Climate impacts of the basin-scale and local-scale oscillations of the Atlantic thermohaline circulation (THC) are identified by using Bergen Climate Model (BCM). The basin-wide oscillation occurs at decadal scales with strong cross-equatorial flow, the more localized fluctuation of the THC occurs mainly at interannual scales with weaker cross-equatorial flow. The basin-wide THC oscillation is associated with an intensified Azores high and Icelandic low,the local-scale THC adjustment is accompanied with a negative phase-like North Atlantic Oscillation (NAO). The atmospheric circulation change results in an intensified deep convection in the Labrador Sea in both cases. For the local-scale THC adjustment, the Irminger Sea is dominated by a weakened convection. Surface salinity anomalies in the Labrador Sea are created locally by evaporation anomalies at the sinking regions. Further analyses support that the local-scale THC oscillation is caused passively by the atmosphere forcing. There are evidences indicating that the whole THC conveyor accelerating generates the warmer sub-polar SST, which warms the air and enhances the surface evaporation.