Abstract
Abstract. Over the Cévennes–Vivarais region in southern France 5 h
intensive rainfall covering an area of 1000 km2 with more than 50 mm
of rain accumulation was observed during IOP7a of HyMeX. This study evaluates
the performance of a bin-resolved cloud model for simulating this heavy-precipitation event. The simulation results were compared with observations
of rain accumulation, radar reflectivity, temporal and spatial evolution of
precipitation, 5 min rain rates, and raindrop size distributions (RSDs).
The different scenarios for aerosol number concentrations range from 1000 to
2900 cm−3 and represent realistic conditions for this region. Model
results reproduce the heavy-precipitation event with respect to maximum rain
intensity, surface area covered by intense rain and the duration, as well as
the RSD. Differences occur in the short-term rainfall rates, as well as in
the drop number concentration. The cloud condensation number concentration
has a notable influence on the simulated rainfall, on both the surface
amount and intensity but also on the RSD properties, and should be taken into
account in microphysics parameterizations.
Funder
Agence Nationale de la Recherche
Subject
General Earth and Planetary Sciences
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