Investigating the Fujiwhara Effect on Seroja TC and Odette TC on Upwelling Patterns Using EMT and EPV Spatial Analysis

In the month of April, two tropical cyclones emerged in the northern Indian Ocean, exhibiting significant mutual interaction. This interaction between the two cyclones is commonly referred to as the Fujiwhara Effect, wherein the western cyclone (Odette) is absorbed by the stronger eastern cyclone (Seroja), resulting in the formation of a more potent cyclone and inducing a change in the track direction towards the south. The alterations brought about by this interaction were spatially analysed using the principles of Ekman mass transport and Ekman pumping velocity. The objective of relating these principles was to understand the dynamic interactions of water associated with tropical cyclones, particularly in the context of upwelling patterns. An observable dynamic pertains to the Transition Season 1 trade winds, which significantly alter their direction from Australia to Asia, following the track of the cyclone directed towards the Australian continent. This alteration leads to changes in the intensity patterns and the areas of upwelling and downwelling that deviate from the norm. Ekman mass transport exhibits the convergence of mass transport towards the cyclone, resulting in the emergence of upwelling zones in specific regions. Meanwhile, Ekman pumping velocity demonstrates variations in vertical water movement, indicating an increased upwelling effect associated with the cyclone. The integration of both of these parameters provides insight into the relationship between tropical cyclones and upwelling dynamics, as well as the inherent movement patterns of the cyclones themselves.