Agus analyses climate models and observational data to investigate modes of climate and water mass variability. Statistical data analysis techniques such as spectral, correlation analyses, empirical orthogonal functions, digital filtering, wavelets are implemented. His interests include the evolution of Southern Ocean water masses; air-sea processes in relation to the El Nino - Southern Oscillation, Indian Ocean anomalies, Antarctic Circumpolar Wave, Southern Annular Mode, and their connection to global/regional climate variability and extremes.