Periodic Evolution of Multiscale Precipitation Systems Developed within a Baiu Frontal Cloud Cluster

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概要

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• A meso-α-scale cloud cluster (CC) was observed in the Baiu frontal zone, located southwest of Kyushu, Japan, on July 7, 1996. It was characterized by a lifespan of approximately 20hours, stationary motion, and heavy precipitation of over 200mm in a period of 12hours. This paper contains a report of the characteristic features of internal multiscale precipitation systems observed within the CC, and their periodic evolutions as newly found facts. The CC consisted of a convective rainfall region, characterized by a meso-β_L-scale (100-200km) lineshaped convective system (convective line, Mβ_LCL), and a weak stratiform rainfall region on the lee side of the Mβ_LCL. The Mβ_LCL consisted of several band-shaped meso-β_S-scale (20-100km) convective systems (Mβ_SCSs), and each Mβ_SCS consisted of meso-γ-scale cumulonimbus clouds. The environmental atmosphere was characterized by a warm and moist inflow in the shallow layer (below 500m in height) associated with a cyclonic circulation of slow moving and shallow depression. Additionally, the CC was located within a large temperature gradient zone in the lower atmosphere (below 4000m in height) along the Baiu front. These were favorable environments for the generation and maintenance of the Mβ_LCL. The Mβ_LCLs were periodically generated with an interval of 5-6hours in almost the same region, and they showed a common evolution of structure and processes. The behavior of cold pools formed by the Mβ_LCLs on the northern side of the Mβ_LCL played a key role in the periodic evolution. The developed cold pool intensified the Mβ_SCSs in the Mβ_LCL and modified one of the Mβ_SCSs into an arc-shaped Mβ_SCS, that had similar characteristics to those of squall lines. Simultaneously, the arc-shaped Mβ_SCS became the sole Mβ_SCS that constituted Mβ_LCL. Finally, the Mβ_LCL decayed with the expansion of the cold pool. Another Mβ_LCL was generated when the favorable environment was restored after the cold pool dissipated, and the evolution process of the Mβ_LCL was repeated.

• 2006-06-26

著者

• TAKEDA Takao

  Hydrospheric Atmospheric Research Center, Nagoya University

• Takeda Takao

  Hydrospheric Atmospheric Res. Center Nagoya Univ.

• Tsuboki Kazuhisa

  Hydrospheric Atmospheric Research Center Nagoya University

• WAKAZUKI Yasutaka

  Hydrospheric Atmospheric Research Center, Nagoya University

• Wakazuki Yasutaka

  Hydrospheric Atmospheric Research Center Nagoya University

関連論文

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• Role of the Heated Landmass on the Evolution and Duration of a Heavy Rain Episode over a Meiyu-Baiu Frontal Zone
• Thermodynamic Impact of the Heated Landmass on the Nocturnal Evolution of a Cloud Cluster over a Meiyu-Baiu Front
• Structure and Evolution of Deeply Developed Convective Cells in a Long-Lived Cumulonimbus Cloud under a Weak Vertical Wind-Shear Condition
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• Structure of Convective Circulation in the Atmospheric Boundary Layer over the Northwestern Pacific Ocean under a Subtropical High
• Structure of Line-Shaped Convective Systems Obliquely Training to the Baiu Front Observed around the Southwest Islands of Japan
• Periodic Evolution of Multiscale Precipitation Systems Developed within a Baiu Frontal Cloud Cluster

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