Investigating the Tropical Atlantic Ocean Variability from ARAMIS and Altimetry
Sabine Arnault and the ARAMIS Group(1)
LOCEAN UMR CNRS/IRD/UPMC/MNHN,
UMPC, tour 45, 5eme etage, case 100,
75252 Paris Cedex 05,
The ARAMIS program (Altimétrie sur un Rail Atlantique et Mesures In Situ) has been developed by the french IRD (Institut de Recherche pour le Développement) and CNES (Centre National d'Etudes Spatiales) organizations in order to get a long term survey of temperature, salinity and pCO2 structures in the tropical Atlantic along a merchant ship line during at least 5 years. The line crosses the major equatorial currents, the InterTropical Convergence Zone and the Atlantic regions of Maximum Salinity Water around 20°S and 30°N. The line is also interesting as it is superimposed to one of the JASON tracks. Twice a year, in March then October, when the tropical Atlantic oceanic circulation reaches its minimum/maximum intensity, temperature and salinity profiles are obtained along the ship route between 20°S and 30°N every 30' of latitude, together with other on-route acquirements.
The first 2 ARAMIS cruises, in July 2002 then March 2003 were dedicated to JASON validation in the tropical Atlantic Ocean.
During the more recent ARAMIS cruises, seawater samples have also been taken on board and ARGO floats launched.
We will present the first results of the 2002-2005 campaigns together with the altimetric Jason series in terms of surface layers dynamic investigations in the tropical Atlantic ocean.