Spatial and temporal variability of the remotely sensed chlorophyll a signal associated with Rossby waves in the South Atlantic Ocean

摘要: The present study focuses on the spatial and temporal variability of interactions between physics biogeochemistry during Rossby wave passage in South Atlantic Ocean. signature sea level anomalies (SLA) surface chlorophyll a concentration (CHLA) is analyzed using remotely sensed data from 1997 to 2006. Wavelengths 400 1100 km, with westward propagating speeds up 7.5 cm.s(-1), are observed. Using theoretical model, three processes (meridional advection concentrations, uplifting subsurface maximum, upwelling nutrients) likely explain signature. A statistical assumption allows quantifying relative importance each process. Three zones identified. Subtropical Gyre only area where contribution process reaches 20%. North south this gyre, meridional responsible for an important part (around 60%) observed signals. dominant studied phase relationships CHLA SLA gradient. seasonal shift (4 degrees) shown both sets negative At 30 degrees S-31 S, clear cycle whole period, except 2003 2004 do not follow usual cycle. These particular years can be related large scale atmospheric circulation over