Structure of the Band-Shaped Precipitation System Inducing the Heavy Rainfall Observed over Northern Kyushu, Japan on 29 June 1999
スポンサーリンク
概要
- 論文の詳細を見る
A band-shaped precipitation system, associated with a cold front, caused heavy rainfall over northern Kyushu, Japan, on 29 June 1999. This precipitation system had a hierarchical structure with different horizontal scales; the precipitation system consisted of several mesoscale convective systems (MCSs), and each MCS consisted of a few convective cells that formed successively on its upstream side. Each of them had different spatial and time scales, as well as different traveling speeds and directions. Low-level humid air from the southwest and middle-level dry air from the west continuously flowed into the precipitation system. This dry air was not colder than the surrounding atmosphere. The inflow of low-level humid air initiated the MCSs, and that of middle-level dry air enhanced, and maintained, the convective instability over the cold front. The heavy rainfall was brought under the maintenance condition of convective instability. The cloud top heights of convective cells were found differently between the western and central parts of the precipitation system. The factors to determine them were examined using the successful simulation results of a nonhydrostatic cloud-resolving model, with the horizontal resolution of 2km. The intrusion of middle-level dry air into convective cells was considerably larger in the western part than in the central part. This caused the difference in the cloud top heights of the convective cells; the convective cells were less than 7km high in the western part, whereas, in the central part, most were between 5 and 7km high and at the height of the tropopause. In the western part, most of the convective cells completely lost their buoyancy because of the significant evaporative cooling of hydrometeors. These results show the two different effects of middle-level dry air; a huge amount inflow suppresses the development of convective cells, while it strongly enhances the convective instability.
- 社団法人日本気象学会の論文
- 2006-02-27
著者
関連論文
- Formation and Maintenance Processes of a Stationary Band-shaped Heavy Rainfall Observed in Niigata on 4 August 1998
- Statistical Study on Cloud Top Heights of Cumulonimbi Thermodynamically Estimated from Objective Analysis Data during the Baiu Season
- Numerical Simulation of the Quasi-Stationary Snowband Observed over the Southern Coastal Area of the Sea of Japan on 16 January 2001
- An Overview of the Field Experiment "Winter Mesoscale Convective Systems (MCSs) over the Japan Sea in 2001", and Comparisons of the Cold-air Outbreak Case (14 January) between Analysis and a Non-hydrostatic Cloud-resolving Model
- Dual Wind Profiler Observations of a Line-Shaped Convective System in Southern Kyushu, Japan
- Three-dimensional distribution of water vapor estimated from tropospheric delay of GPS data in a mesoscale precipitation system of the Baiu front
- Reason for the Failure of the Simulation of Heavy Rainfall during X-BAIU-01 : Importance of a Vertical Profile of Water Vapor for Numerical Simulations
- Structure and Development of Two Merged Rainbands Observed over the East China Sea during X-BAIU-99 : Part II: Meso-α-Scale Structure and Build-up Processes of Convergence in the Baiu Frontal Region
- Structure and Development of Two Merged Rainbands Observed over the East China Sea during X-BAIU-99 : Part I: Meso-β-Scale Structure and Development Processes
- Changes in the Baiu Frontal Activity in the Future Climate Simulated by Super-High-Resolution Global and Cloud-Resolving Regional Climate Models
- Vertical Structure of Local Fronts Observed in Kanto, Japan
- A Study of Meso-α-Scale Disturbances on the Baiu Front and Their Environmental Field
- Structure of the Band-Shaped Precipitation System Inducing the Heavy Rainfall Observed over Northern Kyushu, Japan on 29 June 1999
- Statistical Study of Band-Shaped Rainfall Systems, the Koshikijima and Nagasaki Lines, Observed around Kyushu Island, Japan
- Reply