| 摘要 |
Based on the ERA-5 reanalysis data provided by the European Centre for Medium-Range Weather Forecasts (ECMWF), the development mechanisms of explosive cyclones in the Kuroshio Current area from 2000 to 2015 were classified, and the characteristics of these explosive cyclones were analyzed by using diagnostic analysis, statistical analysis and linear fitting analysis methods. The results show that absolute vorticity advection, temperature advection, and non-adiabatic heating were the three main factors affecting the explosive development of cyclones. The development mechanisms of explosive cyclones in the Kuroshio Current area can be classified into three major categories, that is, the explosive cyclones were dominated by a single factor, two factors, or multiple factors. The explosive cyclones dominated by a single factor were mainly weak or medium, while there were fewer strong explosive cyclones and no super explosive cyclones. Among these explosive cyclones, the explosive cyclones dominated by absolute vorticity advection were the weakest, while the strongest explosive cyclones were dominated by non-adiabatic heating. The proportion of strong and supper explosive cyclones dominated by two factors was over 60%. The combination of two factors was more likely to generate strong explosive cyclones than the single-factor dominant type and the combination of three factors, among which the impact was the greatest under the combined effect of temperature advection and non-adiabatic heating. Through statistical analysis, it is concluded that non-adiabatic heating contributed the most to the explosive development of cyclones in the Kuroshio Current area, while vorticity advection had the least impact, and temperature advection had a considerable effect. In terms of seasonal characteristics, the explosive cyclones in the Kuroshio Current area mostly appeared in spring, followed by winter, while there were basically no explosive cyclones in summer and autumn. |
