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OROGRAPHIC INFLUENCE ON DEEP CONVECTION: CASE STUDY AND SENSITIVITY EXPERIMENTS

S. Davolio orcid id orcid.org/0000-0001-8704-1814 ; ISAC-CNR Via Gobetti, 101 40129 Bologna, Italy
A. Buzzi ; ISAC-CNR Via Gobetti, 101 40129 Bologna, Italy
P. Malguzzi ; ISAC-CNR Via Gobetti, 101 40129 Bologna, Italy


Puni tekst: engleski pdf 326 Kb

str. 159-162

preuzimanja: 573

citiraj


Sažetak

The non hydrostatic convection resolving model MOLOCH is employed in order to evaluate its capability to realistically simulate the evolution of a mesoscale convective system responsible for an episode of heavy rainfall and flood over southeastern France (Gard event). Numerical experiments indicate large sensitivity of precipitation amounts and distribution, due to different cell organization and propagation, to the specification of the initial
conditions.
Further experiments, aimed at studying the role played by the orography in triggering the convection and controlling its evolution, have been performed in order to characterize sensitivity to ambient wind and orography. Although the convective system remained almost stationary for many hours with maximum precipitation located at some distance upstream of the mountain main slope, simulations demonstrate that the presence of the orographic barrier is essential
for both triggering and maintaining the mesoscale convective system. The intensity of precipitation turns out to be sensitive to small variations of the mean meridional wind component.

Ključne riječi

convection; orography; precipitation

Hrčak ID:

64512

URI

https://hrcak.srce.hr/64512

Datum izdavanja:

15.12.2005.

Posjeta: 967 *