country scale, thereby allowing for an independent validation of national emission inventories. Here, we present a regional-scale inverse modelling study to quantify the emissions of methane (CH 4 ) from Switzerland, making use of the newly established CarboCount-CH measurement network and a high-resolution Lagrangian transport model. In our reference inversion, prior emissions were taken from the "bottom-up" Swiss Greenhouse Gas Inventory (SGHGI) as published by the Swiss Federal Office for the Environment in 2014 for the year 2012. Overall we estimate national CH 4 emissions to be 196 ± 18 Gg yr −1 for the year 2013 (1 σ uncertainty). This result is in close agreement with the recently revised SGHGI estimate of 206 ± 33 Gg yr −1 as reported in 2015 for the year 2012. Results from sensitivity inversions using alternative prior emissions, uncertainty covariance settings, large-scale background mole fractions, two different inverse algorithms (Bayesian and extended Kalman filter), and two different transport models confirm the robustness and independent character of our estimate. According to the latest SGHGI estimate the main CH 4 source categories in Switzerland are agriculture (78 %), waste handling (15 %) and natural gas distribution and combustion (6 %). The spatial distribution and seasonal variability of our posterior emissions suggest an overestimation of agricultural CH 4 emissions by 10 to 20 % in the most recent SGHGI, which is likely due to an overestimation of emissions from manure handling. Urban areas do not appear as emission hotspots in our posterior results, suggesting that leakages from natural gas distribution are only a minor source of CH 4 in Switzerland. This is consistent with rather low emissions of 8.4 Gg yr −1 reported by the SGHGI but inconsistent with the much higher value of 32 Gg yr −1 implied by the EDGARv4.2 inventory for this sector. Increased CH 4 emissions ... |
| نوع الوثيقة: | text |
| وصف الملف: | application/pdf |
| اللغة: | English |
| Relation: | https://acp.copernicus.org/articles/16/3683/2016/ |
| DOI: | 10.5194/acp-16-3683-2016 |
| الاتاحة: | https://doi.org/10.5194/acp-16-3683-2016 https://acp.copernicus.org/articles/16/3683/2016/ |
| رقم الانضمام: | edsbas.28DB867F |
| قاعدة البيانات: | BASE |
| DOI: | 10.5194/acp-16-3683-2016 |
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