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大气科学  2008 

2006年6月5~8日梅雨锋上中尺度对流系统引发福建北部暴雨的诊断分析

DOI: 10.3878/j.issn.1006-9895.2008.03.16

Keywords: 梅雨锋,暴雨,中尺度对流系统,非绝热加热,地形

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Abstract:

利用1°×1°经纬度的NCEP再分析资料、地面1h降水和卫星黑体辐射亮度温度资料,分析了2006年6月5~8日引发福建北部大暴雨的梅雨锋上的中尺度对流系统活动,探讨了梅雨锋上或锋前暖区一侧中尺度对流系统触发和增强的动力机制,并进一步研究了强降水凝结潜热造成的非绝热加热在对流系统发生发展中的作用。结果发现:福建北部强降水产生是由梅雨锋上或锋前多个β中尺度或α中尺度的强对流系统活动造成的,这些中尺度对流系统的发生发展与大尺度地转强迫造成的上升运动、武夷山脉等的地形动力强迫抬升作用、梅雨锋锋生以及锋面的阻挡和直接抬升作用有关。梅雨锋上强降水造成的非绝热加热在中尺度对流系统的形成和发展中起到了重要作用。最后,总结出梅雨锋上中尺度对流系统发生发展的概念模型。

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