| 超级台风‘玛莉亚’的对流爆发特征及与快速加强的关系 |
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| 作者姓名： | HENG Jian YANG Shuai GONG Yuanfa GU Jianfeng LIU Haiwen |
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| 作者单位： | School of Atmospheric Sciences;Laboratory of Cloud-Precipitation Physics and Severe Storms（LACS）;Chongqing Meteorological Administration;Department of Aviation Meteorology |
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| 基金项目： | The authors are supported by the National Natural Science Foundation of China[grant numbers 41575064,41875079,and 41775079];the Open Research Program of the State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences[grant number 2019LASW-A04]. |
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| 摘 要： | 利用数值模拟结果,该研究探讨了超级台风‘玛莉亚’的对流爆发(CBs)特征及与快速加强(RI)的关系。发现,(1)切变相对象限的内核CBs表现为由顺切变到逆切变的气旋式旋转,这有利于台风快速加强;(2)CBs的突然增长为即将到来的RI提供了预示性特征信号,同时,台风玛莉亚的RI过程引发剧烈的深对流;(3)自对流层底向上的对流增长角度分析,发现对流爆发与边界层高对流有效位能,次级环流的向上深层发展,增强的动量通量辐合等有关。
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| 关 键 词： | 对流爆发 快速加强 台风 天气学条件 |
Characteristics of the convective bursts and their relationship with the rapid intensification of Super Typhoon Maria(2018) |
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| HENG Jian,YANG Shuai,GONG Yuanfa,GU Jianfeng,LIU Haiwen.Characteristics of the convective bursts and their relationship with the rapid intensification of Super Typhoon Maria(2018)[J].Atmospheric and Oceanic Science Letters,2020(2):146-154. |
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| Abstract: | For Super Typhoon Maria(2018),the multi-intensity change stages are identified and reproduced by numerical simulation.It is rather difficult to perform a perfect simulation for such a repeatedly reinforced typhoon during its long life-cycle and remote path.In this study,the rapid intensification(RI)episode is focused on to investigate the convective burst(CB)characteristics and the relationship between the CBs and the RI of Maria.For Typhoon Maria,1)the spatial pattern of the inner-core CBs in distinct shear-relative quadrants,instead of the overall inner-core CBs frequently used in previous studies,presents cyclonic rotation from downshear to upshear quadrants during RI,producing a higher efficiency for tropical cyclone(TC)spinup,which accelerates the RI process.2)Dual meanings/relationships exist between CBs and RI for Maria,in contrast to the previous argument that CBs might be an indicator or a precursor to RI.The sudden growth of CBs prior to RI provides a precursor for the upcoming RI.Additionally,the appearance of the CB peak soon after RI indicates RI could lead to more intensive deep convections.The overlap of CBs with high inertial stability inside the radius of maximum wind plays a significant role in the RI of TCs.3)The synoptic attributions to CBs are also explored for the entire troposphere,fitting in the bottom-up thinking of convection growth.The CBs might be associated with high convective available potential energy in the boundary layer,a strengthening of the deep-layer secondary circulation,and an enhanced upper-level eddy momentum flux convergence. |
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| Keywords: | Convective bursts rapid intensification typhoon synoptic conditions |
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