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Title:
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Regional scale modelling of meteorology and CO2 for the Cabauw tall tower, The Netherlands
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Author(s):
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Tolk, L.F. ; Peters, W. ; Meesters, A.G.C.A. ; Groenendijk, M.; Vermeulen, A.T.; Steeneveld, G.J.; Dolman, A.J.
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Published by:
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Publication date:
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ECN
Biomass, Coal and Environmental Research
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22-6-2009
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ECN report number:
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Document type:
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ECN-W--09-016
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Article (scientific)
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Number of pages:
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22
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Published in: Biogeosciences Discussions (Copernicus Publications), , , Vol., p.-.
Abstract:
We simulated meteorology and atmospheric CO2 transport over the Netherlands with the mesoscale model RAMS-Leaf3 coupled to the biospheric CO2 flux model 5PM. The results were compared with meteorological and CO2 observations, with particular attention to the tall tower of Cabauw. An analysis of the coupled exchange of energy, moisture and CO2 showed that the surface fluxes in the domain strongly influenced the atmospheric properties. The majority of the variability in the afternoon CO2 mixing ratio in the middle of the domain was determined by biospheric and fossil fuel CO2 fluxes in the limited area domain (640×640 km). Variation of the surface CO2 fluxes, reflecting the uncertainty of the parameters in the CO2 flux model 5PM, resulted in a range of simulated atmospheric CO2 mixing ratios of about 12 ppm in the well-mixed boundary layer. Additionally, we identified an uncertainty in the surface energy fluxes. The spread caused by this uncertainty in the simulated atmospheric vertical mixing caused a CO2 transport error of 1.7 ppm. This is an important source of uncertainty and should be accounted for to avoid biased estimates of the CO2 mixing ratio, but does not overwhelm the signal in the CO2 mixing ratio due to the spread in CO2 surface fluxes.
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