Effect of zonal averaging on modelled tropospheric compounds on northern mid latitudes
article
The effect of zonal averaging of modelled concentrations of ozone, NO,, PAN, propene and OH in the 30°-60°N zonal band are investigated for summerly conditions. There for results are compared of one-dimensional model runs for the 30°-60°N zonal band under zonally averaged conditions and alternating continental-oceanic conditions. The following conditions are modelled alternating: emissions, vertical transport, dry deposition and the temperature profile. Correlations in the processes of the alternating conditions and in the different chemica! regimes determine the overall effect of zonal averaging on the con centrations. In many cases the effects of a correlation in one process is found to be (partly) counteracted by the effects of a correlation in one of the other processes. We calculate in a baserun that the effect of zonal averaging on ozone, and OH concentrations are relatively small (less than 10% zonal deviation), whereas PAN, NO,, and propene concentrations may be considerably over estimated by zonally averaging (up to 50% zonal deviation). Sensitivity studies indicate that under certain conditions ozone and OH concentrations may be more affected by zonal averaging. Moreover, the magnitude of the effect of zonal averaging is found to be most sensitive to zonal inhomogeneity of the temperature profile, the NO, emission and transport in the planetary boundary layer
TNO Identifier
289412
Publisher
TNO
Collation
48 p.
Place of publication
Delft
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