The area of Rome represents a unique site for studies on Mediterranean precipitation both for the availability of instumentation and for its position in the Mediterranean basin. The radar meteorology group of CNR-ISAC of Rome manages the coherent C-band Doppler dual polarization radar Polar 55C. The radar has being working since 2001 at the Rome ISAC site, located 30 km northeast from the coast of the Tyrrhenian Sea and 20 km southeast of Rome downtown (41°50’24” North, 12°38’50” East, 102 m asl). Polar 55C can observe precipitation over the farthest part of the Tiber basin, the urban area of Rome, the Appennin Range (where snow precipitation can occur during winter season), and a significant portion of the Tyrrhenian sea. In the current configuration, Polar 55C can measure radar reflectivity factor, differential reflectivity, Doppler velocity, Doppler spectrum and differential phase shift. Polar 55C can play a key role in the study of the interaction between the local and the mesoscale circulation and for the observation of meteorological events involving the city of Rome. Being a research radar, it is operated according to scientific objectives, that can ranges from radar applications to hydrometeorological modelling of urban and rural areas to the ground validation of precipitation satellite measurements. Studies on quantitative precipitation estimation are focused on dual polarization radar techniques. Within the coverage area of Polar 55C radar is the network of telemetered raingauges and hydrographs managed by Servizio Idrografico Regionale (the regional hydrologic service) of the Lazio regional government. Average spatial density of the network raingauges is 1 per 100 km2 and become quite dense within the historic center of Rome. Most of the raingauges have a 5-minutes time resolution and some of them have a resolution of 1 min. In the year 2008 several interesting case sudies have been observed by Polar 55C. Some of them will be discussed to highlight the use of dual polarization techniques to overcome critical aspects of radar rainfall estimation. Example concerns also the analysis of the scaling properties of rainfall in space by using data from the raingauge network and Polar 55C over the area of Rome. The aim is the identification of spatial scaling regimes, their ranges of validity, and the evaluation of the corresponding scaling properties and the dependence structure of rainfall (time and space correlation between time series for different time scales).
Baldini, L., Gorgucci, E., Romaniello, V., Russo, F., Montesarchio, V., Sebastianelli, S., et al. (2010). Dual polarization radar observations of precipitation events in the area of Rome. In 4th HyMeX workshop.
Dual polarization radar observations of precipitation events in the area of Rome
VOLPI, ELENA;LOMBARDO, FEDERICO
2010-01-01
Abstract
The area of Rome represents a unique site for studies on Mediterranean precipitation both for the availability of instumentation and for its position in the Mediterranean basin. The radar meteorology group of CNR-ISAC of Rome manages the coherent C-band Doppler dual polarization radar Polar 55C. The radar has being working since 2001 at the Rome ISAC site, located 30 km northeast from the coast of the Tyrrhenian Sea and 20 km southeast of Rome downtown (41°50’24” North, 12°38’50” East, 102 m asl). Polar 55C can observe precipitation over the farthest part of the Tiber basin, the urban area of Rome, the Appennin Range (where snow precipitation can occur during winter season), and a significant portion of the Tyrrhenian sea. In the current configuration, Polar 55C can measure radar reflectivity factor, differential reflectivity, Doppler velocity, Doppler spectrum and differential phase shift. Polar 55C can play a key role in the study of the interaction between the local and the mesoscale circulation and for the observation of meteorological events involving the city of Rome. Being a research radar, it is operated according to scientific objectives, that can ranges from radar applications to hydrometeorological modelling of urban and rural areas to the ground validation of precipitation satellite measurements. Studies on quantitative precipitation estimation are focused on dual polarization radar techniques. Within the coverage area of Polar 55C radar is the network of telemetered raingauges and hydrographs managed by Servizio Idrografico Regionale (the regional hydrologic service) of the Lazio regional government. Average spatial density of the network raingauges is 1 per 100 km2 and become quite dense within the historic center of Rome. Most of the raingauges have a 5-minutes time resolution and some of them have a resolution of 1 min. In the year 2008 several interesting case sudies have been observed by Polar 55C. Some of them will be discussed to highlight the use of dual polarization techniques to overcome critical aspects of radar rainfall estimation. Example concerns also the analysis of the scaling properties of rainfall in space by using data from the raingauge network and Polar 55C over the area of Rome. The aim is the identification of spatial scaling regimes, their ranges of validity, and the evaluation of the corresponding scaling properties and the dependence structure of rainfall (time and space correlation between time series for different time scales).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
