| 亚洲季风变动与大气正压/斜压运动动能变化的气候特征 |
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| 引用本文： | 管兆勇.亚洲季风变动与大气正压/斜压运动动能变化的气候特征[J].南京气象学院学报,2000,23(3):313-322. |
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| 作者姓名： | 管兆勇 |
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| 作者单位： | 南京气象学院大气科学系,南京,210044 |
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| 基金项目： | 国家自然科学基金资助项目!( 497752 65) |
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| 摘 要： | 使用ＮＣＥＰ／ＮＣＡＲ４０年（１９５８～１９９７年）月平均再分析资料，通过动力学论断研究了大气斜压／正压运动动能的变化及其相互转换，分析了亚洲季风变动与这两种动能变化的联系。指出：季风区大气运动动能的组成和变化具有独特的特征。冬季风时期大气斜压运动动能与正压运动动能具有正相关线性关系，斜压运动能向正压运动动能转换；春、秋季无论是东亚还是印度季风区斜压运动动能与正压运动动能之间转换都处于极小值，只是
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| 关 键 词： | 亚洲季风 斜压 正压模 动能转换 气候特征 |
| 修稿时间： | 2000-02-22 |
THE VARIATIONS OF ASIAN MONSOON AS REVEALED BY THE VARIATIONS OF KINETIC ENERGY OF BAROTROPIC/BAROCLINIC MODES OF THE WIND FIELD |
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| Guan Zhaoyong.THE VARIATIONS OF ASIAN MONSOON AS REVEALED BY THE VARIATIONS OF KINETIC ENERGY OF BAROTROPIC/BAROCLINIC MODES OF THE WIND FIELD[J].Journal of Nanjing Institute of Meteorology,2000,23(3):313-322. |
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| Authors: | Guan Zhaoyong |
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| Abstract: | WT5BZ]By using the monthly mean data from NCEP/NCAR 40 reanalysis(1958~1997),analyzed are the time evolutions of Asian monsoon by diagnosing the variations of kinetic energy of both the barotropic and the baroclinic modes of the wind field in terms of the atmospheric dynamic equations in the present article. It is found that there exist different features of the kinetic energy variations associated with barotropic and baroclinic components of airflow between monsoon and non monsoon regions. The time evolution of baroclinic kinetic energy is well linearly correlated with that of barotropic one in mosoon area during boreal winter.At the same time, there occurs the conversion of kinetic energy from baroclinic mode to barotropic one. The conversion of kinetic energy reaches their minimums with positive value in the Indian monsoon area and the negative in the east Asia during both spring and fall seasons. The kinetic energy of baroclinic winds is the major contributor to the total kinetic energy in monsoon areas during summertime whereas the kinetic energy of barotropic winds is the major part in middle and high latitudes. In monsoon areas, the magnitude of kinetic energy of barotropic mode decreases and eventually reaches the minimum from winter to summer. The kinetic energy of baroclinic mode as well as the kinetic energy conversions from baroclincic to barotropic mode changes in phase with the progresses of summer Asian monsoon. But the variations of these kinetic energy components in the east Asia are lagging to those in the Indian monsoon region. |
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| Keywords: | Asian monsoon baroclinic and barotropic modes kinetic energy conversion climatic feature |
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