STUDYING AND ANALYSIS OF THE POLLUTANT DISTRIBUTION TRAJECTORY FROM ETHIOPIAN VOLCANO USING HYSPLIT CODE

In this study, the atmospheric transport of airborne contaminants released from an Ethiopian volcanic eruption is investigated using the Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) model.This is done within the framework of environmental radiological dispersion, as defined by the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) and the International Atomic Energy Agency (IAEA). The evolution of plume transport from the initial release phase to long range atmospheric dispersion is characterized using forward trajectory simulations, which are equivalent to the behavior of radioactive aerosols after an unintentional or unplanned release. The analysis shows that source term characteristics, in particular buoyancy-driven plume rise and effective release height, have an impact on early plume transmission, which is in line with radiological source-term notions. Advection in the regional and synoptic-scale wind fields, vertical wind shear, and atmospheric stability are the main factors influencing atmospheric transport at later phases. The cumulative consequences of atmospheric variability and stochastic transport processes are shown in the increasing spatial dispersion and divergence of trajectories. the results validate the use of trajectory-based atmospheric transport models for evaluating the long-range dispersion, transboundary movement, and possible environmental effects of radioactive elements in the air.