The sensitivity of the Canadian Regional Climate Model (CRCM, developed at the "Université du Québec à Montréal") and the Gulf of St. Lawrence ocean model (GOM, developed at the "Institut Maurice-Lamontagne") to each other is tested with a series of simulations over Eastern Canada for the month of December 1989. The goal of this study is to understand the interactions between the atmosphere, the ocean and the sea-ice over the golfe of Saint-Lawrence (GSL) using these two models. The simulations have been done with an iterative, uncoupled strategy, where both models run separately and alternatively, using variables from the other model to supply the needed forcing fields. The results indicate that on a monthly time scale, the CRCM is not very sensitive to the oceanic fields from GOM, except locally over the GSL. However, GOM is quite sensitive to the small differences in atmospheric fields from the CRCM. After several iterations, the convergence of the solutions suggests that the CRCM and GOM are reaching equilibrium with respect to each other’s forcing fields.