The measurement data for Hohenpeissenberg is
found to be 5-fold higher than the model results.
The Hohenpeissenberg station is located in a rural agricultural and forested area;
the air arriving at this measurement site due to convective lifting of
the boundary layer is enriched in a number of biogenic VOCs (e.g.
terpenes and isoprene) with surface sources. The polluted air
masses from the East of Hohenpeissenberg (Kaiser et al., 2007)
contribute additional VOC, leading to overall higher production of
RO2. The duration of the field campaigns varies from day to night
and days to months, which causes variation between the model and
measurement data if there is a local source around the monitoring
station.