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Study of a CO2 high concentration event at Plateau Rosa station (Italy) with WRF model

pubblicazioni - Articolo

Study of a CO2 high concentration event at Plateau Rosa station (Italy) with WRF model

(Italy) with WRF model Francesco Apadula*, Daniela Heltai*, Andrea Lanza*,Silvia Ferrarese**, Claudio Cassardo**, Andrea Ferrero**, Caterina Francone**, Arnaldo Longhetto**, Massimiliano Manfrin** ACP – Symposium on Atmospheric Chemistry and Physics at Mountain Sites Interlaken, Switzerland, 8-10 Giugno 2010 PRESENTAZIONE POWER POINT * ERSE SPA ** UNIVERSITÀ DI TORINO Plateau Rosa station is located in the Italian Alps (45.93°N, 7.70°E, elevation 3480m a.s.l.), and it is one of the highest atmospheric monitoring station in Europe. For its elevation and position, in the free atmosphere upon an extended snow-clad, bare mountain plateau, far from urban and polluted zones, Plateau Rosa can be considered a remote station, suitable for the background measurements of greenhouse gases. The atmospheric CO 2 concentration has been measured since 1989, and now the time series extends for 20 years (since 1993 the measurements are continuous). The time trend of the monthly mean values of the CO 2 background concentrations is 1.94 ppm/year. Plateau Rosa station is included in the GAW world-wide network of the WMO and in the Italian national network (“GreenNet”). The 30-minutes CO 2 concentration data measured at Plateau Rosa have shown, during February 2004, two exceptional peaks higher than 400 ppmv on the 19 th and the 23 rd . Very high values have also been measured in two close stations of Zugspitze (47.42°N, 10.98°E, 2656m) and Sonnblick (47.02°N, 12.95°E, 3106m), located on the Alps, and in Monte Cimone (44.18°N, 10.70°E, 2165m), located on the northern Italian Apennines. In order to study the wind patterns during the two episodes and to investigate the CO 2 source regions, the atmospheric mesoscale model WRF (Weather Research & Forecasting Model) has been run. As initial and boundary conditions for this simulation, the 6-hour ECMWF analyses on surface and pressure levels have been extracted. The simulation has covered the European area, with a nested grid zoomed over the Alpine zone. The contribution of polluted air masses from Central and North Europe and Po valley is investigated. The simulation results will be presented and the correlations with the CO 2 concentrations will be discussed. This work has been partially financed by the Research Fund for the Italian Electrical System under the Contract Agreement between ERSE and the Ministry of Economic Development – General Directorate for Energy and Mining Resources stipulated on July 29, 2009 in compliance with the Decree of March 19, 2009.

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