Diagnosis and Analysis of Explosive Cyclones Affecting the Safety of Ship Navigation
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Guo Yana, Ding Zhenguo
According to the final purpose analysis data provided by the National Environmental Prediction Center, the grid data of the second version of NCEP climate prediction system, and the infrared satellite cloud data provided by the tropical depression center of the United States, the explosive tropical storm occurred in the Northwest Pacific in January 2015. The evolution process and circulation of the system are analyzed. Using high resolution satellite cloud image data, the "eye" structure of the "spiral snake" distribution formed in the development of tropical storms is analyzed. The results show that there is a surface storm center in the front of 500 hPa cyclone during the development of tropical storm. The strong positive vorticity flow and the explosion of atmospheric pressure develop. The divergence caused by high-altitude jet and low-level water vapor transport plays an important role in the explosive development of tropical storms. During the development of this tropical storm, the structure of tropical low pressure is similar to its "eyes", with "warm heart" structure and sinking moving area with eyes. In the first six hours when the tropical storm reaches maturity, the satellite cloud image appears as the center of the tropical storm. The cloud rotates inward several times in the eye to form a "spiral snake.". The distribution of the cloud system on the satellite cloud image is related to the horizontal distribution of the potential vorticity in the center of the high-altitude tropical storm. The cloud system is the reflection of the dynamic effect of the high-altitude vorticity.
Explosive Cyclone, Weather Situation Analysis, Potential Vorticity, Eye Structure