VARIATIONAL ASSIMILATION OF TAO AND XBT DATA IN THE HOPE OGCM, ADJUSTING THE SURFACE FLUXES IN THE TROPICAL OCEAN Hans Bonekamp Geert Jan van Oldenborgh Gerrit Burgers Royal Netherlands Meteorological Institute NL-3730 AE De Bilt, Netherlands. (e-mail: bonekamp@knmi.nl) Manuscript: January 11, 2001