| A STUDY ON THE VARIATIONS OF ANNUAL FREQUENCY FOR TROPICAL CYCLONE IN NORTHWEST PACIFIC DURING THE LAST HUNDRED YEARS |
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| 作者姓名： | 张光智 张先恭 魏凤英 |
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| 作者单位： | Chinese Academy of Meteorological Sciences, Beijing, 100081;Chinese Academy of Meteorological Sciences, Beijing, 100081;Chinese Academy of Meteorological Sciences, Beijing, 100081 |
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| 摘 要： | In this paper, a study on the variation of annual frequency of tropical cyclone (TC) and its relation with SST, Southern Oscillation index, sunspot relative number and number of days for specific circulation patterns was made by using 1884-1988 data of annual frequency for Northwest Pacific TC occurrence, which had been corrected to tendencies.Preliminary results indicated that in the variation of annual TC frequency there exist obvious p.6riods of 21, 31, 15 and 6 years and sustaining periods lasting 12 years in average.Well-defined processes of inflexion were observed in 1931, 1959 and 1977 over the past hundred years.The results also suggested insignificant statistic tendency of annual TC frequency increasing (decreasing) in winter/spring (summer/autumn )in the El Nino years.When the stratosphere was in the zonally westerly phase, the northern zonal circulation would abnormally develop and solar activity would enhance to favour the generation and development of TC.
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| 关 键 词： | tropical cyclone El Nino environmental variable |
| 收稿时间： | 1994/8/15 0:00:00 |
| 修稿时间： | 1994/12/27 0:00:00 |
A STUDY ON THE VARIATIONS OF ANNUAL FREQUENCY FOR TROPICAL CYCLONE IN NORTHWEST PACIFIC DURING THE LAST HUNDRED YEARS |
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| Zhang Guangzhi,Zhang Xiangong and Wei Fengying.A STUDY ON THE VARIATIONS OF ANNUAL FREQUENCY FOR TROPICAL CYCLONE IN NORTHWEST PACIFIC DURING THE LAST HUNDRED YEARS[J].Journal of Tropical Meteorology,1996,2(1):67-75. |
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| Authors: | Zhang Guangzhi Zhang Xiangong and Wei Fengying |
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| Institution: | Chinese Academy of Meteorological Sciences, Beijing, 100081;Chinese Academy of Meteorological Sciences, Beijing, 100081;Chinese Academy of Meteorological Sciences, Beijing, 100081 |
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| Abstract: | In this paper, a study on the variation of annual frequency of tropical cyclone (TC) and its relation with SST, Southern Oscillation index, sunspot relative number and number of days for specific circulation patterns was made by using 1884-1988 data of annual frequency for Northwest Pacific TC occurrence, which had been corrected to tendencies.Preliminary results indicated that in the variation of annual TC frequency there exist obvious p.6riods of 21, 31, 15 and 6 years and sustaining periods lasting 12 years in average.Well-defined processes of inflexion were observed in 1931, 1959 and 1977 over the past hundred years.The results also suggested insignificant statistic tendency of annual TC frequency increasing (decreasing) in winter/spring (summer/autumn )in the El Nino years.When the stratosphere was in the zonally westerly phase, the northern zonal circulation would abnormally develop and solar activity would enhance to favour the generation and development of TC. |
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| Keywords: | tropical cyclone El Nino environmental variable |
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