| 1998年松嫩流域东北冷涡大暴雨过程的诊断分析 |
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| 引用本文： | 孙力,安刚.1998年松嫩流域东北冷涡大暴雨过程的诊断分析[J].大气科学,2001,25(3):342-354. |
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| 作者姓名： | 孙力 安刚 |
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| 作者单位： | 吉林省气象科学研究所,长春 130062 |
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| 基金项目： | 国家自然科学基金资助项目49875022 |
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| 摘 要： | 利用1998年6～8月松嫩流域95个测站的逐日降水和NCEP/NCAR逐日再分析资料，通过诊断分析方法，对1998年松嫩流域东北冷涡大暴雨的形成过程及其大气环流背景，暴雨过程的降水性质与水汽输送特征，大气低频振荡与持续性降水的关系，以及东北冷涡暴雨随季节变化的特征等问题进行了探讨。结果表明，1998年松嫩流域较长的冷涡雨季中所发生的多次东北冷涡暴雨过程是很有代表性的，它们是大气环流由春末夏初到盛夏过渡不同进程中的产物，因而具有不同的环流背景和降水性质，且在洪涝灾害的形成中起着不同的作用，特别是亚洲季风水汽输送以及东亚大气30～50d和10～20d低频振荡对降水的持续性和阶段性变化均有至关重要的影响。
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| 关 键 词： | 冷涡 暴雨 水汽输送 大气低频振荡 |
A Diagnostic Study of Northeast Cold Vortex Heavy Rain over the Songhuajiang-Nenjiang River Basin in the Summer of 1998 |
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| SunLi and An Gang.A Diagnostic Study of Northeast Cold Vortex Heavy Rain over the Songhuajiang-Nenjiang River Basin in the Summer of 1998[J].Chinese Journal of Atmospheric Sciences,2001,25(3):342-354. |
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| Authors: | SunLi and An Gang |
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| Abstract: | By using the diagnostic analysis method, studied are the general circulation conditions of the northeast cold vortex heavy rainstorm over the Songhuajiang-Nenjiang River basin in the summer of 1998, the natures of the precipitation, the features of moisture transportation, and the relationship between the low frequency over East Asia and the persistent rainfall. The results show that the five northeast cold vortex heavy rainstorm cases over the Songhuajiang-Nenjiang river basin in the summer of 1998 are of most representative. They result from different atmosphere circulation patterns. Thus, with different synoptic background and precipitation natures, they play quite different roles in the formation of the flood. Especially, the Asian summer monsoon moisture transportation and the 30-50 day, 10-20 day low frequency oscillations play important roles in the persistent rainfall. |
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| Keywords: | cold vortex heavy rain moisture transportation low frequency oscillation |
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