低纬高原地区一次中尺度对流复合体个例研究

利用地球静止气象卫星(GMS)资料和有限区域暴雨预报模式(HLAFS)分析场,对1999年6月6日低纬高原地区发生的一次中尺度对流复合体(MCC)进行了分析.研究结果表明,MCC发生在副热带高压与滇缅高压之间辐合区中;受两高之间辐合区及云贵高原地形的影响,MCC位于500hPa一个明显的中尺度辐合线上,垂直速度中心强度比其他地区的MCC约大1倍,无辐散层位于400～500hPa之间,北侧准静止锋锋区很强.

A Study of Mesoscale Convective Complexes over Low Latitude Plateau

A mesoscale convective complexes (MCC) over the low latitude plateau on 6 June 1999 is analyzed using GMS and HLAFS data. The results show that it is initiated in the convergence area be- tween subtropical high and the anticyclone over Yunnan and Myanmar (Burma). The MCC occurs near a mesoscale convergence line at 500 hPa due to the influence of the convergence area between two cy- clones and the relief of the Yunnan and Gulzhou Plateau. The maximal vertical velocity of the MCC is greater than the other MCCs, and its non--divergence level appears at 400~ 500 hPa. Moreover, it is found that the quasi--stationary front at the north side of the MCC is very strong.