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Archive

3rd HyMeX workshop 1-4 June 2009 Heraklion (Gournes), Crete-Greece

Convection and high impact weather studies by aircraft measurements and operation of the KITCube in the CORSICA observatory


Christoph Kottmeier (Institut für Meteorologie und Klimaforschung (IMK), Karlsruhe Institute of Technology); Ulrich Corsmeier, Norbert Kalthoff, Dominique Lambert, Evelyne Richard

An aircraft and ground-based measurement programme is planned as a central component of the HyMeX plans for studying atmospheric convection and Mediterranean cyclones causing high impact weather. Proven observation systems will be operated and combined with several new observation platforms. Ground based measurements are performed by the new research platform KITCube, which will be deployed at the northern tip of Corsica as part of the planned comprehensive oceanic and atmospheric CORSICA observatory. Located in the southern part of the Genoa Gulf as the most cyclogenetic area in western Mediterranean, ~80 km from the Italian coast and ~160 km from the French Riviera, Corsica itself is regularly affected by intense meteorological events like windstorms and heavy precipitation. It also provides a good vantage point for aircraft operations to adjacent coasts and mountain regions in France, Italy and Spain. The KITCube facility is designed to allow dedicated measurements of turbulence, convection initiation, and moist convection on the local scale and 10 km x 10 km mesoscale. The measuring devices are remotely controlled from a master control centre on site, where also relevant parameters are sampled, displayed, stored and distributed via internet. The control system takes advantage of the near real time data availability of the in situ and remote sensing data in generating and applying automatically instruments settings (e.g. scan pattern) adapted to the changing meteorological conditions. The CORSICA observatory comprises an improved data network with ground-based conventional weather stations, radiosounding station, O3 measurement, and radars. It complemends the wind profiler network around the western Mediterranean basin and in the island area. It is also planned to cover the synoptic scale, upstream processes in the atmosphere by measurements with the new long range and high altitude German research aircraft HALO. The HALO operations depend on the availability and funding situation. Additionally the research aircraft DO 128 will operate close to the sea surface for measurements of turbulent fluxes before, during and after the passage of cyclones.

We plan to perform modelling work in parallel with models of the COSMO family: COSMO-ART was developed at KIT to adress the scientific questions of (i) the importance of natural and anthropogenic aerosol particles for weather systems in the Mediterranean and the adjacent regions, and (ii) the interaction of aerosol particles with atmospheric chemistry within contributing to HyMeX and ChArMex. COSMO-DE is used in two-coupled nesting mode to study impacts on convection on cyclonic processes and vice versa. There will be also close links of the modelling work with the experimental activities of HyMex and ChArMex, as the models need the data for the initialization and the validation of the model. Within a planned German-Italian cooperation on coupling the regional ocean model NEMO to the regional climate model COSMO-CLM, the regional climate evolution and changes in the water cycle are investigated.