Surface ocean currents in the ocean are driven by various factors like geostrophy, sea
surface winds and near surface water buoyancy. Surface ocean currents are responsible
for transport of ocean heat, salt and related to vertical processes at the surface like
carbon dioxide absorption. Satellites like altimeters can observe the geostrophic
component of the surface currents. Surface currents synthesize as Lagrangian coherent
structures (LCS) due to coherent movement of water masses and form the skeleton of
flows over characteristic timescale of flow. Various tracer properties can be studied by
means of studying these coherent structures. Our main focus was on the determining
the robustness LCS based on Finite time Lyapunov Exponents (FTLE) (advection based
LCS) and Diffusive Barrier Strength (DBS) (diffusion based LCS) in Bay of Bengal
region based on the observed surface velocities from the satellite as well as the
numerical models. Different tracers like Sea Surface Salinity (SSS) and Sea Surface
Temperature (SST) have also been studied in relation to the LCS in Bay of Bengal.