Climatic variability in the vicinity of Wallis, Futuna, and Samoa islands (13°-15° S, 180°-170° W)

h-lean conditions, seasonal, and ENSO-related (El Nine Southern Oscillation) variability in the vicinity of Wallis, Futuna, and Samoa islands (13 degrees-15 degrees S, 180 degrees-170 degrees W) over the 1973-1995 period are analysed for wind pseudostress, satellite-derived and in situ precipitation, sea surface temperature (SST) and salinity (SSS), sea level, and 0-450 m temperature and geostrophic current. The mean local conditions reflect the presence of the large scale features such as the western Pacific warm pool, the South Pacific Convergence Zone (SPCZ), and the South Pacific anticyclonic gyre. The seasonal changes are closely related to the meridional migrations of the SPCZ, which passes twice a year over the region of study. During the warm phase of ENSO (El Nino), we generally observe saltier-than-average SSS (of the order of 0.4), consistent with a rainfall deficit (0.4 m yr(-1)), a hint of colder-than-average surface temperature is also identified in subsurface (0.3 degrees C), a weak tendency for westward geostrophic current anomalies (2 cm s(-1) at the surface), a sea level decrease (5-10 cm), together with easterly (5 m(2) s(-2)) and well marked southerly (10 m(2) s(-2)) wind pseudo-stress anomalies. Anomalies of similar magnitude, but of opposite sign, are detected during the cold phase of ENSO (La Nina). While these ENSO-related changes apply prior to the 1990s, they were nor observed during the 1991-1994 period, which appears atypical. (C) Elsevier, Paris/ Ifremer / Cnrs / Ird.