Abstract
In this study, the interaction between the tropical cyclone (TC) and the underlying ocean is reproduced by using a coupled atmosphere-ocean model. Based on the simulation results, characteristics of the TC boundary layer depth are investigated in terms of three commonly used definitions, i.e., the height of the mixed layer depth (HVTH), the height of the maximum tangential winds (HTAN), and the inflow layer depth (HRAD). The symmetric height of the boundary layer is shown to be cut down by the ocean response, with the decrease of HVTH slightly smaller than that of HTAN and HRAD. The ocean feedback also leads to evident changes in asymmetric features of the boundary layer depth. The HVTH in the right rear of the TC is significantly diminished due to presence of the cold wake, while the changes of HVTH in other regions are rather small. The decreased surface virtual potential temperature by the cold wake is identified to be dominant in the asymmetric changes in HVTH. The impacts of ocean response on the asymmetric distributions of HTAN are nonetheless not distinct, which is attributed to the highly axisymmetric property of tangential winds. The HRAD possesses remarkable asymmetric features and the inflow layer does not exist in all regions, an indication of the inadequacy of the definition based on symmetric inflow layer depth. Under influences of the cold wake, the peak inflow area rotates counterclockwise distinctly. As a consequence, the HRAD becomes deeper in the east while shallower in the west of the TC.
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Supported by the China Meteorological Administration Special Public Welfare Research Fund (GYHY201106004) and National Natural Science Foundation of China (41230421, 41005029, and 41105065).
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Ma, Z., Fei, J., Huang, X. et al. Evaluation of the ocean feedback on height characteristics of the tropical cyclone boundary layer. Acta Meteorol Sin 27, 910–922 (2013). https://doi.org/10.1007/s13351-013-0611-z
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DOI: https://doi.org/10.1007/s13351-013-0611-z