ERAD 2012 - THE SEVENTH EUROPEAN CONFERENCE ON RADAR IN METEOROLOGY AND HYDROLOGY EnKF assimilation of storm-scale, mobile Doppler radar data for high-resolution analyses of a weakly tornadic supercell
نویسندگان
چکیده
Recent efforts to include mobile and other non-standard ground-based radar data in ensemble analyses of severe convective storms have yielded promising results (e.g., Marquis et al. 2010; Snook et al. 2011; Tanamachi et al. 2012). During Project VORTEX2 (Wurman et al. 2010), the field phase of which occurred in spring 2009 and spring 2010, coordinated mobile Doppler radar deployments resulted in data collection in a variety of severe convective storms, including supercells and quasi-linear convective systems. This body of data provides a unique opportunity to verify wind retrievals against Doppler velocities recorded by other high-resolution radars. In this study, we assimilated data from C-band Shared Mobile Atmospheric Research and Teaching Radars (SMART-R; Biggerstaff et al. 2005), as well as other radars, into the Advanced Regional Prediction System (ARPS; Xue et al. 2000) to analyze the 26 May 2010 Prospect Valley, Colorado supercell (hereafter “the Prospect Valley storm”; Fig. 1). We evaluate these analyses by subjectively locating storm features and by comparing synthetic Doppler velocities produced from the analyzed model states to those observed by other radars. In contrast to most earlier EnKF studies of severe convective storms initialized in a horizontally homogeneous environment, we use horizontally inhomogeneous initial conditions (background), similar to some recent studies (Stensrud and Gao 2010; Snook et al. 2011; Jung et al. 2012). We selected the isolated, weakly tornadic Prospect Valley storm for study because radar coverage was exceptionally good. Because of its slow eastnortheastward movement over relatively flat terrain, this storm was easily
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1 Dept. of Electronic Engineering, Sapienza University of Rome, Via Eudossiana 18, Rome, Italy E-mail: [email protected], [email protected], [email protected] 2 Center of Excellence CETEMPS, University of L’Aquila, Via Vetoio, L’Aquila, Italy E-mail: [email protected] 3 Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata, Rome, Italy E-mail: marco.chini...
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