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| Titel |
Methane emission estimates at northern high latitudes for 2004-2014 from CarbonTracker Europe-CH4 |
| VerfasserIn |
Aki Tsuruta, Tuula Aalto, Leif Backman, Ingrid T. van der Laan-Luijkx, Maarten Krol, Sander Houweling, Renato Spahni, Sebastian Lienert, Edward Dlugokencky, Tuomas Laurila, Juha Hatakka, Doug Worthy, Motoki Sasakawa, Olli Peltola, Aleksateri Mauranen, Martin Heiman, Lena Kozlova, Andrew Crotwell, Wouter Peters |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250148970
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| Publikation (Nr.) |
 EGU/EGU2017-13279.pdf |
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| Zusammenfassung |
| Northern high latitudes (NHL) are covered by permafrost and peatlands, and store much of
global soil carbon. As global warming proceeds, methane (CH4) emissions from the Arctic
and northern boreal regions are assumed to increase due to thawing of permafrost and
shortening of soil freeze and snow cover periods. In addition, several large cities and
industrial areas including oil and gas fields also contribute significantly to CH4 emissions
from NHL. Together, both biospheric and anthropogenic activities contribute to changes in
atmospheric CH4, but current understanding is still insufficient to quantify their
contributions to the NHL and global CH4 budget. In this study, we present CH4
emission estimates for NHL for 2004-2014 from the CarbonTracker Europe-CH4
(CTE-CH4) data assimilation system. CTE-CH4 is based on ensemble Kalman filter, and
optimises biospheric and anthropogenic emissions simultaneously, constrained by
global atmospheric CH4 observations, which includes newly assimilated sites from
NHL. The inversion results show that the contribution from NHL to global CH4
emissions is higher than previously thought. Posterior total CH4 emissions from
50∘N-90∘N are higher than prior estimates mainly from the EDGAR v4.2 FT2010
inventory and LPX-Bern dyptop ecosystem model. Much of the increase from the
prior is found in anthropogenic emissions from central Russia, and in biospheric
emissions from both North American and Eurasian boreal regions. In addition,
the increase in the biospheric emissions resulted in stronger dependency of the
CH4 emissions to temperature than in prior, particularly in autumn. For northern
Europe, anthropogenic emissions are estimated to be smaller than the EDGAR
inventory, and the inversions suggest that the emission distribution may need to be
revised. |
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