| The characteristic differences of tropical cyclones forming over the western North Pacific and the South China Sea |
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| 作者姓名： | YUAN Jinnan WANG Dongxiao LIU Chunxi HUANG Jian HUANG Huijun |
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| 作者单位： | YUAN Jinnan1，WANG Dongxiao2，LIU Chunxia1，HUANG Jian1，HUANG Huijun11.Key Open Laboratory for Tropical Monsoon，Guangzhou Institute of Tropical and Marine Meteorology，China Meteorological Administration，Guangzhou 510080，China 2.Laboratory for Tropical Marine Environmental Dynamics，South China Sea Institute of Oceanology，Chinese Academy of Sciences，Guangzhou 510301，China |
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| 基金项目： | the China Meteorological Administration
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中国科学院基金
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国家自然科学基金 |
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| 摘 要： | The best track dataset of tropical cyclones in the western North Pacific (WNP) and the South China Sea (SCS) from 1977 to 2005 during the satellite era, the NCEP/NCAR reanalysis dataset and the extended reconstructed sea surface temperature dataset are employed in this study. The main climatological characteristics of tropical cyclone formation over the WNP and the SCS are compared. It is found that there is obviously different for the locations of tropical cyclone origins, achieving the lowest central pressure and termination points between over the WNP and over the SCS. The annual number of tropical cyclones forming over the SCS is obviously less than over the WNP, and there is a significant negative correlation with the correlation coefficient being -0.36 at the 5% significance level between over the WNP and over the SCS. The mean speed of tropical cyclone moving is 6.5 m /s over the WNP and 4.6 m /s over the SCS. The mean lowest central pressure of tropical cyclones is obviously weaker over the SCS than over the WNP. The tropical cyclone days per year, mean total distance and total displacement of tropical cyclone traveled over the WNP are all obviously longer than those over the SCS. Tropical cyclone may intensify to Saffir-Simpson hurricane scale 5 over the WNP, but no tropical cyclone can intensify to Saffir-Simpson hurricane scale 3 over the SCS. The changing ranges of the radii(R15,R16) of the 15.4 m /s winds them and the 25.7 m /s winds over the WNP are obviously wider than those over the SCS, and the median values of the radii over the WNP are also larger than those over the SCS. For the same intensity of tropical cyclones, both radii have larger medians over the WNP than over the SCS. The correlations of annual mean tropical cyclone size parameters between over the WNP and over the SCS are not significant. At the same time, the asymmetric radii of tropical cyclones over the WNP are different from those over the SCS.
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| 关 键 词： | 热带气旋 太平洋西北部 南中国海 海洋气候学 |
| 收稿时间： | 2/5/2007 12:00:00 AM |
| 修稿时间： | 2007-02-05 |
The characteristic differences of tropical cyclones forming over the western North Pacific and the South China Sea |
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| YUAN Jinnan,WANG Dongxiao,LIU Chunxi,HUANG Jian,HUANG Huijun.The characteristic differences of tropical cyclones forming over the western North Pacific and the South China Sea[J].Acta Oceanologica Sinica,2007,26(4):29-43. |
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| Authors: | YUAN Jinnan WANG Dongxiao LIU Chunxi HUANG Jian and HUANG Huijun |
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| Institution: | 1.Key Open Laboratory for Tropical Monsoon, Guangzhou Institute of Tropical and Marine Meteorology, China Meteorological Administration, Guangzhou 510080, China2.Laboratory for Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China |
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| Abstract: | The best track dataset of tropical cyclones in the western North Pacific (WNP) and the South China Sea (SCS) from 1977 to 2005 during the satellite era, the NCEP/NCAR reanalysis dataset and the extended reconstructed sea surface temperature dataset are employed in this study. The main climatological characteristics of tropical cyclone formation over the WNP and the SCS are compared. It is found that there is obviously different for the locations of tropical cyclone origins, achieving the lowest central pressure and termination points between over the WNP and over the SCS. The annual number of tropical cyclones forming over the SCS is obviously less than over the WNP, and there is a significant negative correlation with the correlation coefficient being -0.36 at the 5% significance level between over the WNP and over the SCS. The mean speed of tropical cyclone moving is 6.5 m /s over the WNP and 4.6 m /s over the SCS. The mean lowest central pressure of tropical cyclones is obviously weaker over the SCS than over the WNP. The tropical cyclone days per year, mean total distance and total displacement of tropical cyclone traveled over the WNP are all obviously longer than those over the SCS. Tropical cyclone may intensify to Saffir-Simpson hurricane scale 5 over the WNP, but no tropical cyclone can intensify to Saffir-Simpson hurricane scale 3 over the SCS. The changing ranges of the radii(R15,R16) of the 15.4 m /s winds them and the 25.7 m /s winds over the WNP are obviously wider than those over the SCS, and the median values of the radii over the WNP are also larger than those over the SCS. For the same intensity of tropical cyclones, both radii have larger medians over the WNP than over the SCS. The correlations of annual mean tropical cyclone size parameters between over the WNP and over the SCS are not significant. At the same time, the asymmetric radii of tropical cyclones over the WNP are different from those over the SCS. |
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| Keywords: | characteristic differences tropical cyclone western North Pacific and South China Sea |
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