Study on the Positioning of Sounding Balloon Drifting associated with a process of Gale and Temperature Drop using MM5

With the improved model MM5, the impact of height-depending sounding balloon's drifting on mesoscale numerical model is analyzed, using new sounding data with accurate position message at each pressure level. Through the simulations of the process of a gale and temperature drop, we can conclude as follows: the differences of initial meteorological element fields especially the velocity field caused by position correction, would be great in lower layers or even more than that in upper layers when the atmospheric motion becomes heavy below 500hPa, although the differences are greater in upper layers than in lower layers in the mass; the position correction can reduce simulation errors not only in numerical values but also in sphere of influence, which makes the results more approaching to the observed data; After the position correction, the model can simulate the southward movement of the gale and temperature drop accurately, the simulated foreland of gale is corresponding with the observed data and the variation of the temperature field is consistent with the variation of the velocity field very well.