OISO (Océan Indien Service d'Observation) is an INSU-labelled Observation Service that brings together 3 laboratories of the IPSL (Institut Pierre Simon Laplace): LPCM, LODYC, LSCE. The objective of the programme is to study the spatio-temporal variability of the oceanic CO2 cycle, the associated air-sea exchanges in the subtropical, sub-Antarctic and southern zones, and the detection of anthropogenic CO2 in the ocean. All campaigns (2/year, one in austral summer, the other in winter) are programmed in the corresponding South-West Indian and Antarctic sector, following the repeated routes of the Marion-Dufresne (inter-ocean logistics). However, following the cancellation of the OISO-7 campaign (planned for July-August 2001), due to the presence of the Marion-Dufresne in the North Atlantic, the OISO coordinator (N. Metzl) submitted a request to the IPEV management for the valorisation of the VAL-OISO transit (OISO-07), which was accepted (with the agreement of JL Turon, DGO, UMR 5805, University of Bordeaux I) with the assurance of the participation of two LBCM staff. The objective of our request was to carry out continuous surface measurements of CO2 system parameters in the North Atlantic. The interest of this valorization was to increase the observations of CO2 in this oceanic sector, observations that were carried out in the framework of European (e.g. CAVASOO) and national (e.g. Suratlante, Gep&CO, POMME) projects. In this respect, the database created within the framework of OISO-07 complements the CDIAC database (http://cdiac.ornl.gov/ftp/oceans/OISO_line/OISO_7.data/) and the Lamont database (LDEO) from which the pCO2 climatological fields and the air-sea flux estimates are composed (Takahashi et al., 2002). We will also collaborate in completing the POMME database, notably the POMME 3 campaign conducted in September-October 2001. We also expect European collaboration on interpretations of synthesised CO2 data in the north-east Atlantic (e.g. Watson et al., Science 2009). The related programmes are International programmes IGBP/JGOFS, WCRP/CLIVAR, IGBP/SOLAS, Europe/NOCES; National programmes PROOF, PNEDC.