Boundary Layer Characteristics,Energy Sources and Conversion of Two Night Rainstorms in Lyuliang Mountains
Using the conventional observations,NCEP/NCAR 1°×1° reanalysis and FY-2E satellite data,two night torrential rain processes,triggered respectively by meso-β elongated convective system(M[3ECS)and mesoscale convective complex(MCC)in Lyuliang Mountains,were simulated,and the backward trajectorys of the particles were traced.The conclusions were as follows:In the first process,the southerly jet and southwest airflow in the boundary layer had a significant impact.The westerly component of the low-level jet in western Shanxi and the strengthening of southwest airflow in the Jinzhong Basin emerged as crucial factors contributing to the resurgence of convective instability energy.In the second process,the southerly jet in the boundary layer was notably elevated,leading to the formation of clouds containing ice crystals in the middle and upper layers.Concurrently,the easterly jet supplied essential water vapor at lower altitudes.Notably,in both processes,the water vapor transported by particles in the boundary layer(0.8-1.2 km)significantly exceeded that in the low-level layer(1.5-3 km).Furthermore,the diabatic processes occurring above 700 hPa generated perturbative available potential energy,which was converted into perturbative kinetic energy,serving as the primary energy source for the short-term heavy precipitation observed in both processes.
night rainstormmesoscale convective systemboundary layershort-time heavy precipitationenergy conversion
万方数据
维普
