| 青藏高原东侧一次连续大暴雨过程湿Q矢量分析 |
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| 引用本文： | 刘运成.青藏高原东侧一次连续大暴雨过程湿Q矢量分析[J].气象,2006,32(12):43-49. |
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| 作者姓名： | 刘运成 |
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| 作者单位： | 兰州大学大气科学学院,730000;四川省广元市气象局 |
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| 基金项目： | 致谢：在本工作的进行过程中,得到兰州大学王澄海教授和隆霄博士的指导,在此表示感谢! |
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| 摘 要： | 利用常规探空和地面实测资料，对2005年7月18—19日出现在青藏高原东侧的一次区域性大暴雨天气过程进行了非地转湿Q矢量诊断分析。结果表明：（1）暴雨出现在湿Q矢量散度负值中心激发的非地转上升气流区附近，在强降水期散度负值中心达到最强，范围较窄，与暴雨区对应得较好。（2）700hPa湿Q矢量涡度正值中心与其散度负值中心重叠的区域是中尺度低值系统发展的有利区域，与暴雨区对应。（3）700hPa湿Q矢量锋生中心可以对应12小时后的暴雨区；当有不稳定能量大量释放后，有锋消作用，暴雨将逐渐减弱。
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| 关 键 词： | 湿Q矢量 大暴雨 诊断分析 |
| 收稿时间： | 04 11 2006 12:00AM |
| 修稿时间： | 2006-04-112006-08-25 |
Wet Q-Vector Analysis of a Continued Heavy Rain Process over the Eastern Qinghai-Xizang Plateau |
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| Liu Yuncheng.Wet Q-Vector Analysis of a Continued Heavy Rain Process over the Eastern Qinghai-Xizang Plateau[J].Meteorological Monthly,2006,32(12):43-49. |
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| Authors: | Liu Yuncheng |
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| Institution: | 1. College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000; 2. Guangyuan Weather Office, Sichuan Province |
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| Abstract: | Based on the routine observations,an ageostrophic wet Q-vector diagnosis of a heavy rain process over the eastern Qinghai-Xizang Plateau during 18-19 July 2005 is made. The results show as follows:(1) The heavy rain occurred in the updraft area triggered by the convergence center of the wet Q-vector.The convergence center is narrow and strong during the heavy precipitation.(2)The superposition area of the center of the positive vor-ticity and the convergence center of the wet Q-vector at 700hPa is advantageous to the me- soscale system.It corresponds well to the heavy rain area.(3)The center of frontogenesis at 700hPa corresponds to the heavy rain area after 12 hours.After the instability energy is re-leased largely,the air mass has frontolysis,and the heavy rain decreases gradually. |
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| Keywords: | wet Q-vector heavy rain diagnostic analysis |
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