Using the 3D composite radar data, along with a tracking algorithm developed at the MIUB (MEANIE 3D), we are able to follow the life cycle of precipitating cells. Figure 2 represents the mean vertical profile of the reflectivity, differential reflectivity, cross-correlation coefficient and specific differential phase as a function of time for one particular cell on the 20140609. The full life cycle is represented since the cell was first detected by the cell identification algorithm, until it dissipated.

Figure 1: RHI through a convective cell at 2 consecutive time steps observed by the BOXPOL on 20130701. From left to right the plots show reflectivity Z_H, differential reflectivity Z_DR, cross-correlation coefficient ρ_hv, specific differential phase KDP and hydrometeor classification. In the top pannel, a Z_DR column is visible, which marks the updraft location. Kdp is also enhanced is this region, and the hydrometeor classification algorithms identifies large srops. Just above, very high values of reflectivity coincident with low ρ_hv are observed. This part is classified as hail by the hydrometeor classification algorithm. In the next time step (bottom pannel) the Z_DR column became much narrower, and the highr KDP and Z_H values are mostly concentrated in the low levels. This indicates that the updraft is getting weaker and the heavier precipitation is now falling to the ground, as is confirmed by the heavy rain in the hydrometeor classification.

Figure 2: Evolution of the mean vertical profile of a tracked cell observed on 9 June 2014. The variables shown are reflectivity Z_H (top left), differential reflectivity Z_DR (top right), cross-correlation coefficient ρ_hv (bottom left), and specific differential phase KDP (bottom right).

radar/lifecycle.txt · Zuletzt geändert: 2016/07/13 12:35 von chris