利用完全弹性三维冰雹云模式,模拟研究了初始扰动对积云发生发展的影响。模拟结果表明,对流发生层结条件满足的情况下,不同初始扰动会导致云不同的发生发展。扰动中心位温偏差大小适当,仅增加扰动厚度或降低扰动中心高度均能使积云发展更快、强度更大;适当减小水平扰动半径能促使积云提前发展,但会导致对流强度减弱;而增大扰动中心位温偏差,不但能增加对流强度,还能促使积云提前发展。
A threc-dimensional hailstorm numerical model with fully elastic primitive equations is used to simulate the effects of the initial disturbance on the occurrence and development of convective clouds. The simulation results with the environmental stability starting convection show that the initial perturbation is one of the key elements that influence the development of the cumulus. And increasing the disturbance thickness or reducing the perturbation center height separately will strengthen and quicken the cumulus when the initial potential temperature deviation is adequacy; the convective will develop faster with a smaller disturbance horizontal radius, but it will be weakened under this condition; nevertheless the cumulus develops faster and more intensely with a larger disturbance potential temperature deviation.