Investigation and evaluation of atmospheric pollutant input in the framework of PARCOM (North Sea) and HELCOM (Baltic Sea). Subreport: simulation of transport and deposition of atmospheric lead in the North-German coastal regions

This report describes the development and the validation of the high-resolution nonhydrostatic mesoscale model GESIMA. A detailed description of the model physics can be found in the internal reports GKSS 92/I/2-11 (reports I-X, see attached list). As an application the transport and deposition of atmosperic lead is simulated for a summer and a winter episode over the coastal zone of northern Germany. It is found that during a winter inversion episode the deposition rate in the wadden sea areas, which are considered ecologically valuable, amounts to about 0.5-1 μg/(m2h). This value is about five times the deposition rate over other rural areas of northern Schleswig-Holstein. Under sea-breeze conditions in summer the deposition rates in the southern part of the model area are considerably higher than in the northern part. (orig.)