| Diagnostic Study on the Structural Characteristics of a Typical Mei-yu Front System and Its Maintenance Mechanism |
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| 作者姓名： | JIANG Jianying NI Yunqi |
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| 作者单位： | Department of Atmospheric Sciences，Nanjing University，Nanjing 210093，Chinese Academy of Meteorological Sciences，Beijing 100081 |
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| 摘 要： | In this paper, a typical mei-yu front process with heavy rainfall from June 12 to 15 in 1998 is analyzed. The results show that the mei-yu front is a front system which consists of an iso-θe dense area with strong horizontal gradient, a deep-convective cloud tower band, a passageway transporting warm and moist air flow from the summer monsoon surge in the mid and low levels to the south of the mei-yu front,and a migrating synoptic scale trough to the north of the mei-yu front, which transports cold and dry air southward in the mid and upper levels. The maintenance of the mei-yu front is realized by: (1) is a positive feedback between the moist physical process enhancing frontogenesis and the development of the strong convective system in front of the mei-yu front; (2) the sustaining system to the north of the mei-yu front which is a migrating synoptic scale trough transporting cold and dry air to the mei-yu front and positive vorticity to the mesoscale system in front of the mei-yu front.
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Diagnostic study on the structural characteristics of a typical mei-yu front system and its maintenance mechanism |
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| JIANG Jianying,NI Yunqi.Diagnostic Study on the Structural Characteristics of a Typical Mei-yu Front System and Its Maintenance Mechanism[J].Advances in Atmospheric Sciences,2004,21(5):802-813. |
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| Authors: | Jiang Jianying Ni Yunqi |
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| Institution: | Department of Atmospheric Sciences, Nanjing University, Nanjing 210093 Chinese Academy of Meteorological Sciences, Beijing 100081 |
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| Abstract: | In this paper, a typical mei-yu front process with heavy rainfall from June 12 to 15 in 1998 is analyzed. The results show that the mei-yu front is a front system which consists of an iso-θe dense area with strong horizontal gradient, a deep-convective cloud tower band, a passageway transporting warm and moist air flow from the summer monsoon surge in the mid and low levels to the south of the mei-yu front,and a migrating synoptic scale trough to the north of the mei-yu front, which transports cold and dry air southward in the mid and upper levels. The maintenance of the mei-yu front is realized by: (1) is a positive feedback between the moist physical process enhancing frontogenesis and the development of the strong convective system in front of the mei-yu front; (2) the sustaining system to the north of the mei-yu front which is a migrating synoptic scale trough transporting cold and dry air to the mei-yu front and positive vorticity to the mesoscale system in front of the mei-yu front. |
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| Keywords: | mei-yu front structural characteristics maintenance mechanism moist physical process |
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