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Using mesoscale eddy trajectory product from 1993 to 2019 provided by the AVISO, this study analyzes the climatology characteristics and seasonal variations of mesoscale eddies in the Andaman Sea (AS). The results show that a total of 328 mesoscale eddies were generated in the AS during the past 27 years, of which anticyclonic eddies (AEs) (171) were more than cyclonic eddies (CEs) (157). The eddies are mainly distributed in the deep waters of the central and western basin of the AS. The average life span of total eddies is 46.4 days, with average eddy radius of 111.8 km, average amplitude of 4.7 cm, rotating and propagating speeds of 24.8 cm/s and 15.0 cm/s, respectively. The AEs have large radius, amplitude, and rotating speed than CEs, but smaller propagating speed. During the eddy life, the composite radius, amplitude, and rotating speed of eddies all increase in the generation stage and then decrease in dissipation stage, while the eddy propagation speed has opposite trend. For the seasonal variation, the comparison of AEs to CEs shows seesaw phenomena in winter and summer, CEs are stronger and larger than AEs in summer, but weaker and smaller in winter. The distribution of AEs and CEs also shows seasonal polarity reversal, a ‘CEs-AEs-CEs’ pattern from north to south in summer, but a reversed ‘AEs-CEs-AEs’ pattern in winter. Dynamic analysis showed that the vorticity of background current may affect the alternating distribution pattern of mesoscale eddies in the AS, in which positive (negative) vorticity favors CEs (AEs). The energy analysis shows that wind forcing is dominant in the eddy kinetic energy (EKE) variation, and the seasonal wind work is coherent to the EKE variation in the AS.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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