Dadou, I. I.C. GRGS/LEGOS, Isabelle.Dadou@cnes.fr
Ransau, S. S. GRGS/LEGOS,
Garçon, V. V. GRGS/LEGOS, Veronique.Garcon@cnes.fr
MESOSCALE PATTERNS IN REMOTE SENSING DATA OF THE BRAZIL-MALVINAS CONFLUENCE REGION
The highly dynamic energetic and complex area of the confluence of the Brazil and Malvinas currents acts as a large atmospheric CO2 sink in the southern ocean. This is due to different processes as the effect of the photosynthetic utilization of CO2 in the northward flowing Malvinas current waters, cooling of the southward Brazil current waters or biological/physical interactions.
We use SeaWIFS ocean color data in conjunction with Topex-Poseidon altimetric data and AVHRR sea surface temperature data to investigate, first the dominant spatial patterns in the biological and physical satellite data, secondly their spatial-temporal correlations. The wavelet method is used as it represents an excellent tool for analyzing signals in time-frequency domain. Wavelength range is larger for chlorophyll patterns (30 - 1000 km) than for sea level anomaly patterns (250-1000 km). In October and December 1997, cyclonic eddies in the Brazil current are well identified. Associated negative sea level anomaly patches (125 km) are correlated with chlorophyll patches (50 km). We studied their time evolution during a few days.
Day: Tuesday, Feb. 2
Time: 10:30 - 10:45am
Location: Sweeney Center