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东亚一次典型切断低压引起的平流层空气深入侵过程的分析

, PP. 2315-2327

Keywords: 切断低压,平流层-对流层交换,平流层侵入

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Abstract:

?利用ERA-Interim再分析资料、卫星资料以及轨迹模式,对2010年6月19~23日东亚夏季一次典型切断低压(COL)过程中的动力、热力及化学结构进行了分析,并详细分析了平流层空气深入侵过程和路径.AIRS臭氧资料与臭氧探空资料分析表明,在COL发展成熟阶段,由极区高位势涡度、高臭氧库区脱离出来的空气在COL的中心形成一个局地高位势涡度与高臭氧浓度区域,并在对流层中上部出现臭氧次峰结构.前向轨迹模式模拟结果表明:COL形成前期,高空槽加深,槽后偏北风急流可以引起极区下平流层空气向中纬度对流层中低层侵入,从而使对流层中低层臭氧浓度升高;COL发展成熟阶段,可以引起平流层空气的“旋转式”入侵.最后,应用后向轨迹模式对成熟阶段COL内部及周围空气块源地做进一步模拟分析.结果表明:(1)COL中心高浓度臭氧空气块源地有两个,一是中西伯利亚北部上空的副极地涡旋,这部分气块对COL中心的高臭氧浓度起主要作用;二是90°E以西,50°N附近的温带急流轴左侧的气旋式风速切变区.(2)COL周围低臭氧浓度的气块源地也有两个,一是COL底部臭氧浓度相对较低的空气块主要来自急流轴右侧反气旋式风速切变区,以平流运动为主;二是COL前部及后部的空气块主要来自COL南侧低层暖区,以上升运动为主.

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