Thierry Delcroix
Directeur de Recherches
IRD (Institut de Recherche pour le Développement; ex ORSTOM)
BP A5, Centre de Nouméa, New Caledonia
tel: (687) 26 07 28 Fax: (687) 26 43 26

T. Delcroix studied Physical Oceanography at the University of Paris VI in 1980. He got his PhD thesis in Paris in 1983 and then a post-doc position at the Scripps Institution of Oceanography in La Jolla (CA, USA) during 1983-84. He presently leads the ORSTOM-ECOP group in the Physical Oceanography Laboratory in Noumea. Most of his activities are presently related to the objectives of the international CLIVAR (1995-2010) program. He has strong experience in satellite-derived and various in situ data analysis, as well as in equatorial oceanography, in particular in observing and understanding the El Niño Southern Oscillation (ENSO) event. He published significant refereed articles dealing with sea-surface salinity changes in the tropical Pacific. His group is operating a network of Volunteer Observing Ship (VOS) Thermosalinograph (TSG) measurements since 1991.

Delcroix T. and C. Hénin, 1991. Seasonal and interannual variations of sea-surface salinity in the tropical Pacific ocean. J. Geophys. Res., 96, 22135-22150.

Delcroix T., C. Hénin, V. Porte and P. Arkin, 1996. Precipitation and sea-surface salinity in the tropical Pacific. Deep Sea Res., 43, 1123-1141.

Delcroix T. and J. Picaut, 1998. Zonal displacement of western equatorial Pacific "fresh pool". J. Geophys. Res., 103, 1087-1098.

Delcroix T., 1998. Observed surface oceanic and atmospheric variability in the Tropical Pacific at seasonal and ENSO time scales: a tentative overview. J. Geophys. Res., 103, 18611-18633.

Delcroix T., L. Gourdeau and C. Hénin, 1998. Sea surface salinity changes along the Fiji-Japan shipping track during the 1996 La Niña and 1997 El Niño period. Geophys. Res. Letter, 25, 3169-3172.

Role in the SMOS mission:

The VOS TSG network is operated by the ECOP group in Nouméa since 1991, and it presently provides about 15,000 SSS observations per month in the tropical Pacific. The network consists (November 1998) in 4 lines across the Pacific warm pool, 4 round-the-world lines, and 2 regional lines, together with TAO and TRITON cruises designed to maintain the moorings in the tropical Pacific. Such a network, providing real-time SSS measurements, will be used first for validation purpose. Gaining confidence in satellite-derived SSS measurements, methods will be developed in order to merge in situ and remotely-sensed SSS data, providing large-scale SSS fields for analysing seasonal and ENSO signals. Attempts will be made to assimilate SSS data in numerical models in order to test the actual role of SSS in ENSO mechanisms, and to evaluate the impact on ENSO prediction.