The unique tropical storm (TS) Deliwe (2014) occurred in the northern Mozambique Channel on 17 January 2014 and turned right during its whole life cycle, moving south along the west coast of Madagascar Island. During the development of the TS, the anticyclonic eddies in the Mozambique Channel had an important influence on the intensity and track of Deliwe, which existed for months. In this study, multisource reanalysis, conductivity temperature depth (CTD) and Argo buoy data were used to investigate the mechanism of dynamics. The results showed that the anticyclonic eddies in the Mozambique Channel were a major cause of Deliwe strengthening, weakening and then deflection to the right. On 17 January, the maximum latent heat flux of anticyclonic eddy W1 reached 103.1 w/m². After Deliwe passed, the tropical cyclone heat potential (TCHP) of anticyclonic eddy W1 was significantly reduced by 3 kJ/cm². The mixed layer of anticyclonic eddy W1 was deeper than the surrounding waters, supporting the development of Deliwe. As the TS intensity decreased, the low-pressure center of 500 hPa moved above anticyclonic eddy W2, and the westerly wind belt moved northward to form a westerly trough of low pressure, which caused the TS to keep turning right and formed a unique TS track. This study provides a new understanding of the influence of marine anticyclonic eddies on the development of tropical cyclones (TCs) in the Mozambique channel.

Phytoplankton blooms occurred in the Central Indian Ocean after tropical cyclone (TC) Emeraude with an elliptic track in March 2016. Here, the ecological responses of the upper ocean layer were first researched based on remote sensing, reanalysis data and Argo data. The results show that two clockwise cyclonic eddies with a vorticity of 0.22 s–1 appeared on the southern equatorial current after the TC. Chlorophyll-a (Chl-a) blooms were found in the two eddies after the TC. The Chl-a concentration in the center of the cyclonic eddies reached 0.5 mg∙m–3. The deepened mixed layer, weakened thermocline, and thinned barrier layer facilitated the uplift of nutrients from the deep sea to the upper layer. Additionally, the sufficient photosynthetically available radiation (PAR) over the two eddies reached 50 Einstein m–2∙day–1 after March 24, thereby providing favorable conditions for the Chl-a blooms that occurred on March 26 in Box A and March 28 in Box B. This study contributes to assessments of the ecological impacts of ocean eddies in the Central Indian Ocean after TCs.