当前位置: X-MOL 学术Adv. Atmos. Sci. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Evolution of the Mid-tropospheric Vortex during the Formation of Super Typhoon Megi (2010)
Advances in Atmospheric Sciences ( IF 5.8 ) Pub Date : 2020-06-09 , DOI: 10.1007/s00376-020-9178-7
Li Zhuo , Dexian Fang , Zheng Wu , Juan Fang

As a follow-up of a previously published article on the contribution of tropical waves, this study explores the evolution of the mid-tropospheric mesoscale cyclonic vortex (MV) during the formation of Typhoon Megi (2010) with a successful cloud-resolving simulation. It is found that the formation and intensification of the MV were related to the deep convection and subsequent stratiform precipitation, while the weakening of the MV was related to the shallow convection. Both the upward transport of vorticity related to the deep convection and the horizontal convergence associated with the stratiform precipitation contributed to the formation and intensification of the MV. Even though the latter was dominant, the former could not be ignored, especially in the early stage of the MV. The MV played dual roles in the formation of Megi. On the one hand, the formation and intensification of MV were primarily associated with the stratiform precipitation, which induced the low-level divergence inhibiting the spin-up of the near-surface cyclonic circulation. On the other hand, the coupled low-level cold core under the MV benefited the accumulation of the convective available potential energy (CAPE), which was favorable for the convective activity. A sensitivity experiment with the evaporative cooling turned off indicated that the development of the MV retarded the genesis process of Megi. 利用高精度数值模拟资料, 本文分析了超强台风 “鲇鱼” 形成过程中中层涡旋的发展和演变. 研究结果表明, 中层涡旋的形成和发展与深对流和随后的层云有关, 而其减弱则与浅对流的发展有关. 层云产生的中层辐合和深对流引起的垂直方向上涡度输送都对中层涡旋的形成有着贡献. 其中, 前者起主要作用, 但后者的作用也是不可忽略的, 尤其是在中层涡旋发展的早期阶段。 进一步的分析表明, 中层涡旋的形成与发展对 “鲇鱼” 的形成具有双重影响. 一方面, 中层涡旋的形成伴随着明显的低层辐散, 导致低层气旋性环流减弱; 另一方面, 与中层涡旋耦合的低层冷心加大了大气的不稳定, 有利于对流的爆发. 敏感性试验进一步表明, 中层涡旋的发展对 “鲇鱼” 的形成过程有抑制作用.

中文翻译:

超级台风 Megi (2010) 形成期间对流层中涡的演变

作为先前发表的关于东风波贡献的文章的后续,本研究通过成功的云解析模拟,探讨了台风 Megi (2010) 形成期间对流层中尺度气旋涡 (MV) 的演变。发现MV的形成和增强与深层对流和随后的层状降水有关,而MV的减弱与浅对流有关。与深层对流相关的涡量向上传输和与层状降水相关的水平辐合都有助于MV的形成和增强。虽然后者占优势,但前者也不容忽视,尤其是在MV初期。MV在Megi的形成过程中扮演了双重角色。一方面,MV的形成和增强主要与层状降水有关,层状降水引起低层辐散,抑制了近地表气旋环流的自旋。另一方面,MV下耦合的低层冷核有利于对流可用势能(CAPE)的积累,有利于对流活动。关闭蒸发冷却的敏感性实验表明,MV 的发展延迟了 Megi 的起源过程。利用大量数值模拟资料,本文分析了强台风“鲇鱼”形成过程中层涡旋的发展和成长。研究结果证实,中层旋流的形成和发展与深水涡流和随后的层云有关,其减弱则与浅对流的发展有关。层云产生的中层涡旋合和深对流形成的垂直方向上涡度输送都对中层涡旋的形成。继后来开始主要作用,但是的作用也是不可理解的,尤其是在中层涡旋发展的早期阶段。 进一步的分析,中层涡旋的形成与发展对“鲇鱼”的形成具有重要影响。 . 一方面,中层涡旋的形成伴随着明显的低层旋散,导致低层气性环流减弱;另一方面,与中层涡旋的低层冷心膨胀了大气压的稳定,有观察对流的爆发。试验进一步证明,
更新日期:2020-06-09
down
wechat
bug