1993年初夏中国东部沿海爆发性气旋形成条件的数值模拟试验

SIMULATION ON FORMATION PREREQUISITES OF EXPLOSIVE CYCLONE OF EARLY JUNE 1993

文中利用 PSU/NCAR中尺度模式 MM4对 1 993年 6月初发生在中国东部沿海地区的一次爆发性气旋进行了数值试验。结果表明 :初夏季节在中国东部沿海气旋爆发性发展必须具备下面两个条件 :(1 )高空南北支急流中分别存在发展的低槽系统 ,北部低槽伴有冷空气 ,南部低槽伴随有强暖湿空气 ,两低槽在中国东部沿海合并后形成一个深槽 ,引起地面气旋爆发性发展 ;(2 )东部沿海对流层低层形成一个强水汽通道 。

In this paper ,the PSU/NACR MM4 model are employed to investigate the prerequisite conditions to a explosive cyclone which happened in June 1-2 1993 at Yellow Sea. Several smoothing test are conducted and the result shows that the merge of the troughs associated with the northern cold air and the southern moist jet ,the strong low level moisture transport channel are two indispensable factors to the explosive cyclone development which happens in China′s eastern coastal area in early summer.