| 青藏高原中部闪电活动与相关气象要素季节变化的相关分析 |
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| 引用本文： | 袁 铁,郄秀书.青藏高原中部闪电活动与相关气象要素季节变化的相关分析[J].气象学报,2005,63(1):123-128. |
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| 作者姓名： | 袁 铁 郄秀书 |
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| 作者单位： | 1. 中国科学院寒区旱区环境与工程研究所雷电与雷暴实验室,兰州大学大气科学学院,兰州,730000
2. 中国科学院寒区旱区环境与工程研究所雷电与雷暴实验室,兰州,730000 |
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| 基金项目： | 国家杰出青年科学基金 (4 0 3 2 5 0 13 )。 |
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| 摘 要： | 利用 1995年 4月至 2 0 0 2年 12月间卫星观测的闪电资料与NCEP再分析资料中的地表降水率、云功函数和热通量 ,分析了青藏高原中部闪电活动与相关气象要素季节变化之间的关系。研究发现 :青藏高原中部闪电活动的峰值出现在 7月份 ,并在春季表现出明显的闪电活动 ;相关气象要素中 ,最能够准确描述闪电活动的季节变化及其春季异常特征的仅有地表总热通量 ;降水 (或云功函数 )与鲍恩比 (感热通量和潜热通量之比 )的乘积能够较好地反映闪电活动的季节分布特征与春季的“异常”。结果表明 ,感热通量或鲍恩比可能在对流有效位能向对流上升动能的转化过程中起着重要的作用 ,鲍恩比可作为修正闪电产生效率的一个重要参量。
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| 关 键 词： | 青藏高原 闪电活动 季节变化 热通量 波纹比 |
| 收稿时间： | 2004/2/16 0:00:00 |
| 修稿时间： | 2004年2月16日 |
SEASONAL VARIATION OF LIGHTNING ACTIVITIES AND RELATED METEOROLOGICAL FACTORS OVER THE CENTRAL QINGHAI-XIZANG PLATEAU |
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| Yuan Tie and Qie Xiushu.SEASONAL VARIATION OF LIGHTNING ACTIVITIES AND RELATED METEOROLOGICAL FACTORS OVER THE CENTRAL QINGHAI-XIZANG PLATEAU[J].Acta Meteorologica Sinica,2005,63(1):123-128. |
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| Authors: | Yuan Tie and Qie Xiushu |
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| Institution: | School of Atmospheric Science, Lanzhou University, Lanzhou 730000;Cold and Arid Regions Environmental and Engineering Research Institute,
Chinese Academy of Sciences, Lanzhou 730000 |
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| Abstract: | The data from satellite observation on lightning activities, daily NCEP surface precipitation rate, noon cloud work function and heat fluxes from April 1995 to Dec 2000 were employed to study the seasonal variations of lightning activities and related meteorological factors over the central Qinghai Xizang Plateau, and the relationship between them. The results indicated that the maximum flash density is in July, and there are more lightning in spring than one may expect. Among the several related factors, only surface total heat flux can be account for the seasonal variation of lightning activities including the spring lightning. In addition, surface precipitation rate (or cloud work function) can better be account for the seasonal variation of lightning activities including the spring lightning when they are multiplied by the Bowen ratio (ratio of sensible to latent heat flux). This suggests that sensible heat flux or the Bowen ratio play an important role in transforming CAPE to updraft kinetic energy, and the later could be regarded as an important parameter of modifying the efficiency of generating lightning for any given value of precipitation rate (or cloud work function). |
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| Keywords: | Qinghai-Xizang Plateau Lightning activities Seasonal variations Heat flux Bowen ratio |
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