| A Modified Moist Ageostrophic Q Vector |
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| 作者姓名： | 岳彩军 寿绍文 |
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| 作者单位： | Shanghai Typhoon Institute，China Meteorological Administration，Laboratory of Typhoon Forecast Technique/China Meteorological Administration，School of Atmospheric Sciences，Nanjing University of Information Science and Technology |
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| 基金项目： | 国家自然科学基金，Shanghai Typhoon Research Funding，Shanghai Weather Bureau Research Funding，Jiangsu Key Laboratory of Meteorological Disaster Funding |
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| 摘 要： | The quasi-geostrophic Q vector is an important rainfall associated with large-scale weather systems diagnostic tool for studying development of surface and is calculated using data at single vertical level. When ageostrophic Q vector was introduced, it required data at two vertical levels. In this study, moist ageostrophic Q vector is modified so that it can be calculated using data at a single vertical level. The comparison study between the original and modified moist ageostrophic Q vectors is conducted using the data from 5 to 6 July 1991 during the torrential rainfall event associated with the Changjiang-Huaihe mei-yu front in China. The results reveal that divergences of original and modified moist ageostrophic Q vectors have similar horizontal distributions and their centers are almost located in the precipitation centers. This indicates that modified moist ageostrophic Q vector can be used to diagnose convective development with reasonable accuracy.
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| 关 键 词： | 非地转矢量 加热方法 潮湿天气 降雨量 |
A modified moist ageostrophic <Emphasis Type="Italic">Q</Emphasis> vector |
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| Caijun?Yue,Shaowen?Shou.A Modified Moist Ageostrophic Q Vector[J].Advances in Atmospheric Sciences,2008,25(6):1053-1061. |
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| Authors: | Caijun Yue Shaowen Shou |
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| Institution: | [1]Shanghai Typhoon Institute, China Meteorological Administration, Shanghai 200030 [2]Laboratory of Typhoon Forecast Technique/China Meteorological Administration, Shanghai 200030 [3]School of Atmospheric Sciences, Nanjing University of Information Science and Technology, Nanjing 210044 |
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| Abstract: | The quasi-geostrophic Q vector is an important diagnostic tool for studying development of surface rainfall associated with large-scale weather systems and is calculated using data at single vertical level. When ageostrophic Q vector was introduced, it required data at two vertical levels. In this study, moist ageostrophic Q vector is modified so that it can be calculated using data at a single vertical level. The comparison study between the original and modified moist ageostrophic Q vectors is conducted using the data from 5 to 6 July 1991 during the torrential rainfall event associated with the Changjiang-Huaihe mei-yu front in China. The results reveal that divergences of original and modified moist ageostrophic Q vectors have similar horizontal distributions and their centers are almost located in the precipitation centers. This indicates that modified moist ageostrophic Q vector can be used to diagnose convective development with reasonable accuracy. |
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| Keywords: | moist ageostrophic Q vector modification latent heating torrential rainfall associated with mei-yu front |
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