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Abstract:
By using data of serially numbered typhoons in northwestern Pacific and NOAA OLR data and NCEP/NCAR reanalysis data of wind field, based on the statistics and study of the relationship between the calendar years with more (or fewer) summer typhoons and ENSO events, we compared the composites of OLR eigenvectors and tropical summer wind fields during El Nino and La Nina events with more or fewer than normal summer typhoons, respectively. The results show that, in summer, without remarkable systematic anomalies of Mascarene High and Australia High in South Hemisphere, the anomaly of Walker circulation will dominate and follow the rule of ENSO impacts to atmospheric circulation and typhoon frequency. Otherwise, when systematic anomalies of Australia High appear during the El Nino events, circulation anomalies in the South Hemisphere will dominate, and many more typhoons will occur. In 1999, which is a special year of La Nina events, northward and eastward monsoon was induced by the stronger Mascarene High, and fewer typhoons arose. The typhoon source are regions where weak vertical wind shear, warm pool in western Pacific and the area with monsoon troughs are overlapping with each other. Finally, this paper analyzes and compares the source locations and ranges of more (fewer) typhoons in the events of El Nino and La Nina, respectively.
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References
|
[1]
|
LI Xian-zhi, The Composite theory about typhoon genesis[J]. Acta Meteorological Sinica, 1956, 27(1)：87-100.. |
|
[2]
|
TAO Shi-Yan, DONG Ke-qin, The relationship betweenWest Pacific Typhoon Activity Frequency and AtmosphericCirculation [M]// Study on some questions about Chinesesubtropical synoptic system. Beijing：Science Press, 1963: 2-9. |
|
[3]
|
LI Zeng-zhong A preliminary analysis of relationshipbetween the equatorial westerlies and the formation oftyphoons [C]//1983 annual national conference symposia.Shanghai：Science and Technology Press 1986: 49-61. |
|
[4]
|
CHEN Lian-shou, DING Yi-hui. The Introduction toTyphoons in West Pacific [M]. Beijing: Science Press, 1979,64-145. |
|
[5]
|
HE Jing-hai, YU Jing-jing, SHEN Xin-rong, et al. Researchon mechanism and variability of east Asian monsoon [J].Journal of Tropical Meteorology, 2004, 20(5): 449-459. |
|
[6]
|
SUN Xiu-rong, DUAN Yi-hong. A Study of theRelationships between the East Asian Summer Monsoon andthe Tropical Cyclone Frequency in the Northwestern PacificChinese Journal of Atmospheric Sciences [J]. Chinese Journalof Atmospheric Sciences, 2003, 27 (1): 67-74. |
|
[7]
|
LI Chong-yin. A study on the influence of El Ni?o upontyphoon action over western pacific [J]. Acta MeteorologicaSinica, 1987, 45 (2): 229-235. |
|
[8]
|
HE Min, SONG Wen-ling, CHEN Xing-fang. El Ni?o andanti- El Ni?o events and the activity of northwest Pacifictyphoons [J]. Journal of Tropical Meteorology, 1999, 15 (1):17-25. |
|
[9]
|
LI Xiao-yan. ZAI Pan-mao. On indices and indicators ofENSO episodes [J]. Acta Meteorologica Sinica, 2000, 58(1):102-109. |
|
[10]
|
WANG Shao-wu, GONG Dao-yi. ENSO events and theirintensity during the past century [J]. Meteorological Monthly,1999, 25 (1): 9-15. |
|
[11]
|
CHEN Hai-shan, SUN Zhao-bo, NI Dong-hong. Possibleimpacts of nino c ssta on winter atmospheric generalcirculation over east Asia [J]. Journal of Tropical Meteorology,2002, 18 (2): 148-156. |
|
[12]
|
DING Y H, REITER E R. Some conditions influencing thevariability of typhoon formation over the West Pacific Ocean[J].Arch Met Geoph Biokl Ser A, 1981, 30: 327-342. |
|
[13]
|
CHAN T C, WENG S P. Interannual variation in thetropical cyclone formation over the western North Pacific [J].MonthlyWeather Review, 1998, 126: 1080-1090. |
|
[14]
|
CHEN Min, ZHENG Yong-guang, TAO Zu-yu. Reanalysisof the climatological characteristics of tropical cyclones inNorthwest Pacific over the last 50 years (1949-1996)[J].Journal of Tropical Meteorology, 1999, 15 (1): 10-16. |
|
[15]
|
LI Xiao-yan. A diagnostic study of 1998/2000 ENSO coldepisode [J]. Journal of Tropical Meteorology, 2001, 17 (1): 90-96. |
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