| 热带季节内振荡对西北太平洋台风生成的大尺度环境的影响 |
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| 引用本文： | 周伟灿,沈海波,赵海坤.热带季节内振荡对西北太平洋台风生成的大尺度环境的影响[J].大气科学学报,2015,38(6):731-741. |
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| 作者姓名： | 周伟灿 沈海波 赵海坤 |
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| 作者单位： | 气象灾害教育部重点实验室(南京信息工程大学), 江苏南京 210044;南京信息工程大学气象灾害预报预警与评估协同创新中心, 江苏南京 210044;气象灾害教育部重点实验室(南京信息工程大学), 江苏南京 210044;气象灾害教育部重点实验室(南京信息工程大学), 江苏南京 210044;南京信息工程大学太平洋台风研究中心, 江苏南京 210044 |
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| 基金项目： | 国家自然科学基金资助项目(41475091;41305050);江苏省研究生培养创新工程资助项目(KYLX_0832) |
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| 摘 要： | 基于澳大利亚气象局发布的RMM(Real-time Multivariate Madden-Julian oscillation)指数,将热带大气季节内振荡划分为8个位相,统计分析了各位相西北太平洋台风生成频数和位置的变化特征,并进一步利用BDI(Box Difference Index)指数分析了台风生成的活跃和不活跃位相之间环境要素的差别。结果表明,相比于台风生成的不活跃位相(1、2、3位相),在利于台风生成的活跃位相(5、6、7位相)期间,环境场具有更强的低层辐合和高层辐散外流、更高的对流层中层相对湿度和更广的垂直切变较小区域。进一步研究表明,在台风生成的活跃和不活跃位相之间,大尺度环境场的差别主要体现在动力因子方面,尤其是低层辐合场。
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| 关 键 词： | 大气季节内振荡 西北太平洋 台风生成 环境因子 BDI |
| 收稿时间： | 2014/11/3 0:00:00 |
| 修稿时间： | 2015/1/12 0:00:00 |
Effect of tropical intraseasonal oscillation on large-scale enviornment of typhoon genesis over the northwestern Pacific |
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| ZHOU Wei-can,SHEN Hai-bo and ZHAO Hai-kun.Effect of tropical intraseasonal oscillation on large-scale enviornment of typhoon genesis over the northwestern Pacific[J].大气科学学报,2015,38(6):731-741. |
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| Authors: | ZHOU Wei-can SHEN Hai-bo and ZHAO Hai-kun |
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| Institution: | Key Laboratory of Meteorological Disasters(NUIST), Ministry of Education, Nanjing 210044, China;Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, NUIST, Nanjing 210044, China;Key Laboratory of Meteorological Disasters(NUIST), Ministry of Education, Nanjing 210044, China;Key Laboratory of Meteorological Disasters(NUIST), Ministry of Education, Nanjing 210044, China;Pacific Typhoon Research Center, NUIST, Nanjing 210044, China |
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| Abstract: | Based on the RMM(Real-time Multivariate Madden-Julian oscillation) index from Australia Meteorological Bureau,the tropical atmospheric intraseasonal oscillation is divided into eight phases.The variations of typhoon genesis frequency and location over the northwestern Pacific during the eight phases are statistically analyzed.It is found that more(less) typhoons generate during the active phases 5,6 and 7(the inactive phases 1,2 and 3) over the northwestern Pacific.The box difference index(BDI) is further used to investigate the differences in environmental factors between the active and inactive phases.Results show that,compared to those during the inactive phases 1,2 and 3,the stronger low level convergence and upper level divergence outflows,the higher relative humidity in middle troposphere,as well as wider areas with small vertical shear can be found during the active phases 5,6 and 7.Moreover,the most significant difference in large scale environment field between the inactive and active phases is dynamical factor,especially low level convergence field. |
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| Keywords: | atmospheric intraseasonal oscillation northwestern Pacific typhoon genesis environmental factor box difference index |
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