THE NUMERLCAL SIMULATION OF FRON-TOGENESIS PROCESS FORCED BY DUST RADIATIVE HEATING

In this paper, the frontogenesis process forced by dust radiative heating and effect of radiative heating of an isolation duststorm on the frontal circution system are investigated by two- and three-dimension numerical models. The results show that as the duststorm outbreak, the radiative heating results in frontogenesis in lower troposhere layer in daytime and produces an obvious isentropic mixed layer above duststorm center. The horizontal velocity field along the direction of front movement displays the characteristics of typical convergence pattern. At night, the frontolysis occurs due to the radiative cooling of dust. An obvious vertical circulation along large-scale wind direction is forced by the radiative heating of the isolated duststorm. The vertical circulation is stronger in daytime and become weaker at night. The direction of the vertical circulatior in daytime is opposite to that at night. The response of the horizontal wind.fields on radiative heating from dust are different at different heights.