| Conversion of Kinetic Energy from Synoptic Scale Disturbance to Low-Frequency Fluctuation over the Yangtze River Valley in the Summers of 1997 and 1999 |
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| 作者姓名： | 李跃风 |
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| 作者单位： | Laboratory for Climate Studies, National Climate Center, China Meteorological Administration, Beijing 100081 |
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| 基金项目： | the National Key Program for Developing Basic Sciences in China，国家自然科学基金 |
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| 摘 要： | In order to investigate the conversion of kinetic energy from a synoptic scale disturbance （SSD; period≤seven days） to a low-frequency fluctuation （LFF; period〉seven days）, the budget equation of the LFF kinetic energy is derived. The energy conversion is then calculated and analyzed for the summers of 1997 and 1999. The results show that the energy conversion from the SSD to the LFF is obviously enhanced in the middle and lower troposphere during the heavy rainfall, suggesting this to be one of mechanisms inducing the heavy rainfall, although the local LFF kinetic energy may not be enhanced.
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| 关 键 词： | 长江流域 夏季 天气变化 低频波动 动能变换 |
| 收稿时间： | 30 April 2006 |
| 修稿时间： | 2006-04-302006-12-25 |
Conversion of kinetic energy from synoptic scale disturbance to low-frequency fluctuation over the Yangtze River valley in the summers of 1997 and 1999 |
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| Li?Yuefeng.Conversion of Kinetic Energy from Synoptic Scale Disturbance to Low-Frequency Fluctuation over the Yangtze River Valley in the Summers of 1997 and 1999[J].Advances in Atmospheric Sciences,2007,24(4):591-598. |
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| Authors: | Li Yuefeng |
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| Institution: | Laboratory for Climate Studies, National Climate Center, China Meteorological Administration, Beijing 100081 |
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| Abstract: | In order to investigate the conversion of kinetic energy from a synoptic scale disturbance (SSD; period≤seven days) to a low-frequency fluctuation (LFF; period＞seven days), the budget equation of the LFF kinetic energy is derived. The energy conversion is then calculated and analyzed for the summers of 1997 and 1999.The results show that the energy conversion from the SSD to the LFF is obviously enhanced in the middle and lower troposphere during the heavy rainfall, suggesting this to be one of mechanisms inducing the heavy rainfall, although the local LFF kinetic energy may not be enhanced. |
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| Keywords: | kinetic energy conversion synoptic scale disturbance low-frequency fluctuation heavy rainfall Yangtze River valley |
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