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| How Does Tropical Cyclone Size Affect the Onset Timing of Secondary Eyewall Formation? |
| Liang GUAN1,2 and Xuyang GE1 |
1. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory of Meteorological Disaster, Nanjing University of Information Science & Technology, Nanjing 210044;
2. Shanghai Meteorological Science and Technology Service Center, Shanghai 200030 |
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Abstract By using idealized numerical simulations, the impact of tropical cyclone size on secondary eyewall formation (SEF) is examined. Both unbalanced boundary layer and balanced processes are examined to reveal the underlying mechanism. The results show that a tropical cyclone (TC) with a larger initial size favors a quicker SEF and a larger outer eyewall. For a TC with a larger initial size, it will lead to a stronger surface entropy flux, and thus more active outer convection. Meanwhile, a greater inertial stability helps the conversion from diabatic heating to kinetic energy. Furthermore, the progressively broadening of the tangential wind field will induce significant boundary layer imbalances. This unbalanced boundary layer process results in a supergradient wind zone that acts as an important mechanism for triggering and maintaining deep convection. In short, different behaviors of balanced and unbalanced processes associated with the initial wind profile lead to different development rates of the secondary eyewall.
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Received: 09 March 2017
Published Online: 19 October 2017
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| Supported by: Supported by the National Natural Science Foundation of China (41575056, 41730961, and 41775058) and National (Key) Basic Research and Development (973) Program of China (2015CB452803) |
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Corresponding Authors:
Xuyang GE
E-mail: xuyang@nuist.edu.cn
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