Horizontal energy flux of wind-driven intraseasonal waves in the tropical Atlantic by a unified diagnosis

Abstract Intraseasonal waves in the tropical Atlantic Ocean have been found to carry prominent energy that affects interannual variability of zonal currents. This study investigates transfer and interaction wind-driven intraseasonal using single-layer model experiments. Three sets wind stress forcing at periods around 30 days, 50 days 80 with a realistic horizontal distribution are employed separately excite second baroclinic mode Atlantic. A unified scheme for calculating flux, previously approximated used diagnosis annual Kelvin Rossby waves, is utilized present its original form waves. Zonal velocity anomalies by dominate 80-day scenario. Meridional Yanai 30-day In 50-day scenario, two comparable magnitudes. The wave flux revealed. scenarios, zonally alternating cross-equatorial found. By checking an analytical solution excluding we confirm caused meridional transport geopotential equator. attributed combination leads asymmetric central basin. Coastally-trapped along African coast identified along-shore flux. north, bend Guinea back equatorial south, strengthened local from Angolan regions.