Mesoscale circulations over complex terrain in the Valencia coastal region, 
Spain - Part 2: Modeling CO2 transport using idealized surface fluxes

Perez-Landa, G.; Ciais, P.; Gangoiti, G.; Palau, J. L.; Carrara, A.; Gioli, B.; Miglietta, F.; Schumacher, M.; Millan, M. M.; Sanz, M. J.

doi:10.5194/acp-7-1835-2007

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Mesoscale circulations over complex terrain in the Valencia coastal region, Spain - Part 2: Modeling CO₂ transport using idealized surface fluxes

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Schumacher, M.
Department Biogeochemical Systems, Prof. M. Heimann, Max Planck Institute for Biogeochemistry, Max Planck Society;

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Citation

Perez-Landa, G., Ciais, P., Gangoiti, G., Palau, J. L., Carrara, A., Gioli, B., et al. (2007). Mesoscale circulations over complex terrain in the Valencia coastal region, Spain - Part 2: Modeling CO₂ transport using idealized surface fluxes. Atmospheric Chemistry and Physics, 7(7), 1851-1868. doi:10.5194/acp-7-1835-2007.

Cite as: https://hdl.handle.net/11858/00-001M-0000-000E-D5AA-5

Abstract

Vertical profiles of CO₂ concentration were collected during an intensive summer campaign in a coastal complex-terrain region within the frame of the European Project RECAB ( Regional Assessment and Modelling of the Carbon Balance in Europe). The region presents marked diurnal mesoscale circulation patterns. These circulations result in a specific coupling between atmospherically transported CO₂ and its surface fluxes. To understand the effects of this interaction on the spatial variability of the observed CO₂ concentrations, we applied a high-resolution transport simulation to an idealized model of land biotic fluxes. The regional Net Ecosystem Exchange fluxes were extrapolated for different land-use classes by using a set of eddy-covariance measurements. The atmospheric transport model is a Lagrangian particle dispersion model, driven by a simulation of the RAMS mesoscale model. Our simulations were able to successfully reproduce some of the processes controlling the mesoscale transport of CO₂. A semi-quantitative comparison between simulations and data allowed us to characterize how the coupling between mesoscale transport and surface fluxes produced CO₂ spatial gradients in the domain. Temporal averages in the simulated CO₂ field show a covariance between flux and transport consisting of: 1) horizontally, a CO₂ deficit over land, mirrored by a CO₂ excess over the sea and 2) vertically, the prevalence of a mean CO₂ depletion between 500 and 2000 m, and a permanent build-up of CO₂ in the lower levels. [References: 35]