| A STATISTICAL ANALYSIS ON INTENSITY CHANGE OF TROPICAL CYCLONES OVER THE WESTERN NORTH PACIFIC |
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| 作者姓名： | 于玉斌 姚秀萍 |
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| 作者单位： | [1]Chinese Academy of Meteorological Sciences, Beij ing 100081 China [2]Nanj ing University of Information Science ＆ Technology, Nanj ing 210044 China [3]China Meteorological Administration Training Center, Beij ing 100081 China |
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| 基金项目： | 国家自然科学基金;中国气象局气候变化专项基金 |
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| 摘 要： | 55-year (1949 - 2003) data sets are used to study the statistical characteristics in intensity change of the tropical cyclones (TC) over the western North Pacific. According to the mathematical meaning of average value and standard deviation, the abruptly intensifying, gradually intensifying, stable intensity, gradually weakening and abruptly weakening of TC intensity are defined and the statistical characteristics, such as inter-decadal variation, inter-annual variation, inter-monthly variation, and regional distribution, etc. are analyzed. Main results are as follows: (1) From 1949 to 2003, there were 1886 TCs, averaging at 34.29 TCs per year. After 1995, the number of TCs dropped dramatically with less than 30 per year. 3.56% of the total were abruptly intensifying samples, and 3.31% were weakening samples. (2) For the annual mean, all but the stable group tend to decrease with the shift of decades as far as the overall change of the 6-h isallobaric process is concerned. (3) The abruptly intensifying TC seldom occurs over mid- and high-latitude area (north of 30°N) and low-latitude area and sometimes occurs around the islands and continent. Basically there is no gradually intensifying of TC over mid- and high- latitude area (north of 30°N and west of 125°E), in offshore Chinese waters. The gradually weakening and abruptly weakening TCs usually occur offshore China, west of 125 °E, but seldom over low-latitude area (0 - 5°N).
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| 关 键 词： | 统计分析 强度 热带旋风 热带气象 |
A STATISTICAL ANALYSIS ON INTENSITY CHANGE OF TROPICAL CYCLONES OVER THE WESTERN NORTH PACIFIC |
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| YU Yu-bin,YAO Xiu-ping.A STATISTICAL ANALYSIS ON INTENSITY CHANGE OF TROPICAL CYCLONES OVER THE WESTERN NORTH PACIFIC[J].Journal of Tropical Meteorology,2007,13(1):14-16. |
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| Authors: | YU Yu-bin YAO Xiu-ping |
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| Abstract: | 55-year (1949 - 2003) data sets are used to study the statistical characteristics in intensity change of the tropical cyclones (TC) over the western North Pacific. According to the mathematical meaning of average value and standard deviation, the abruptly intensifying, gradually intensifying, stable intensity,gradually weakening and abruptly weakening of TC intensity are defined and the statistical characteristics,such as inter-decadal variation, inter-annual variation, inter-monthly variation, and regional distribution, etc.are analyzed. Main results are as follows: (1) From 1949 to 2003, there were 1886 TCs, averaging at 34.29 TCs per year. After 1995, the number of TCs dropped dramatically with less than 30 per year. 3.56% of the total were abruptly intensifying samples, and 3.31% were weakening samples. (2) For the annual mean, all but the stable group tend to decrease with the shift of decades as far as the overall change of the 6-h isallobaric process is concerned. (3) The abruptly intensifying TC seldom occurs over mid- and high-latitude area (north of 30°N) and low-latitude area and sometimes occurs around the islands and continent. Basically there is no gradually intensifying of TC over mid- and high- latitude area (north of 30°N and west of 125°E),in offshore Chinese waters. The gradually weakening and abruptly weakening TCs usually occur offshore China, west of 125 °E, but seldom over low-latitude area (0 - 5°N). |
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| Keywords: | tropical cyclones intensity statistics |
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