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气象:2019,45(7):920-930
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西北太平洋热带气旋活动对夏秋型ENSO事件的响应
涂石飞,徐峰,常舒捷,季倩倩,张羽
(广东海洋大学南海海洋气象研究院,湛江 524088; 广东海洋大学海洋与气象学院,湛江 524088; 广东省气候中心,广州 510640)
Response of Tropical Cyclone in the Northwest Pacific for Summer and Autumn ENSO Events
TU Shifei,XU Feng,CHANG Shujie,JI Qianqian,ZHANG Yu
(South China Sea Institute of Marine Meteorology, Guangdong Ocean University, Zhanjiang 524088; College of Oceanography and Meteorology, Guangdong Ocean University, Zhanjiang 524088; Guangdong Climate Center, Guangzhou 510640)
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投稿时间:2018-03-19    修订日期:2019-04-08
中文摘要: 利用西北太平洋热带气旋(tropical cyclone,TC)历史路径资料、ERA Interim再分析资料以及海洋Ni〖AKn~D〗o指数ONI等,采用合成分析等统计学方法探讨了TC活动对夏季(SU型)与秋季(AU型)ENSO事件的不同响应。结果表明:在SU型El Ni〖AKn~D〗o期间,西北太平洋TC强度与持续时间增大,强台风活动较多; 在AU型El Ni〖AKn~D〗o发生时,TC持续时间及强度均大于SU型的频数也较之偏少,但超强台风活动较多,约占TC总数的1/3,生成位置也较SU型偏东,但登陆我国的TC频数较少。在SU型La Ni〖AKn~D〗a期间,TC强度、持续时间较小,以低等级TC活动为主,活动位置整体偏西。当AU型La Ni〖AKn~D〗a发生时,TC强度、持续时间以及强等级TC频数均大于SU型,且TC活动位置相对SU型偏东。中太平洋地区相对涡度异常、大气垂直风切变、SSTA等条件差异是SU型与AU型ENSO期间TC活动产生差异的重要方面,副热带高压强度及位置变化对TC活动也有较大影响。
Abstract:Based on historical track data of tropical cyclones (TC) in Northwest Pacific, 〖JP2〗ERA Interim reana〖JP〗 lysis dataset and oceanic Ni〖AKn~D〗o indices, the characteristics of tropical cyclones in the Northwest Pacific during the two types of ENSO period are discussed by using statistical methods. The results indicate that the intensity and duration of TC are increasing and severe typhoon activities are more frequent over the Northwest Pacific in summer (SU) El Ni〖AKn~D〗o period. During the occurrence of autumn (AU) El Ni〖AKn~D〗o, the duration and intensity of TC are longer and larger than those generated in SU El Ni〖AKn~D〗o, and the frequency of TC is lower, but the number of super typhoons accounts for one third of total TC, with fewer of TCs landing in China. In addition, the formation positions of TC are more eastward than SU El Ni〖AKn~D〗o. However, the intensity and duration of TC are smaller and shorter, with more low level TCs generated in the SU La Ni〖AKn~D〗a epoch. When the AU La Ni〖AKn~D〗a occurs, the intensity, duration, and TC strength are slightly larger and the generation location is eastward than those TC generated in SU La Ni〖AKn~D〗a period. Further more, it is found that the differences of relative vorticity, vertical shear and SSTA in the Central Pacific are important reasons for the diversification of TC activities during the two types of ENSO, and the intensity and position of subtropical high also have a greater impact on TC activity.
文章编号:     中图分类号:P429,P447    文献标志码:
基金项目:国家重点研发计划(2018YFA0605604)、国家自然科学基金项目(41475120)和广东省自然科学基金重大基础研究培育项目(2015A03030801)共同资助
引用文本:
涂石飞,徐峰,常舒捷,季倩倩,张羽,2019.西北太平洋热带气旋活动对夏秋型ENSO事件的响应[J].气象,45(7):920-930.
TU Shifei,XU Feng,CHANG Shujie,JI Qianqian,ZHANG Yu,2019.Response of Tropical Cyclone in the Northwest Pacific for Summer and Autumn ENSO Events[J].Meteor Mon,45(7):920-930.