A numerical study of the interaction between two simultaneous storms: Goni and Morakot in September 2009 |
| |
| Authors: | WU Xian FEI Jianfang HUANG Xiaogang ZHANG Xiang CHENG Xiaoping REN Jianqi |
| |
| Affiliation: | Ocean-Hydrometeorology Center of Navy, Beijing 100161, Institute of Meteorology, PLA University of Science and Technology, Nanjing 211101,Institute of Meteorology, PLA University of Science and Technology, Nanjing 211101,Institute of Meteorology, PLA University of Science and Technology, Nanjing 211101,Ocean-Hydrometeorology Center of Navy, Beijing 100161,Institute of Meteorology, PLA University of Science and Technology, Nanjing 211101,Institute of Meteorology, PLA University of Science and Technology, Nanjing 211101 |
| |
| Abstract: | Significant anomalous tracks were observed when the severe tropical storm
Goni (0907) and typhoon Morakot (0908) in September 2009 were evaluated in short
distances. The relationship between the two is regarded as a case of binary
interaction. Based on an MM5 model (fifth-generation mesoscale model of
Pennsylvania State University-National Center for Atmospheric Research), in
this study a series of sensitivity experiments were designed to determine
the binary interaction between them. The sensitivity of the storm
characteristics to the binary interaction was demonstrated through modeling
experiments with different TC intensities and sizes based on the bogus
vortices initialization. Furthermore, the contributions of large-scale
environmental flow and the effects of interaction between the motions of the
cyclones were distinguished by numerical experiments using only one of the
TC vortices.
Results from these experiments show that Morakot (0908) had a greater impact on the
motion of Goni (0907), whereas Goni (0907) had a relatively limited impact on Morakot (0908). At the
upper level, the northeasterly jet flow in the third quadrant of Morakot (0908)
enhanced the upper-level divergence of Goni (0907) and had an important role in
maintaining and increasing Goni's (0907) intensity. And at the lower level, Morakot (0908),
with strong convergence and ascending airflow, made a stable transport channel
of southwesterly warm and wet flow, thus supporting the lower-level water vapor
convergence of Goni (0907). Goni (0907), which was located upriver of the southwesterly flow,
intercepted part of the water vapor transportation in the southwesterly flow,
causing the water vapor convergence to strengthen while the water vapor
convergence of Morakot (0908) weakened. |
| |
| Keywords: | binary tropical cyclones interaction numerical experiments |
| 本文献已被 CNKI SpringerLink 等数据库收录！ |
| 点击此处可从《大气科学进展》浏览原始摘要信息 |
|
点击此处可从《大气科学进展》下载全文 |
|
