| Characteristics of Zonal Propagation of Atmospheric Kinetic Energy at Equatorial Region in Asia |
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| 作者姓名： | GAO Hui CHEN Longxun HE Jinhai TAO Shiyan JIN Zuhui |
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| 作者单位： | Laboratory for Climate Studies of China Meteorological Administration，Chinese Academy of Meteorological Sciences，Department of Atmospheric Sciences，Institute of Atmospheric Physics National Climate Center，Beijing 100081 Beijing 100081 Nanjing University of Information Science and Technology Nanjing 210044，Chinese Academy of Sciences，Beijing 100029 |
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| 摘 要： | Based on the daily NCEP/NCAR reanalysis dataset from 1980 to 1997, the zonal propagations of 850 hPa kinetic energy (KE) and meridional wind (v) at equatorial region are examined respectively. Results show that the strongest center of KE in the tropical Asian monsoon region is located at 75°-90°E, with the secondary over the Somalia low-level jet channel, i.e., about 50°E. East to 90°E, disturbances of both KE and v observed are mainly coming from the western Pacific Ocean and propagating westward to the Bay of Bengal (BOB) passing through the South China Sea. But the propagation directions of both KE and v are rather disorderly between the BOB and the Somalia jet channel. Therefore, the East Asian summer monsoon and the Indian summer monsoon are different in the propagating features of the disturbances of KE and v. Above facts indicate that East Asian monsoon system exists undoubtedly even at the equatorial region, and quite distinct from the Indian monsoon system, it is mainly affected by the disturbances coming from the tropical western Pacific rather than from the Indian monsoon region. The boundary of the two monsoon systems is around 95°-100°E, which is more westward than the counterpart as proposed in earlier studies by 5-10 degrees in longitude.
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| 关 键 词： | 动能 季风 东亚 大气科学 赤道区 |
| 收稿时间： | 2005/5/13 0:00:00 |
| 修稿时间： | 8/1/2005 12:00:00 AM |
Characteristics of Zonal Propagation of Atmospheric Kinetic Energy at Equatorial Region in Asia |
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| GAO Hui,CHEN Longxun,HE Jinhai,TAO Shiyan,JIN Zuhui.Characteristics of Zonal Propagation of Atmospheric Kinetic Energy at Equatorial Region in Asia[J].Acta Meteorologica Sinica,2006,20(1):86-94. |
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| Authors: | GAO Hui CHEN Longxun HE Jinhai TAO Shiyan JIN Zuhui |
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| Institution: | [1]Laboratory for Climate Studies of China Meteorological Administration, National Climate Center, Beijing 100081 [2]Chinese Academy of Meteorological Sciences, Beijing 100081 [3]Department of Atmospheric Sciences, Nanjing University of Information Science and Technology, Nanjing 210044 [4]Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | Based on the daily NCEP/NCAR reanalysis dataset from 1980 to 1997, the zonal propagations of 850 hPa kinetic energy (KE) and meridional wind (v) at equatorial region are examined respectively. Results show that the strongest center of KE in the tropical Asian monsoon region is located at 75°-90°E, with the secondary over the Somalia low-level jet channel, i.e., about 50°E. East to 90°E, disturbances of both KE and v observed are mainly coming from the western Pacific Ocean and propagating westward to the Bay
of Bengal (BOB) passing through the South China Sea. But the propagation directions of both KE and v are rather disorderly between the BOB and the Somalia jet channel. Therefore, the East Asian summer monsoon and the Indian summer monsoon are different in the propagating features of the disturbances of KE and v. Above facts indicate that East Asian monsoon system exists undoubtedly even at the equatorial region, and quite distinct from the Indian monsoon system, it is mainly a ected by the disturbances coming from the tropical western Pacific rather than from the Indian monsoon region. The boundary of the two monsoon systems is around 95°-100°E, which is more westward than the counterpart as proposed in earlier studies by 5-10 degrees in longitude. |
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| Keywords: | kinetic energy zonal propagation East Asian monsoon system Indian monsoon system |
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