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Advances in Atmospheric Sciences

, Volume 34, Issue 6, pp 757–770 | Cite as

A high-resolution simulation of Supertyphoon Rammasun (2014)—Part I: Model verification and surface energetics analysis

  • Xinghai Zhang
  • Yihong Duan
  • Yuqing Wang
  • Na Wei
  • Hao Hu
Original Paper

Abstract

A 72-h high-resolution simulation of Supertyphoon Rammasun (2014) is performed using the Advanced Research Weather Research and Forecasting model. The model covers an initial 18-h spin-up, the 36-h rapid intensification (RI) period in the northern South China Sea, and the 18-h period of weakening after landfall. The results show that the model reproduces the track, intensity, structure of the storm, and environmental circulations reasonably well. Analysis of the surface energetics under the storm indicates that the storm’s intensification is closely related to the net energy gain rate (ε g), defined as the difference between the energy production (P D) due to surface entropy flux and the energy dissipation (D S) due to surface friction near the radius of maximum wind (RMW). Before and during the RI stage, the ε g is high, indicating sufficient energy supply for the storm to intensify. However, the ε g decreases rapidly as the storm quickly intensifies, because the DS increases more rapidly than the P D near the RMW. By the time the storm reaches its peak intensity, the D S is about 20% larger than the P D near the RMW, leading to a local energetics deficit under the eyewall. During the mature stage, the P D and D S can reach a balance within a radius of 86 km from the storm center (about 2.3 times the RMW). This implies that the local P D under the eyewall is not large enough to balance the D S, and the radially inward energy transport from outside the eyewall must play an important role in maintaining the storm’s intensity, as well as its intensification.

Key words

Rammasun (2014) high-resolution simulation energetics analysis rapid intensification 

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Notes

Acknowledgments

This study was supported by the National Basic Research and Development Project (973 program) of China (Grant No. 2015CB452805) and the National Natural Science Foundation of China (Grant No. 41375068). Yuqing WANG was partly supported by the National Science Foundation (Grant No. AGS-1326524).

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Copyright information

© Chinese National Committee for International Association of Meteorology and Atmospheric Sciences, Institute of Atmospheric Physics, Science Press and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Xinghai Zhang
    • 1
    • 2
  • Yihong Duan
    • 1
  • Yuqing Wang
    • 1
    • 3
  • Na Wei
    • 1
  • Hao Hu
    • 1
  1. 1.State Key Laboratory of Severe Weather in Chinese Academy of Meteorological SciencesChina Meteorological AdministrationBeijingChina
  2. 2.University of Chinese Academy of SciencesBeijingChina
  3. 3.International Pacific Research Center and Department of Atmospheric Sciences, School of Ocean and Earth Science and TechnologyUniversity of Hawaii at MānoaHonolulu, HawaiiUSA

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