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《SCIENTIA ATMOSPHERICA SINICA》 1996-01
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A Study on the Dynamic Features and Energy Conversion of the Development of Explosive Cyclones

Lu Xiaoying and Sun Shuqing(Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100080)  
A study on the dynamic features and energy conversion for two cases of explosive cyclones with different tracks is done in present work.It is found that the air with high potential vorticity in the upper troposphere extends downward.The nascent cyclone moves towards the area beneath it,forming a column of high value of potential vorticity.It is certainly favourable to the drastic development of the cyclone.It is also clear that there exists a close relation between the upper level jet and the development of the explosive cyclone.A developing cyclone moves obviously to the divergence area on the left side of the jet.The sudden increase of wind velocity in the jet occurs before the strengthening of the cyclone,which brings about a large amount of momentum transferring downward to form a strong wind belt and a jet structure with a strong horizontal gradient of wind velocity in the lower troposphere.By analyzing the energy conversion during the evolution of the explosive cyclone,it is indicated that the conversion of kinetic energy from divergence winds parts Kχ to rotation winds parts Kψ occurs in the cyclone region through the whole period of its development,especially in its early stage.It is verified that the divergence winds kinetic energy Kχ and its conversion to the rotational winds kinetic energy Kψ plays an important role in the explosive development of the cyclone.A comparison is also made between two explosive cyclones with different tracks.
【CateGory Index】: P444
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