The Wind-Evaporation-Sea Surface Temperature (WES) feedback is believed to play an important role in the tropics, where climate variability is governed by atmosphere-ocean coupled interactions. This dissertation reports on studies to distinctly isolate the WES feedback mechanism over tropical oceans using a modified version of an NCAR-Community Climate Model (CCM3) thermodynamically coupled to a slab ocean model, where the WES feedback is deliberately suppressed in the bulk aerodynamic formulation for surface heat fluxes. A comparison of coupled integrations using the modied WES-off CCM3 to those carried out using the standard CCM3 conclusively identifies the role of the WES feedback in enhancing the inter-annual variability over deep tropical oceans and the westward propagation of the equatorial annual cycle. An important role for near surface humidity in tropical climate variability in enhancing inter-annual variability and in sustaining the equatorial annual cycle is also suggested. Statistical analyses over the tropical Atlantic reveal that the free coupled meridional mode of the Atlantic Ocean is amplied in the presence of the WES feedback. Similar analyses of coupled model integrations, when forced with an articial El Niño Southern Oscillation (ENSO)-like SST cycle in tropical Pacic, reveal that only in the presence of the WES feedback is the meridional mode the preferred mode of response of the Atlantic to ENSO forcings. It is also found that WES feedback reinforces the tendency of the ITCZ to stay north of the equator over the Atlantic during El-Niño events. Comparative studies between Last Glacial Maximum (LGM) equivalent imposed northern hemispheric sea-ice experiments with the WES-off model and the standard model indicate a dominant role for the WES feedback in the southward shift of the ITCZ as indicated by paleo-climate records. However, it is found not to be the sole thermodynamic mechanism responsible for the propagation of high latitude cold SST anomalies to the tropics, suggesting signicant roles for other mechanisms in the tropical response to high latitude changes.