CiTTyCAT chemistry forecasts for NAMBLEX
CiTTyCAT chemistry forecasts for NAMBLEX
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NAMBLEX (North Atlantic Marine Boundary Layer EXperiment) is a major
field experiment taking place in Mace Head, on the western coast of
Ireland during summer 2002. The experiment's aims are to investigate
the chemical composition and aerosol properties of the wide range of
air mass types arriving at the surface site. This page gives chemical forecast data derived from a chemical box model which follows a trajectory through the atmosphere, arriving at Mace Head at a given time. The evolution of chemistry in the box is modelled as it follows the trajectory in 3D space, picking up surface emissions and depositing species as the box enters the atmospheric boundary layer. The trajectories are first calculated using ECMWF forecast winds, and the chemical model is then run separately. This modelling technique has shown past success in capturing the variability of chemical composition associated with the origin of air masses arriving at the surface site. The forecasts are derived for a cluster of seven trajectories arriving at Mace Head in an octahedral configuration, about a central arrival point. Chemical concentrations are given as a mean of the cluster values at arrival, along with the standard deviation and maximum and minimum to give an indication of the chemical coherence of the air masses about the cluster.
For further information contact:
sra@env.leeds.ac.uk |
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