| THE EFFECT OF WARM POOL THERMAL STATES ON TROPICAL CYCLONES IN THE WESTERN NORTH PACIFIC |
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| 作者姓名： | 陈光华 黄荣辉 |
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| 作者单位： | Center for Monsoon System Research Institute of Atmospheric Physics of CAS，Center for Monsoon System Research Institute of Atmospheric Physics of CAS，Beijing 100080 China，Beijing 100080 China |
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| 基金项目： | 国家自然科学基金;国家自然科学基金;中国科学院知识创新工程项目;国家研究发展基金 |
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| 摘 要： | The influence of thermal states in the warm pool on tropical cyclones (TCs) in the western North Pacific (WNP) is investigated. There are fewer typhoons during warm years of the warm pool in which tropical storms tend to form in the northwest quadrant and move westward. Inversely, typhoons tend to recurve northeastward to the southeast of Japan and increase in number in the southeast quadrant during cold years. Based on composite analyses, circulation-induced dynamic factors rather than thermal factors are identified as being responsible for TCs activities. During the warm state, the monsoon trough retreats westwards, which leads to anomalous vorticity in low-level and divergence in high-level in the western part of west Pacific. Above-normal TCs activity is found in this area. Furthermore, wind anomalies at 500 hPa determine the main track types. On the contrary, when the warm pool is in cold state, the atmospheric circulation is responsible for the formation of more TCs in the southeast quadrant and recurving track.
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| 关 键 词： | 暖流 热状态 太平洋 热带旋风 |
THE EFFECT OF WARM POOL THERMAL STATES ON TROPICAL CYCLONES IN THE WESTERN NORTH PACIFIC |
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| CHEN Guang-hu,HUANG Rong-hui.THE EFFECT OF WARM POOL THERMAL STATES ON TROPICAL CYCLONES IN THE WESTERN NORTH PACIFIC[J].Journal of Tropical Meteorology,2007,13(1):53-56. |
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| Authors: | CHEN Guang-hu HUANG Rong-hui |
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| Institution: | Center for Monsoon System Research, Institute of Atmospheric Physics of CAS, Beijing 100080 China |
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| Abstract: | The influence of thermal states in the warm pool on tropical cyclones (TCs) in the western North Pacific (WNP) is investigated. There are fewer typhoons during warm years of the warm pool in which tropical storms tend to form in the northwest quadrant and move westward. Inversely, typhoons tend to recurve northeastward to the southeast of Japan and increase in number in the southeast quadrant during cold years. Based on composite analyses, circulation-induced dynamic factors rather than thermal factors are identified as being responsible for TCs activities. During the warm state, the monsoon trough retreats westwards, which leads to anomalous vorticity in low-level and divergence in high-level in the western part of west Pacific. Above-normal TCs activity is found in this area. Furthermore, wind anomalies at 500 hPa determine the main track types. On the contrary, when the warm pool is in cold state, the atmospheric circulation is responsible for the formation of more TCs in the southeast quadrant and recurving track. |
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| Keywords: | west North Pacific warm pool tropical cyclones |
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