朱禾,邓北胜,吴洪. 2002. 湿位涡守恒条件下西南涡的发展[J]. 气象学报, 60(3):343-351, doi:10.11676/qxxb2002.041
湿位涡守恒条件下西南涡的发展
THE DEVELOPMENT OF SOUTHWEST VORTE IN CONSERVATION OF MOIST POTENTIAL VORTICITY
投稿时间:1999-09-29  修订日期:2000-08-08
DOI:10.11676/qxxb2002.041
中文关键词:  西南涡  湿位涡守恒  南亚高压
英文关键词:Southwest China vortex  Conservation of moist potential vorticity  South Asia high
基金项目:国家自然科学基金项目(9899);“长江三峡二期工程气象保障”课题
作者单位
朱禾 中国气象局培训中心, 北京, 100081 
邓北胜 中国气象局培训中心, 北京, 100081 
吴洪 中国气象局培训中心, 北京, 100081 
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中文摘要:
      运用高分辨率数值预报模式(HIRLAM)模拟了一次中国西南地区在多种活跃天气系统影响下,西南涡的发展过程。分析了东亚季风、青藏高压、地形等多种尺度与不同高低空环流形势配合以及在湿位涡守恒条件下对流发展时,潜热及不稳定能量的释放,对中尺度涡旋和强对流发生发展的作用,探讨了西南涡和局地降水增强与消亡的成因与理论,并具有实用意义。
英文摘要:
      By using the high resolution limited area model (HIRLAM) and real data from the T106 model, the development of Southwest China vortex associated with the precipitation process over Jinfo Mountains by affection of South China Sea monsoon is simulated. The affections of South China Sea monsoon, South Asia high, topography lifting, and conservation of moist potential vorticity on the development of vortex and strong convection are discussed in detail. The results show that all these could affect the precipitation process, but here we emphasize that their properly vertical structure will play a more important role. As shown in the results, the Meiyu front is formed by the confrontation between the South China Sea monsoon and the cold air from the north in the low. When this front has been properly overlapped with South Asia high, the int ensified convection will be excited from the southwest vortex center existing in the front and causes the precipitation. But along with the more cold air from the north moving into this area in the late phase, the subtle balance will be destroyed by this motion. The precipitation stopped even if the souhtwest vortex still existed in the low.
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