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作 者:尹东屏[1] 张备[1] 孙燕[1] 田心如[1] 韩桂荣[1]
机构地区:[1]江苏省气象台,南京210008
出 处:《气象》2010年第6期1-6,共6页Meteorological Monthly
基 金:江苏省重大科技支撑与自主创新示范工程项目(BE2008618)资助
摘 要:本文针对2003年和2006年梅汛期暴雨量集中在淮河流域而总雨量不同的特点,利用平均场的方法,较深入地研究了暴雨时梅雨锋的结构。研究得到:暴雨发生时有明显的梅雨锋区;暴雨量与锋区的强度成正比;暴雨区位于锋区中即在对流层中低层的高温高湿区的偏北区域中,也就是低空急流的北部;锋生函数的切变变形场与暴雨的落区重叠;经向锋生函数的正值区呈直柱状,与南风等风速线的密集区相重叠,纬向分布的锋生函数指示了暴雨区的范围。Because the rainstorm precipitation amounts in the 2003 and 2006 Meiyu seasons are concentrated in the Huaihe Valley and their total precipitation amounts are different,the article has conducted the thorough research in the frontal zone structure by using the average field method.The results can be drawn as follows.(1) There was a clear Meiyu front area while heavy rain occurred,and the rainstorm precipitation amount and the frontal zone intensity are proportional.(2) Rainstorm area was located at the frontal zone, i.e.in the north of the hot and humid areas in the middle lower troposphere,and also north of the low-altitude jet stream.(3) The shear deformation field of frontogenesis function overlapped with the rainstorm location,and the positive frontogenesis function area was shaped as an erect column and overlapped with the densified area of south wind isotachs.(4) Zonal distribution of the frontogenesis function instructed the rainstorm coverage.
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