A wave investigation in the tropical Atlantic Ocean using satellite altimetry.
Event: 2015 Ocean Surface Topography Science Team Meeting
Session: Science III: Large scale and global change ocean processes: the ocean's role in climate
Presentation type: Type Poster
Contribution: not provided
The eddies linked to the NECC show a strong annual cycle: their number varies from ~4 per year in October to ~9 per year in March. The more powerful eddies occur in October around 40°W. Their diameter varies from 5° of longitude at 40°W to 2.5° at 60°W, and their speed is 18 cm/s. The instability waves also shows a strong seasonal cycle with maximum amplitude around August. They are generated by meridional winds at the African coast and by zonal winds at the Equator.
The Kelvin waves at the Equator are generated by zonal wind anomalies at the Equator at 30°W with a 2.6 weeks delay, and their speed is 175 cm/s (2nd order baroclinic). The speed of the Rossby waves is 50 cm/s at 5°N, and 49 cm/s at 5°S.