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| Titel |
A comparison of top-down and bottom-up carbon dioxide fluxes in the UK using
a multi-platform measurement network. |
| VerfasserIn |
Emily White, Matt Rigby, Simon O'Doherty, Ann Stavert, Mark Lunt, Eiko Nemitz, Carole Helfter, Grant Allen, Joe Pitt, Stephane Bauguitte, Pete Levy, Marcel van Oijen, Mat Williams, Luke Smallman, Paul Palmer |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250127640
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| Publikation (Nr.) |
 EGU/EGU2016-7537.pdf |
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| Zusammenfassung |
| Having a comprehensive understanding, on a countrywide scale, of both biogenic and
anthropogenic CO2 emissions is essential for knowing how best to reduce anthropogenic
emissions and for understanding how the terrestrial biosphere is responding to global fossil
fuel emissions. Whilst anthropogenic CO2 flux estimates are fairly well constrained, fluxes
from biogenic sources are not. This work will help to verify existing anthropogenic
emissions inventories and give a better understanding of biosphere - atmosphere CO2
exchange.
Using an innovative top-down inversion scheme; a hierarchical Bayesian Markov Chain
Monte Carlo approach with reversible jump “trans-dimensional” basis function
selection, we aim to find emissions estimates for biogenic and anthropogenic sources
simultaneously. Our approach allows flux uncertainties to be derived more comprehensively
than previous methods, and allows the resolved spatial scales in the solution to be
determined using the data. We use atmospheric CO2 mole fraction data from the UK
Deriving Emissions related to Climate Change (DECC) and Greenhouse gAs UK and
Global Emissions (GAUGE) projects. The network comprises of 6 tall tower sites,
flight campaigns and a ferry transect along the east coast, and enables us to derive
high-resolution monthly flux estimates across the UK and Ireland for the period
2013-2015.
We have derived UK total fluxes of 675
PIC
78 Tg/yr during January 2014 (seasonal maximum) and 23
PIC
96 Tg/yr during May 2014 (seasonal minimum). Our disaggregated anthropogenic and
biogenic flux estimates are compared to a new high-resolution time resolved anthropogenic
inventory that will underpin future UNFCCC reports by the UK, and to DALEC carbon cycle
model. This allows us to identify where significant differences exist between these
“bottom-up” and “top-down” flux estimates and suggest reasons for discrepancies. We
will highlight the strengths and limitations of the UK’s CO2 emissions verification
infrastructure at present and outline improvements that could be made in the future. |
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