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| Titel |
A greenhouse gas monitoring and modelling system for Switzerland: The CarboCount CH project |
| VerfasserIn |
Dominik Brunner, Nina Buchmann, Werner Eugster, Sonia Seneviratne, Edouard Davin, Nicolas Gruber, Markus Leuenberger, Isabelle Bey, Ines Bamberger, Stephan Henne, Yu Liu, Stefanos Mystakidis, Brian Oney, Anne Roches |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250099103
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| Publikation (Nr.) |
 EGU/EGU2014-14851.pdf |
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| Zusammenfassung |
| CarboCount CH is a collaborative project of six research institutes in Switzerland. It
investigates human-related emissions and natural exchange between the atmosphere and the
biosphere of the two most important long-lived greenhouse gases carbon dioxide (CO2) and
methane (CH4) at the regional scale with a special focus on Switzerland. For this
purpose, four new measurement sites have been established including a 210 m tall
tower at Beromünster, a water reservoir tower in flat terrain at Gimmiz, and two
mountain sites at Lägern (856 m a.s.l.) and Früebüel (977 m a.s.l.). All sites were
equipped with high-precision instruments for continuous measurements of CO2, CH4,
and partially CO. The continuous CO measurements as well as bi-weekly 14CO2
samples at the tall tower site help to distinguish between anthropogenic and biogenic
contributions to the observed CO2 concentrations. All data are transferred to the central
processing facility at Empa where the calibrated data are uploaded to a database and
made remotely accessible to all partners. The network is complemented by flux
measurements of the Swiss Fluxnet network and other existing sites with CO2 and/or CH4
measurements including the high altitude GAW site Jungfraujoch. The four CarboCount CH
sites have been operating reliably and almost continuously for more than one year
now.
For data interpretation and top-down flux estimation, two separate atmospheric
transport and inverse modeling systems are being developed within the project. The
first one uses the new tracer transport module of the regional numerical weather
prediction model COSMO together with an Ensemble Kalman filter scheme. The
second framework is based on backward simulations with the Lagrangian transport
model FLEXPART-COSMO. Anthropogenic a priori emissions are obtained from
newly developed high-resolution (500 m x 500 m) inventories of diurnally and
seasonally varying CO2 and CH4 emissions in Switzerland, merged with European and
global emission inventories. Atmosphere-biosphere exchange fluxes of CO2 are
simulated with the coupled system COSMO-CLM2, i.e. COSMO coupled to the
Community Land Model, a state-of-the-art land processes and biogeochemistry
model.
Here we present a general outline of the project, the setup of the measurement network
and of the different modeling components and inverse methods. We have performed transport
simulations for the first year of observations and calculated the contributions from
anthropogenic and biogenic sources/sinks upstream of the measurement sites. The generally
good agreement between simulated and measured concentrations underlines the high
quality of the transport simulations, but occasional deviations are pointing towards
weaknesses in both the emission inventories and in the simulated meteorology. The
CarboCount CH project provides an ideal test bed for future carbon monitoring
systems, to test the suitability of different types of monitoring stations, to analyze
the challenges of a heterogeneous landscape, and to identify critical modelling
components. |
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