Boundary layer ozone and cloud coverage at Paramaribo Station (5.8N 55.2W)

This report covers the first results of two new parameters measured at the para-maribo station after the latest extension of the site.

The first parameter is the surface ozone. The results show different patterns according to the seasonal, daily and diurnal variations of the ozone mixing ratio at the surface. The surface ozone mixing ratio strongly depends on a diurnal cycle. This cycle is a result of photochemical reactions and the formation and collapse of the daytime convective boundary layer.

The monthly averaged ozone mixing ratio varies with the seasons. During the wet season a decrease of surface ozone is observed, while during the dry seasons an Increase of surface ozone is observed. This could be a result of the more frequently wash-out of ozone and precursors of ozone, a better vertical mixing and less effective photochemical reactions during the wet season.

The second parameter measured is the cloud coverage. Two objective measurement methods i.e. the Total Sky Imager and the Radiation Station, are compared. The cloud coverage measurements made with TSI and the derived cloud coverage of the RS are in good accordance. The diurnal dynamics of the cloud coverage are also typical for tropical areas.

The two new measuring instruments give good results. They give reliable data output and form a great asset to the Paramaribo station. More extensive research using these new measurements and the ones already performed at the station will improve the understanding of the tropical atmosphere.