Tropical paleoclimate studies are extremely important in order to increase our knowledge of climate variability linked to global change and, finally, to improve climate forecasts. In this way, massive corals are excellent recorders of tropical marine climate. Geochemical proxies contained in coral skeleton are linked to environmental parameters. This work points out the great interest of multiproxy studies (stable isotopes: d18O and d13C and trace elements such as Sr/Ca, Mg/Ca, U/Ca or Ba/Ca) to understand the variability of sea surface temperature and salinity. Existing methods as well as new ones developed in the calibration phase are then employed. More than 500 years of temperature and salinity history are continuously reconstructed. They show clear decadal variations, which are essentially due to water mass currents in the southern part of New Caledonia. Strong ENSO events (El Niņo Southern Oscillation) have also been recorded circa 1600 A.D. The other study site, Wallis, has a climatology strongly linked to SPCZ (South Pacific Convergence Zone) variability. Finally, these results are summarized and a synthesis of various climate indices in the tropics is produced, taking into account these new results.