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| Titel |
Simulation of CO2 concentrations using coupled (Eulerian/Lagrangian) model with global high resolution (1km x 1km) surface fluxes. |
| VerfasserIn |
Alexander Ganshin, Tomohiro Oda, Makoto Saito, Yuji Koyama, Vinu Valsala, Robert J. Andres, Ruslan Zhuravlev, Alexander Lukyanov, Shamil Maksyutov |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250037681
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| Zusammenfassung |
| We prepared and tested a high resolution flux set for simulations of the CO2 at the
observation points using combination of grid based Eulerian transport model running at
medium resolution of 2.5 degrees and a Lagrangian plume dispersion model that uses 1
degree resolution wind and surface fluxes at 1 km resolution. Several regional studies
already reported usefulness of coupled Eulerian/Lagrangian approach with 1-2 km
resolution fluxes and winds. Our work is aimed at extending this technique to the
global scale. Use of the 1km surface fluxes with lower resolution wind is justified
by observations that in relatively flat areas the wind field in well mixed daytime
conditions is dominated by large scale geostrophic motion most of the time and
spatial radius of correlation between meteorological parameters on the order of 50
to 100 km is commonly observed. To reduce memory and storage requirements
we propose several other simplifications. The gridded fossil fuel CO2 emission
inventory was developed at 1 km resolution on annual basis, applying a combination
of a country level fuel consumption statistics, a global power plant database, and
satellite-observed nightlight data. Seasonal variation of the emissions was simulated
with monthly varying factors on 1 x 1 degree grid derived from the 21 country
national monthly emissions available. The vegetation CO2 fluxes are simulated with a
terrestrial biospheric model VISIT at 0.5x0.5 degree resolution at daily time step
for each of 15 vegetation types potentially present in the vicinity. Then the fluxes
are interpolated to each 1 km pixel of the global vegetation map. Oceanic fluxes
simulated with 4D-Var assimilation system based on reanalyzed currents are remapped
to a regular 1x1 degree grid and extended to coastal area using 1 km resolution
land-ocean mask. To validate model performance we have compared the simulation
results with observations at continuous CO2 monitoring site at Hateruma, Japan.
Comparisons show that we get improvements with 1km resolution fluxes over simulation
with 50-100 km resolution fluxes within the same coupled modeling framework. |
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