Meteorological conditions at the release site during the two tracer experiments

Advanced method for source term estimation and status of its integration in JRODOS

“…The source inversion method has been tested for a hypothetical release scenario (source term Muehleberg-1 from Seibert et al, 2013) and the meteorological conditions of the ETEX experiment (Gryning et al, 1998). The source term consisted of 21 nuclides and was characterized by two release phases of 0.5 and 4 h, separated by 2 h of no release before the beginning and after the end of each release phase.…”

Probing ETEX-II data set with inverse modelling

“…At the release site, the front seems not to be accompanied by a change in a heat flux, see Fig. 12 in (Gryning et al, 1998). At least not before the following day which reflects typical diurnal/nocturnal variability of the heat flux and is less pronounced than for the first release, Fig.…”

“…At least not before the following day which reflects typical diurnal/nocturnal variability of the heat flux and is less pronounced than for the first release, Fig. 6 in (Gryning et al, 1998). Moreover, according to (Ryall and Maryon, 1998): "The observations of mainly light rain and drizzle in the general area do not support the presence of vigorous convective cloud, but the dynamics were indeed vigorous, and it seems likely that, at least in part, frontal uplift may have accounted for the dilution.…”

“…At the release site, according to the figures in (Gryning et al, 1998), the surface layer was well mixed-up during the first part of the release, and stably stratified later on. This statement is valid for both releases, the height of the mixedlayer being smaller in the ETEX-II case.…”

“…During the two hours preceding the passage of the front, according to (Gryning et al, 1998): "an uninterrupted vertical wind in the layer between the ground and up to 300m (the maximum range of the SO-DAR during this period) is measured". The front must have crossed the tracer plume before crossing the release site.…”