Thermodynamic Characteristics of Tropical Cyclones with Rapid Intensity Change over the Coastal Waters of China |
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| Authors: | Yubin Yu Xiuping Yao |
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| Institution: | (1) 4008 Beechwood Road, 20782 University Park, MD, USA |
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| Abstract: | In order to investigate the different thermodynamic mechanisms between rapid intensifying (RI) and rapid weakening (RW) tropical
cyclones (TCs), the thermodynamic structures of two sets of composite TCs are analyzed based on the complete-form vertical
vorticity tendency equation and the NCEP/NCAR reanalysis data. Each composite is composed of five TCs, whose intensities change
rapidly over the coastal waters of China. The results show that the maximum apparent heating source Q
1 exists in both the upper and lower troposphere near the RI TC center, and Q
1 gets stronger at the lower level during the TC intensification period. But for the RW TC, the maximum Q
1 exists at the middle level near the TC center, and Q
1 gets weaker while the TC weakens. The maximum apparent moisture sink Q
2 lies in the mid troposphere. Q
2 becomes stronger and its peak-value height rises while TC intensifies, and vice versa. The increase of diabatic heating with
height near the TC center in the mid-upper troposphere and the increase of vertical inhomogeneous heating near the TC center
in the lower troposphere are both favorable to the TCs’ rapid intensification; otherwise, the intensity of the TC decreases
rapidly. |
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| Keywords: | coastal waters tropical cyclone rapid intensity change thermodynamic mechanism |
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