| Comparison of the Double Summer Monsoon Troughs over East Asia |
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| 作者姓名： | WANG Lijuan GUAN Zhaoyong HE Jinhai XU Haiming |
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| 作者单位： | Jiangsu Key Laboratory of Meteorological Disaster Nanjing University of Information Science & Technology，Jiangsu Key Laboratory of Meteorological Disaster，Nanjing University of Information Science & Technology，Jiangsu Key Laboratory of Meteorological Disaster，Nanjing University of Information Science & Technology，Jiangsu Key Laboratory of Meteorological Disaster，Nanjing University of Information Science & Technology，Nanjing 210044 Department of Atmospheric Sciences Nanjing University of Information Science & Technology Nanjing 210044，Nanjing 210044 Department of Atmospheric Sciences Nanjing University of Information Science & Technology Nanjing 210044，Nanjing 210044 Department of Atmospheric Sciences Nanjing University of Information Science & Technology Nanjing 210044，Nanjing 210044 Department of Atmospheric Sciences Nanjing University of Information Science & Technology Nanjing 210044 |
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| 基金项目： | 江苏省高等教育委员会自然科学基金;国家自然科学基金 |
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| 摘 要： | Based on NCEP/NCAR reanalysis data, an investigation has been carried on the comparison of the double summer monsoon troughs over East Asia, which refer to the subtropical summer monsoon trough (subtropical-trough) and the South China Sea summer monsoon trough (SCS trough), respectively. The results show that the SCS trough is stronger than the subtropical-trough either in convergence or convection. The subtropical-trough extends up to higher levels and inclines northward with altitude, while, the SCS trough extends up to a lower level, and its position is seldom changed. The SCS trough establishes early and abruptly with the low level positive relative vorticity appearing suddenly, and retreats slowly, but the subtropical-trough establishes step by step with the positive relative vorticity initially over the Yunnan-Guizhou Plateau and Guangxi areas spreading gradually northeastward, and withdraws rapidly. The onset of SCS trough is obviously indicated by the reverse of the easterly, but the establishment of the subtropical-trough is characteristic of the westerly enhancement. The subtropical-trough has clearly frontal property, yet the SCS trough has not.
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| 关 键 词： | 东亚亚热带地区 夏季风槽 低压槽 气候特征 比较研究 |
| 收稿时间： | 1/8/2007 12:00:00 AM |
Comparison of the Double Summer Monsoon Troughs over East Asia |
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| WANG Lijuan,GUAN Zhaoyong,HE Jinhai,XU Haiming.Comparison of the Double Summer Monsoon Troughs over East Asia[J].Acta Meteorologica Sinica,2007,21(1):75-86. |
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| Authors: | WANG Lijuan GUAN Zhaoyong HE Jinhai and XU Haiming Jiangsu Key Laboratory of Meteorological Disaster Nanjing University of Information Science & Technology Nanjing |
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| Institution: | Jiangsu Key Laboratory of Meteorological Disaster, Nanjing University of Information Science
& Technology, Nanjing 210044
Department of Atmospheric Sciences, Nanjing University of Information Science & Technology, Nanjing 210044;Jiangsu Key Laboratory of Meteorological Disaster, Nanjing University of Information Science
& Technology, Nanjing 210044
Department of Atmospheric Sciences, Nanjing University of Information Science & Technology, Nanjing 210044;Jiangsu Key Laboratory of Meteorological Disaster, Nanjing University of Information Science
& Technology, Nanjing 210044
Department of Atmospheric Sciences, Nanjing University of Information Science & Technology, Nanjing 210044;Jiangsu Key Laboratory of Meteorological Disaster, Nanjing University of Information Science
& Technology, Nanjing 210044
Department of Atmospheric Sciences, Nanjing University of Information Science & Technology, Nanjing 210044 |
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| Abstract: | Based on NCEP/NCAR reanalysis data, an investigation has been carried on the comparison of the double summer monsoon troughs over East Asia, which refer to the subtropical summer monsoon trough (subtropical-trough) and the South China Sea summer monsoon trough (SCS trough), respectively. The results show that the SCS trough is stronger than the subtropical-trough either in convergence or convection. The subtropical-trough extends up to higher levels and inclines northward with altitude, while, the SCS trough extends up to a lower level, and its position is seldom changed. The SCS trough establishes early and abruptly with the low level positive relative vorticity appearing suddenly, and retreats slowly, but the subtropical-trough establishes step by step with the positive relative vorticity initially over the Yunnan-Guizhou Plateau and Guangxi areas spreading gradually northeastward, and withdraws rapidly. The onset of SCS trough is obviously indicated by the reverse of the easterly, but the establishment of the subtropical-trough is characteristic of the westerly enhancement. The subtropical-trough has clearly frontal property, yet the SCS trough has not. |
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| Keywords: | double summer monsoon troughs East Asian subtropical South China Sea (SCS) climatological features |
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